Diffractive results from CDF
|
|
- Howard McKinney
- 6 years ago
- Views:
Transcription
1 International Journal of Modern Physics A Vol. 3, No. 8 (5) 543 ( ages) c World Scientific Publishing Comany DOI:.4/S775X5438 Diffractive results from CDF Konstantin Goulianos Exerimental High Energy Physics, The Rockefeller University, 3 York Avenue, NY 65, USA dino@fnal.gov Received 3 Setember 4 Published 6 February 5 We resent a reference review of diffractive results from CDF for collisions at s = 54, 63, 8, and 96 GeV at the Tevatron, ublished in 9 PRL/PRD aers from 994 to. Both soft and hard diffractive results are included for single and/or double dissociation, central diffraction or double Pomeron exchange (where both the roton and antiroton remain intact), multi-ga diffraction (a combination of single and double dissociation), elastic scattering, and the total cross-section, which through the otical theorem is related to the imaginary art of the forward elastic scattering amlitude. In each review, we include the comarisons made by CDF with theoretical redictions. Keywords: Diffraction; CDF; Tevatron. PACS numbers:.4.nn, 3.85.Dz, t. Introduction We resent a reference review of the diffractive results ublished by the CDF Collaboration (CDF) using data collected during Tevatron Collider oerations. The order of resentation of the aers in this review does not follow the chronological order of ublication, but is rather organized by the class of hysics rocesses studied. This format has been chosen in order to rovide a better understanding of the interrelationshis between aers in the same hysics class. The review addresses the following hysics rocesses: I II III Elastic and Total Cross-Sections; Soft Diffraction; Hard Diffraction; A Single/Double Diffraction, B Hard Central Diffraction/Double Pomeron Exchange (DPE), C Raidity Gas Between Jets. 543-
2 K. Goulianos For each aer, we resent a brief descrition of the imortant findings and their hysics significance, and in most cases we include figures showing the key results. I. Elastic and total cross-sections () Measurement of small angle antiroton roton elastic scattering at s = 546 and 8 GeV (994). () Measurement of the antiroton roton total cross-section at s = 546 and 8 GeV (994). II. Soft diffraction (3) Measurement of single diffraction dissociation at s = 546 and 8 GeV (994). 3 (4) Double Diffraction Dissociation at the Fermilab Tevatron Collider (995). (5) Central Pseudoraidity Gas in Events with a Leading Antiroton at the Fermilab Tevatron Collider (3). 5 (6) Inclusive Double Pomeron Exchange at the Fermilab Tevatron Collider (4). 6 III. Hard diffraction A. Hard single/double diffraction (7) Observation of Diffractive W-Boson Production at the Fermilab Tevatron (997). 5 (8) Measurement of Diffractive Dijet Production at the Fermilab Tevatron (997). 6 (9) Observation of Diffractive b-quark Production at the Fermilab Tevatron (). 9 () Diffractive Dijets with a Leading Antiroton in bar- Collisions at s = 8 GeV (). () Observation of Diffractive J/ψ Production at the Fermilab Tevatron (). 3 () Diffractive Dijet Production at s = 63 and 8 GeV at the Fermilab Tevatron (). 4 (3) Diffractive W and Z Production at the Fermilab Tevatron (). 8 (4) Diffractive Dijet Production in Collisions at s =.96 TeV (). 9 B. Hard central diffraction/double Pomeron exchange (5) Dijet Production by Double Pomeron Exchange at the Fermilab Tevatron (). (6) Observation of Exclusive Dijet Production at the Fermilab Tevatron Collider (8)
3 Diffractive results from CDF C. Raidity gas between jets (7) Observation of Raidity Gas in Collisions at.8 TeV (995). 4 (8) Dijet Production by Color-Singlet Exchange at the Fermilab Tevatron (998). 7 (9) Events with a Raidity Ga between Jets in Collisions at s = 63 GeV (998). 8. Reference Reviews by Paer.. I () : Measurement of small angle antiroton roton elastic scattering at s = 546 and 8 GeV (994) Antiroton roton elastic scattering was measured at energies of s = 546 and 8 GeV in the range of four-momentum transfer squared.5 < t <.9 GeV. The data are well described by the exonential form e bt with a sloe b = 5.8 ±.58 (6.98 ±.5 GeV ) at s = 8 (546) GeV. The measured elastic scattering cross-sections are, resectively, σ el =.87 ±.3 and 9.7 ±.75 mb. It is recommended that this aer be read together with the aers of the antiroton roton total cross-section, I (), and single diffraction dissociation, I (3), as there are common analysis issues and cross-references among all three aers... I () : Measurement of the antiroton roton total cross-section at s = 546 and 8 GeV (994) In this aer, CDF reorts a measurement of the roton antiroton total crosssection σ T at energies of s = 546 and 8 GeV. Using the luminosity-indeendent method, values of σ T = 6.6 ±.93 mb at s = 546 GeV and 8.3 ±.4 mb at 8 GeV were obtained. In this energy range, the ratio σ el /σ T increases from. ±. to.46 ±.4. In order to understand the data analysis that led to the results resented in this aer, one should also read the aers of antiroton roton elastic scattering, I (), and single diffraction dissociation, I (3), as there are common issues and cross-references among all these three aers..3. I (3) : Measurement of single diffraction dissociation at s = 546 and 8 GeV (994) 3 Results form measurements of the diffraction dissociation differential cross-section d σ SD /dm dt for X at s = 546 and 8 GeV, M /s <, and t.4 GeV are reorted. The results are comared to theoretical redictions and to extraolations from exerimental results at lower energies. This aer should be consulted together with the aers of the measurements of the antiroton roton elastic scattering, I (), and the total cross-section, I (), as there are common data analysis issues among them, the details of which are not resented in each one aer
4 K. Goulianos.4. II (4) : Double diffraction dissociation at the Fermilab Tevatron Collider (995) Results are resented from a measurement of double diffraction dissociation in collisions at the Fermilab Tevatron collider. The roduction cross-section for events with a central seudoraidity ga of width η > 3 (overlaing η = ) is found to be 4.43 ±. (stat) ±.8 (syst) mb [3.4 ±. (stat) ±.9 (syst) mb] at s = 8 [63] GeV. The results are comared with revious measurements and with redictions based on Regge theory and factorization. Figure is a schematic diagram of the double diffraction dissociation rocess. In Fig., the total diffraction dissociation cross-sections σ DD (mb) for η > 3., extraolated from the measured regions to η > 3., are comared to the UA5 adjusted results and to Renormalized-Ga (RENORM) redictions (see cation). IP M M η min dn dη η max ln M ln M ln s η Fig.. Schematic diagram and event toology in seudoraidity sace of a double diffractive interaction. σ DD (mb) for η > 3. CDF UA5 (adjusted) Regge Renormalized ga 3 s (GeV) Fig.. The total double diffractive cross-section for ( )+ X +X versus s comared with redictions from Regge theory based on the trile-pomeron amlitude and factorization (solid curve), and from the renormalized ga robability model [K. Goulianos, arxiv:he-h/34] (dashed curve)
5 Diffractive results from CDF.5. II (5) : Central seudoraidity gas in events with a leading antiroton at the Fermilab Tevatron Collider (3) 5 The fraction of events with a large seudoraidity ga η within the seudoraidity region available to the roton dissociation roducts X in + + X is resented. For a final state of fractional momentum loss ξ and four-momentum transfer squared t within.6 < ξ <.9 and t <. [.] GeV at s = 8 [63] GeV, the fraction of events with η > 3 is found to be.46 ±. (stat) ±.4 (syst) [.84 ±. (stat) ±.43 (syst)]. They are comared with ga fractions measured in minimum bias collisions and with theoretical exectations. Figure 3 is a schematic diagram of the central seudoraidity ga rocess. In Fig. 4, the ratios of the measured cross-sections are comared to Regge and Renormalized-Ga (RENORM) redictions [K. Goulianos, arxiv:he-h/34]. IP t IP t M M η min η max ln M ln M ln/ξ ln s ln s η Fig. 3. Schematic diagram and event toology in seudoraidity sace of a SDD (single diffraction lus ga) interaction, + +GAP +M +GAP+M, with a leading outgoing antiroton of fractional momentum loss ξ, associated with a seudoraidity ga η = ln, and a ga ξ within the region of η sanned by ln s = ln s ln. ξ ga fraction η > 3. CDF: one-ga/no-ga CDF: two-ga/one-ga Regge rediction Renorm-ga rediction -ga - -ga 3 sub-energy s --, (GeV) Fig. 4. Ratios of SDD (single-diffraction lus ga) to single-diffractive rates (filled circles) and double-diffractive to total cross-sections (oen circles) as a function of the collision energy of the sub-rocess, Pomeron-roton and, resectively. The uncertainties are mainly due to systematic effects, which are highly correlated among all four data oints. The dashed lines are redictions from Regge theory and the solid lines from the renormalized ga robability model [K. Goulianos, arxiv:he-h/34]
6 K. Goulianos.6. II (6) : Inclusive double-omeron exchange at the Fermilab Tevatron Collider (4) 6 A study of the reaction + + X + Y at s = 8 GeV is resented, where is detected in a RPS and Y is a roton or roton dissociation system of masssquared MY 8 GeV. In events with a of fractional momentum loss.35 < ξ <.95 and four-momentum transfer squared t <. GeV, the fractional momentum loss ξ X of the roton or system Y, evaluated from the momenta of the articles comrising X, behaves as /ξ X at small ξ X, as exected for DPE. The fraction of events with ξ X <. is.94 ±. (stat) ±. (syst). Schematic diagrams of event toologies for SD and DPE are shown in Fig. 5, and a histogram of the measured differential event sectrum versus ξ X is dislayed and comared to Renormalized-Ga (RENORM) MC redictions in Fig. 6. dn/dη X IP X (a) X η Y IP P I Y X (b) Fig. 5. Schematic diagrams and event toologies for (a) single diffraction, + + X, and (b) DPE, + + X + Y ; the filled areas are η regions of article roduction. M X ( GeV ) Number of Events er logξ = Data DPE MC SD MC DPE+SD MC s = 8 GeV.35 ξ-.95 t-. GeV ξ X Fig. 6. Distribution of roton fractional momentum loss ξ X, measured from calorimeter and beam beam counter information, for events with a leading of.35 < ξ RPS <.95 and t <. GeV ; the curves are from a Monte Carlo simulation of SD (dotted), DPE (dashed) and total (solid) contributions normalized to the data oints; the DPE events were generated for ξ <
7 Diffractive results from CDF.7. III A (7) : Observation of diffractive W-boson roduction at the Fermilab Tevatron (997) 5 This aer reorts the first observation of diffractively roduced W bosons. In a samle of W eν events roduced in collisions at s =.8 TeV, an excess of events with a forward raidity ga is found, which is attributed to diffraction. The robability that this excess is consistent with nondiffractive roduction is. 4 (3.8σ). The relatively low fraction of W + Jet events observed within this excess imlies that mainly quarks from the omeron, which mediates diffraction, articiate in W roduction. The diffractive to nondiffractive W roduction ratio is found to be R W = (.5 ±.55)%. Quote from aer: We searched for a diffractive W signal by analyzing the correlations between the η of the electron, η e, or the sign of its charge, C e, and the multilicity of one or the other of the Beam Beam Counters (BBCs). Each event enters into two distributions, one with η e η BBC < (angle-correlated) or C e η BBC < (charge-correlated), and the other with η e η BBC > (angle-anticorrelated) or C e η BBC > (charge-anticorrelated). A doubly-correlated (anticorrelated) distribution is the BBC multilicity distribution for events with η e C e > and η e η BBC < (η e η BBC > ). The main result reorted in this aer, indicating a ga signal in the diffractive to nondiffractive event ratio, is shown in Fig R (%) ACCEPTANCE 4 6 UPPER BOUND OF BBC MULTIPLICITY.5 (a) 4 6 UPPER BOUND OF BBC MULTIPLICITY (b) Fig. 7. (a) Diffractive to nondiffractive W roduction ratio (not corrected for BBC occuancy or one-vertex cut efficiency) as a function of uer bound BBC multilicity. The solid line asses through the N B = oint, which we use as our result; (b) ga-accetance for angle-ga and charge-ga doubly correlated (solid) and anticorrelated (dashed) diffractive events with an electron within η <
8 K. Goulianos.8. III A (8) : Measurement of diffractive dijet roduction at the Fermilab Tevatron (997) 6 The observation and measurement of the rate of diffractive dijet roduction at the Fermilab Tevatron collider at s =.8 TeV is reorted. In events with two jets of E T > GeV,.8 < η < 3.5 and η η >, it is found that the diffractive to nondiffractive roduction ratio is R JJ = [.75 ±.5 (stat) ±.9 (syst)]%. By comaring this result, in combination with the measured rate for diffractive W boson roduction reorted reviously, with redictions based on a hard artonic omeron structure, the Pomeron gluon fraction is determined to be f g =.7 ±.. Figures 8 and 9 show the method of extracting the signal and the hysics significance of the results, resectively. NUMBER OF EVENTS TOWERS BBC HITS 8 Fig. 8. Beam beam counter multilicity (BBC hits) versus forward calorimeter tower multilicity in the seudoraidity regions 3. < η (BBC) < 5.9 and.4 < η (tower) < 4. oosite the dijet system.. MOMENTUM FRACTION OF HARD PARTONS IN POMERON CDF- DIJETS CDF-W UA8 ZEUS GLUON FRACTION OF HARD PARTONS IN POMERON Fig. 9. Momentum fraction versus gluon fraction of hard artons in the omeron evaluated by comaring measured diffractive rates with Monte Carlo redictions based on the standard omeron flux and assuming that only hard omeron artons articiate in the diffractive rocesses considered. Results are shown for ZEUS (dashed dotted), UA8 (dashed) and the CDF-dijet and CDF-W measurements. The CDF-W result is shown for two (dotted) or three (solid) light quark flavors in the omeron. The shaded region is used in the text to extract the quark to gluon fraction of the omeron and the standard flux discreancy factor
9 Diffractive results from CDF.9. III A (9) : Observation of diffractive b-quark roduction at the Fermilab Tevatron () 9 In this aer, CDF reorts a measurement of the fraction of b-quarks roduced diffractively in collisions at s =.8 TeV. Diffraction is identified by the absence of articles in a forward seudoraidity region. From events with an elec- < GeV within the seudoraidity region tron of transverse momentum 9.5 < e T η <., the ratio of diffractive to total b-quark roduction rates is found to be R bb = [.6 ±.9 (stat).6 (syst)]. This result is comarable in magnitude to corresonding ratios for W and dijet roduction, but significantly lower than exectations based on factorization. In Fig., it is seen that this measurement, along with the diffractive dijet 6 and W 5 roduction measurements, restricts the gluon fraction of the Pomeron to a region comatible with that of the ZEUS result determined from e collisions at HERA [M. Derrik et al., Z. Phys. C 68, 569 (995)]. The value obtained by CDF is f CDF g = D (MEASURED / PREDICTED)..8.6 ZEUS.4 CDF-b CDF-W. CDF-DIJET GLUON FRACTION IN POMERON Fig.. The ratio, D, of measured to redicted diffractive rates as a function of the gluon content of the Pomeron. The redictions are from POMPYT using the standard Pomeron flux and a hard Pomeron structure. The CDF-W curves were calculated assuming a three-flavor quark structure for the Pomeron. The black cross and shaded ellise are the best fit and σ contour of a least square two-arameter fit to the three CDF results
10 K. Goulianos.. III A () : Diffractive dijets with a leading antiroton in bar- collisions at s = 8 GeV () Results are reorted from a study of events with a leading antiroton of beam momentum fraction.95 < x F <.965 and four-momentum transfer squared t < 3 GeV roduced in collisions at s = 8 GeV at the Fermilab Tevatron collider. Aroximately % of the events contain two jets of transverse energy E jet T > 7 GeV. Using the dijet events, the diffractive structure function of the antiroton is evaluated and comared with exectations based on results obtained in diffractive dee inelastic scattering exeriments at the DESY e collider HERA. The main result resented in this aer is the measurement of the diffractive structure function F jj D (β), which is shown in Fig. along with two H measurements, H fit- and H fit-3 [T. Ahmed et al., Phys. Lett. B 348, 68 (995); C. Adloff et al., Z. Phys. C 76, 63 (997)]. F D JJ (β) H fit- H fit-3 ( Q = 75 GeV ) CDF data E Jet, T > 7 GeV.35 <ξ<.95 t <. GeV.. Fig.. Data β distribution (oints) comared with exectations from the arton densities of the roton extracted from diffractive dee inelastic scattering by the H Collaboration. The straight line is a fit to the data of the form β n. The lower (uer) boundary of the filled band reresents the data distribution obtained by using only the two leading jets (u to four jets of E T > 5 GeV) in evaluating β. The dashed (dotted) lines are exectations from the H fit (fit 3). The systematic uncertainty in the normalization of the data is ±5%. β 543-
11 Diffractive results from CDF.. III A () : Observation of diffractive J/ψ roduction at the Fermilab Tevatron () 3 In this aer, CDF reorts the first observation of diffractive j/ψ( µ + µ ) roduction in collisions at s =.8 TeV. Diffractive events are identified by their raidity ga signature. In a samle of events with two muons of transverse momentum µ T > GeV/c within the seudoraidity region η <., the ratio of diffractive to total J/ψ roduction rates is found to be R J/ψ = [.45 ±.5]%. The ratio R j/ψ (x) is resented as a function of x-bjorken. By combining it with the reviously CDF measured corresonding ratio R jj (x) for diffractive dijet roduction, a value of.59 ±.5 is extracted for the gluon fraction of the diffractive structure function of the roton. Figure shows the ratio of SD to ND events versus x-bjotken. Integrating the x bj distributions for R jj and R J/ψ in the region.4 x. (kinematic boundaries for full accetance) yields [R jj (x)/r J/ψ (x)] ex =.7±.7 (stat). The gluon fraction of the diffractive structure function of the (anti)roton is found to be fg D =.9±.4 (stat)±.6 (syst), which is consistent with the value.54±.5 obtained by combining the results of diffractive W, dijet, and b-quark roduction, as discussed in Sec..9. R ( SD / ND ) - J/ψ Data Dijet Data x min =.4 x max =ξ min = X-Bjorken Fig.. Ratios of diffractive to total J/ψ (circles) and dijet (triangles) rates er unit ξ (ξ ) as a function of x-bjorken of the struck arton of the ( ) adjacent to the raidity ga. 543-
12 K. Goulianos.. III A () : Diffractive dijet roduction at s = 63 and 8 GeV at the Fermilab Tevatron () 4 The subject of this aer is the measurement of the diffractive structure function Fjj D of the antiroton, obtained from a study of dijet events roduced in association with a leading antiroton in collisions at s = 63 GeV at the Fermilab Tevatron. The ratio of Fjj D at s = 63 GeV to Fjj D obtained from a similar measurement at s = 8 GeV is comared with exectations from QCD factorization and other theoretical redictions. Also reorted in this aer is a measurement of the ξ (x-pomeron) and β (x of arton in Pomeron) deendence of Fjj D at s = 8 GeV. In the region.35 < ξ <.95, t < GeV, and β <.5, Fjj D (β, ξ) is found to be of the form β.±. ξ.9±., which obeys β-ξ factorization. The results of this measurement are summarized in Fig. 3, which dislays on (left) the diffractive structure functions F jj D versus β at s = 53 and 8 GeV, and on (right) the ξ deendence (fractional momentum loss of the leading ) of the arameters that characterize F jj D (see figure cation). The diffractive structure functions at the two energies are similar, excet for an overall suression at s = 8 GeV relative to 6 GeV. F D jj (β) - 63 GeV 8 GeV E T Jet, > 7 GeV E T > GeV.35 <ξ<.95 t <. GeV - β n Dijet, F D jj (β, ξ) β= (a) E T Jet, > 7 GeV t <. GeV (b) Dijet 7 Inclusive ξ Inclusive, /N incl dn/dξ Fig. 3. (left) The diffractive structure function versus β, F D jj (β), integrated over the range.35 < ξ <.95 and t <. GeV and exressed er unit ξ, at s = 63 GeV (black oints) and 8 GeV (oen circles). The errors are statistical only. The lines are fits of the form β n with the arameter n common at both energies. In the fit region, the systematic uncertainty in the ratio of the 63 to 8 GeV data is +3 3 %. (right) Distributions versus ξ for 8 GeV data: (a) the arameter n of a fit to the diffractive structure function of the form Fjj D(β, ξ) ξ = Cβ n for β <.5; (b) the diffractive structure function at β =. fitted to the form Fjj D(β, ξ) β=. = Cξ m (circle-oints and curve), and the inclusive single-diffractive distribution (triangles). The errors shown are statistical. 543-
13 Diffractive results from CDF.3. III A (3) : Diffractive W and Z roduction at the Fermilab Tevatron () 8 This aer reorts measurements of the fraction of events with a W or Z boson which are roduced diffractively in collisions at s =.96 TeV. The data used are from.6 fb of integrated luminosity collected with the CDF II detector equied with a RPS that detects the from + + [X + W/Z]. It is found that (.97 ±.)% of W s and (.85 ±.)% of Zs are roduced diffractively in a region of antiroton or roton fractional momentum loss ξ of.3 < ξ <. and four-momentum transferred squared t of < t < (GeV/c). The events in which the roton scatters diffractively while the antiroton dissociates, + [X + W/Z] +, are accounted for by doubling the measured roton dissociation fraction. Also reorted in this aer are searches for W and Z roduction in DPE, + + [X + W/Z] +, and for exclusive Z roduction, + + Z +. No signal is seen above background for either one of these two rocesses. The results are comared with theoretical exectations. A schematic diagram of diffractive W and Z roduction is shown in Fig. 4. The main results are summarized in Fig. 5: on the left, the lot shows distributions of various datasets used for extracting the signal, while the lot on the right shows the W mass distribution extracted from the diffractive event samle. IP q W,Z X IP g q W,Z X Fig. 4. Diffractive W roduction: (left) through quarks, and (right) through gluons. ) number of events /( GeV/c W e/µ ν - L=.6 fb fit M =8.9 ±.7 GeV/c W diff M W (GeV/c ) Fig. 5. (left) ξ cal for W and Z events with a RPS track; the dotted histogram is the distribution of nondiffractive (ND) Z events normalized to the data Z-distribution in the region. < log ξ cal <.4. (right) Reconstructed MW diff with a Gaussian fit
14 K. Goulianos.4. III A (4) : Diffractive dijet roduction in collisions at s =.96 TeV () 9 This aer reorts results from a comrehensive study of diffractive dijet roduction in collisions at s =.96 TeV using the CDF II detector at the Fermilab Tevatron collider. A data samle from 3 b of integrated luminosity collected by triggering on a high transverse energy jet, E jet T, in coincidence with a recoil antiroton detected in a RPS is used to measure the ratio of single-diffractive to inclusive-dijet event rates as a function of x of the interacting arton in the antiroton, the Bjorken-x (x Bj ), and a Q (E jet T ) in the ranges 3 < x Bj < and < Q < 4 GeV, resectively. Results are resented for the region of momentum-loss fraction.3 < ξ <.9 and a four-momentum transfer squared t > 4 GeV. The t deendence is measured as a function of Q and x Bj and comared with that of inclusive single diffraction dissociation. Only weak x Bj and Q deendencies in the ratio of single diffractive to inclusive event rates are found, and no significant Q deendence in the diffractive t distributions. This is in effect a measurement of the diffractive structure function in collisions. The rocess is shown in Fig. 6. Secial forward detectors are used, including a RPS, and a MiniPlug calorimeter: Fig. 7. (a) (b) (c) Fig. 6. Leading order schematic diagrams and event toologies in seudoraidity (η) versus azimuthal angle (φ) for diffractive dijet roduction rocesses studied by CDF: (a) single diffraction, (b) double diffraction, and (c) DPE; the dot-filled rectangles reresent regions where article roduction occurs. CDF-II m DIPOLEs EBS QUADs QUADs EBS DIPOLEs 57m to CDF-II-center (z=) TRACKING SYSTEM CCAL PCAL MP CLC BSC RPS Fig. 7. Schematic lan view of the CDF II central (CDF-II) and forward detectors
15 Diffractive results from CDF The main results are resented in Figs. 8 and 9. Figure 8 shows that the ratio of the diffractive to nondiffractive dijet event rates, which in LO is roortional to the ratio of the resective structure functions (NLO corrections are exected to be of O(%)), varies by less than a factor of two over a Q range of 3 and Fig. 9 resents the t distribution, which is nearly indeendent of Q over a wide range of Q values. Ratio ( SD / ξ ) / ND - χ / ndf 3.3 / Const.3 ±.966 sloe.3 ± < ξ Q CAL <.9 * * jet jet <E T >, <E T >=(E T +E T )/ -3 overall syst. uncertainty: ± % (norm), ± 6% (sloe) -3 - x - Fig. 8. The ratio of diffractive to nondiffractive dijet event rates as a function of x Bj (momentum fraction of arton in the antiroton) for different values of Q ET. The quoted overall systematic uncertainty of ±% is due to the uncertainties R and r listed in Table III. 9 Bj ) - (GeV and b sloe arameters b RPS.5< ξ <.8 -t <. GeV - 3 b b 4 Q (GeV ) Corrected events er.5 GeV 4 3.5< ξ RPS <.8 RPS inclusive systematics (±3%) RPS Jet (Q ~9 GeV ) DL model t GeV Fig. 9. (left) The sloe arameters b and b of a fit to the form dσ/dt = N (A e b t +A e b t ), with A /A =. for SD events of different Q values (right) t-distributions for two samles of SD RPS track events within the region.5 < ξ RPS <.8 corrected for RPS accetance after background subtraction: (circles) RPS inclusive and (triangles) RPS Jet ( Q 9 GeV ). The curve reresents the distribution exected for soft SD in the DL (Donnachie Landshoff) model [Phys. Lett. B 58, 63 (], and references therein) normalized to the RPS data within t.5 GeV
16 K. Goulianos.5. III B (5) : Dijet roduction by double omeron exchange at the Fermilab Tevatron () This aer reorts the first observation of dijet events with a DPE toology roduced in collisions at s = 8 GeV. The events are characterized by a leading antiroton, two jets in the central seudoraidity region, and a large raidity ga on the outgoing roton side. Results are resented on jet kinematics and roduction rates, comared with corresonding results from single diffractive and inclusive dijet roduction, and tests of factorization are erformed. Process diagrams and results are resented in Figs. and, resectively. jet jet IP (a) η _ jet jet η η IP IP (b) Fig.. Illustration of event toologies in seudoraidity, η, and associated Pomeron-exchange diagrams for dijet roduction in (a) single diffraction and (b) DPE. The shaded areas on the left reresent articles not associated with the jets (underlying event). R(x) er unit ξ - - R (x) / ξ R DPE SD R SD ND.5 Jet, 7 < E T < GeV.35 <ξ- <.95. <ξ <.3 t- <. GeV -3 ξ x Fig.. Ratios of DPE to SD (SD to ND) dijet event rates er unit ξ (ξ ), shown as oen (filled) circles, as a function x-bjorken of artons in the ( ). The errors are statistical only. The SD/ND ratio has a normalization systematic uncertainty of ±%. The insert shows R(x) er unit ξ versus ξ, where the tilde over the R indicates the weighted average of the R(x) oints in the region of x within the vertical dashed lines, which mark the DPE kinematic boundary (left) and the value of x = ξ min (right)
17 Diffractive results from CDF.6. III B (6) : Observation of exclusive dijet roduction at the Fermilab Tevatron Collider (8) 7 A mini-review of this aer aears in: K. Goulianos, Central Exclusive dijet roduction at the Tevatron, Int. J. Mod. Phys. A (IJMPA), World Scientific Publishing Comany. Free access on-line ublication: htts://arxiv.org/submit/3985/view For comleteness, the abstract of the above mini-review is coied below: Abstract. We resent a reference review of central exclusive dijet roduction in collisions, where the roton and antiroton emerge intact, and only two jets of transverse energy above a certain threshold are resent in the final state. The results are ublished in two aers by the Collider Detector at Fermilab (CDF) Collaboration, a PRL () and a PRD (8), based on data collected at s =.8 TeV and.96 TeV, resectively, and a D Collaboration aer from studies at.96 TeV. In all three cases redictions for the cross-section of Higgs boson roduction are discussed, a rocess that roceeds via a similar mechanism as dijet roduction. Roman Pot Sectrometers equied with tracking detectors are used to measure the outgoing antiroton (CDF and D) and roton (D), and secial forward detectors are emloyed to hel reduce backgrounds and enrich the data in diffractive and exclusive dijet events..7. III C (7) : Observation of raidity gas in collisions at.8 TeV (995) 4 In collisions at s =.8 TeV jet events are found with a raidity ga toology. The number of hadrons in the raidity interval η D between leading-jet cones is samled by charged tracks with P T > MeV/c. An excess of trackless events beyond that exected in a smooth multilicity distribution is observed. In a control region outside η D no excess is seen. For η D >.8, the fraction of excess trackless events, consistent with estimates based on exchange of color-singlet digluons, is R(ga) = σjet(ga) σ jet =.85 ±. (stat) +.4. (syst). The signal is extracted by fitting data in the η-region between the jets (G) and the background regions that contain the jets (N), Fig.. Fig.. (left) φ versus η hase sace, and (right) (a) ga and (b) no-ga regions
18 K. Goulianos.8. III C (8) : Dijet roduction by color-singlet exchange at the Fermilab Tevatron (998) 7 This aer reorts a new measurement of dijet roduction by color-singlet exchange in collisions at s =.8 TeV at the Fermilab Tevatron. In a samle of events with two jets of transverse energy E jet T > GeV, seudoraidity in the range.8 < η jet < 3.5, and η η <, it is found that a fraction R =.3 ±. (stat) ±. (syst)% have a seudoraidity ga within η < between the jets that can be attributed to color-singlet exchange. The fraction R shows no significant deendence on E jet T or on the seudoraidity searation between the jets. The color-singlet signal is extracted using events with jets on oosite sides of the η <. region from the correlation of calorimeter towers versus tracks, as shown in Fig. 3 (left). The signal is contained mostly in the region of events with zero-tracks and less than three calorimeter towers. In Fig. 3(c), the ratio of ga to control-samle no-ga events (normalized to be unity on average) is lotted versus / of the η searation between the jets. It is seen that the ga signal becomes increasingly more dominant as η η / increases. Events Number of Tracks Number of Towers Normalized Ratio Normalized Ratio (E () T +E () T )/ (GeV) (a) (GeV) E T (3) (b) η -η / (c) Fig. 3. (left) Track versus tower multilicity distribution for events in the N vertex oositeside dijet samle with N track < 5 and N tower < within η <.. The bins with zero tracks and, or towers contain an excess of events above the exectation from an extraolation from the bins with N track >. This excess is attributed to events from color-singlet exchange. (right) Normalized (to be unity on average) ratios of ga (solid oints) and control samle events (oen circles) over all events versus: (a) the average E T of the two leading jets, (b) the E T of the third jet, and (c) half the η searation between the two leading jets
19 Diffractive results from CDF.9. III C (9) : Events with a raidity ga between jets in collisions at s = 63 GeV (998) This aer reorts a measurement of the fraction of dijet events with a raidity ga between jets roduced by a color-singlet exchange in collisions at s = 63 GeV at the Fermilab Tevatron. In events with two jets of transverse energy E jet T > 8 GeV, seudoraidity in the range.8 < η jet < 3.5, and η η <, the color-singlet exchange fraction is found to be R = [.7±.7 (stat)±.6 (syst)]%. Comarisons are made with results obtained at s = 8 GeV and with theoretical exectations. The color-singlet exchange signal is extracted by comaring the track and calorimeter tower multilicity distributions for oosite-side (OS, η η < ) dijet events, which are rich in signal, and same-side ones (SS, η η > ), which are dominated by nondiffractive events. The ratio of OS to SS events, normalized to the SS ones, is lotted in Fig. 4 versus the number of tracks (left) and towers (right). A clear signal is seen in both cases in the regions of N track > and N tower < 3, resectively. Number of Events Number of Events Number of Tracks Number of Towers (a) (b) D=(N OS -N SS )/N SS D=(N OS -N SS )/N SS Number of Tracks - Number of Towers (c) (d) Fig. 4. (to) Multilicity distributions (a) for tracks and (b) for calorimeter towers in the regions η <.9 for oosite-side (OS, η η < ) dijet events (solid lines), and η <.5 ( η <.) for tracks (towers) for same-side (SS, η η > ) dijet events (dashed lines); (bottom) the bin-by-bin difference between OS and SS events normalized to the number of SS events. The SS distribution is scaled to the OS one by the ratio of OS/SS events for N track > in (a) and N tower > in (b)
20 K. Goulianos Acknowledgments I would like to thank my CDF colleagues for their contributions that made this work ossible, and the Office of Science of the Deartment of Energy and the Rockefeller University for their generous financial suort. References. CDF Collab., (F. Abe et al.), Phys. Rev. D 5, 558 (994).. CDF Collab. (F. Abe et al.), Phys. Rev. D 5, 555 (994). 3. CDF Collab. (F. Abe et al.), Phys. Rev D 5, 5535 (994). 4. CDF Collab. (F. Abe et al.), Phys. Rev. Lett. 74, 855 (995). 5. CDF Collab. (F. Abe et al.), Phys. Rev. Lett. 78, 698 (997). 6. CDF Collab. (F. Abe et al.), Phys. Rev. Lett. 79, 636 (997). 7. CDF Collab. (F. Abe et al.), Phys. Rev. Lett. 8, 56 (998). 8. CDF Collab. (F. Abe et al.), Phys. Rev. Lett. 8, 578 (998). 9. CDF Collab. (T. Affolder et al.), Phys. Rev. Lett. 84, 3 ().. CDF Collab. (T. Affolder et al.), Phys. Rev. Lett. 84, 543 ().. CDF Collab. (T. Affolder et al.), Phys. Rev. Lett. 85, 45 ().. CDF Collab. (T. Affolder et al.), Phys. Rev. Lett. 87, 48 (). 3. CDF Collab. (T. Affolder et al.), Phys. Rev. Lett. 87, 48 (). 4. CDF Collab. (D. Acosta et al.), Phys. Rev. Lett. 88, 58 (). 5. CDF Collab. (D. Acosta et al.), Phys. Rev. Lett. 9, 8 (3). 6. CDF Collab. (D. Acosta et al.), Phys. Rev. Lett. 93, 46 (4). 7. CDF Collab. (T. Aaltonen et al.), Phys. Rev. D 77, 54 (8). 8. CDF Collab. (T. Aaltonen et al.), Phys. Rev. D 8, 4 (). 9. CDF Collab. (T. Aaltonen et al.), Phys. Rev. D 86, 39 (). 543-
Christina Mesropian The Rockefeller University
Christina Mesroian The Rockefeller University Introduction Definition of diffractive rocesses Single Diffraction Hard Single Diffraction Soft Single diffraction Double Diffraction Hard Double Diffraction
More informationHard Diffraction Results and Prospects at the Tevatron
Hard Diffraction Results and Prosects at the Tevatron University of Manchester On behalf of the CDF & DØ Collaboration ISMD 2005 14 th August, Kromeriz Tevatron Tevatron at Fermilab -collisions Run II:
More informationCDF. The Future of QCD at the Tevatron Fermilab, May The Rockefeller University. Konstantin Goulianos
Diffraction @ CDF Konstantin Goulianos The Rockefeller University The Future of QCD at the Tevatron Fermilab, - May 4 CDF Run I results Fermilab - May 4 The Future of QCD: Diffraction @CDF K. Goulianos
More informationThe Forward Detectors of CDF and DØ
The Forward Detectors of CDF and DØ Konstantin Goulianos The Rockefeller University, 123 York Avenue, New York, NY 165-9965, USA DOI: will be assigned The forward detectors of CDF II are resented with
More informationNational Accelerator Laboratory
Fermi National Accelerator Laboratory FERMILAB-Conf-98/117-E CDF Diffractive Dijet and W Production in CDF Konstantin Goulianos For the CDF Collaboration The Rockefeller University New York, New York 11
More informationDiffraction and Exclusive (Higgs?) Production
Diffraction and Exclusive (Higgs?) Production from CDF to LHC Konstantin Goulianos The Rockefeller University Les Rencontres de hysique de la Valle e d Aoste 4-10 March 007, La Thuile, Italy Recent references:
More informationPoS(DIS 2013)083. New Results on Diffractive and Exclusive Production from CDF
New Results on Diffractive and Exclusive Production from CDF The Rockefeller University E-mail: dino@rockefeller.edu We present results on central exclusive production of + in pp collisions at s = 9 and
More informationMEASUREMENT OF THE INCLUSIVE ELECTRON (POSITRON) +PROTON SCATTERING CROSS SECTION AT HIGH INELASTICITY y USING H1 DATA *
Romanian Reorts in Physics, Vol. 65, No. 2, P. 420 426, 2013 MEASUREMENT OF THE INCLUSIVE ELECTRON (POSITRON) +PROTON SCATTERING CROSS SECTION AT HIGH INELASTICITY y USING H1 DATA * IVANA PICURIC, ON BEHALF
More informationDIFFRACTIVE DIJET PRODUCTION AT CDF. Konstantin Goulianos (for the CDF II Collaboration)
DIFFRACTIVE DIJET PRODUCTION AT CDF Konstantin Goulianos (for the CDF II Collaboration) 1 CONTENTS Introduction / motivation Diffractive dijets Summary 2 STUDIES OF DIFFRACTION IN QCD Non-diffractive color-exchange
More informationThe Quark-Parton Model
The Quark-Parton Model Before uarks and gluons were generally acceted Feynman roosed that the roton was made u of oint-like constituents artons Both Bjorken Scaling and the Callan-Gross relationshi can
More informationarxiv:hep-ex/ v1 18 Jan 2007
Jet roerties from di-hadron correlations in + collisions at s= GeV Jan Rak for the PHENIX collaboration arxiv:he-ex/77v 8 Jan 7 Abstract Deartment of Physics P.O.Box 5 (YFL) Jyväskylä FI-44 University
More informationExclusive diffractive results from ATLAS, CMS, LHCb, TOTEM at the LHC
Exclusive diffractive results from ATLAS, CMS, LHCb, TOTEM at the LHC 1 Christohe Royon University of Kansas, Lawrence, USA On behalf of the ATLAS, CMS, LHCb and TOTEM collaborations 47th International
More informationarxiv: v1 [hep-ex] 30 Dec 2018
Vector Boson roduction with heavy flavor quarks with the exeriment at LHC arxiv:8.633v [he-ex] 3 Dec 8 Université Libre de Bruxelles, Brussels, Belgium E-mail: bugra.bilin@cern.ch In this aer, a brief
More informationMBR Monte Carlo Simulation in PYTHIA8
MBR Monte Carlo Simulation in PYTHIA8 Robert Ciesielski, Konstantin Goulianos The Rockefeller University, 130 York Avenue, New York, NY 10065, USA E-mail: robert.ciesielski@rockefeller.edu, dino@rockefeller.edu
More informationSoft QCD Results from ATLAS and CMS
Soft QCD Results from ALAS and Moriond, March oics Proerties of minimum bias events - transverse momentum, seudoraidity and event-by-event multilicity distributions of charged articles Underlying event
More informationMBR Monte Carlo Simulation in PYTHIA8
The Rockefeller University, 10 York Avenue, New York, NY 06, USA E-mail: robert.ciesielski@rockefeller.edu Konstantin Goulianos The Rockefeller University, 10 York Avenue, New York, NY 06, USA E-mail:
More informationLUMINOSITY DETERMINATION AT THE TEVATRON*
LUMINOSITY DETERMINATION AT THE TEVATRON* V. Paadimitriou #, Fermilab, Batavia, IL 60510, U.S.A. Abstract In this aer we discuss the luminosity determination at the Tevatron. We discuss luminosity measurements
More informationAtlas results on diffraction
Atlas results on diffraction Alessia Bruni INFN Bologna, Italy for the ATLAS collaboration Rencontres du Viet Nam 14th Workshop on Elastic and Diffractive Scattering Qui Nhon, 16/12/2011 EDS 2011 Alessia
More informationInvariant yield calculation
Chater 6 Invariant yield calculation he invariant yield of the neutral ions and η mesons er one minimum bias collision as a function of the transverse momentum is given by E d3 N d 3 = d 3 N d dydφ = d
More informationSearch for exclusive events at the Tevatron and the RP220 project in ATLAS
Search for exclusive events at the Tevatron and the RP roject in ATLAS Christohe Royon DAPNIA-SPP, CEA Saclay Worksho on diffraction at the LHC, October 8-9 7, Cracow Contents: Inclusive diffraction at
More informationOther ATLAS Jet Measurements
Other ALAS Jet Measurements Michael Begel Aril, Jets as Hard Probes Michael Begel Standard Model @ LHC ALAS Jet Measurements Aril, High dijet roduction rovides a owerful robe of the hard scatter recision
More informationPhysics at Hadron Colliders
Physics at Hadron Colliders Part 2 Standard Model Physics Test of Quantum Chromodynamics - Jet production - W/Z production - Production of Top quarks Precision measurements -W mass - Top-quark mass QCD
More informationHighlights from the ATLAS experiment
Nuclear Physics A Nuclear Physics A (28) 7 www.elsevier.com/locate/rocedia XXVIIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 28) Highlights from the ALAS exeriment
More informationResults from combined CMS-TOTEM data
Department of Physics Engineering, Hacettepe University, Ankara, Turkey The University of Iowa, Iowa City, USA E-mail: Sercan.Sen@cern.ch The combined data taking of the CMS and TOTEM experiments allows
More informationQCD at CDF. Régis Lefèvre IFAE Barcelona On behalf of the CDF Collaboration
QCD at CDF Régis Lefèvre IFAE Barcelona On behalf of the CDF Collaboration Jet Inclusive Cross-Section Underlying event studies Jet Shapes Specific processes _ W+Jets, γ + γ, γ + b/c, b-jet / bb jet Diffraction
More informationExclusive Central π+π- Production in Proton Antiproton Collisions at the CDF
Exclusive Central π+π- Production in Proton Antiproton Collisions at the CDF Maria Żurek Research Center Jülich University of Cologne on behalf of the CDF Collaboration XLV International Symposium on Multiparticle
More informationPerformance of a First-Level Muon Trigger with High Momentum Resolution Based on the ATLAS MDT Chambers for HL-LHC
Performance of a First-Level Muon rigger with High Momentum Resolution Based on the ALAS MD Chambers for HL-LHC P. Gadow, O. Kortner, S. Kortner, H. Kroha, F. Müller, R. Richter Max-Planck-Institut für
More informationBreakdown of QCD factorization in hard diffraction. Boris Kopeliovich Valparaiso
Breakdown of CD factorization in hard diffraction Boris Koeliovich Valaraiso CD factorization in diffraction e Ingelman-Schlein icture of diffraction h X It looks natural that DIS on the Pomeron robes
More informationRecent forward physics and diffraction results from CMS
Recent forward physics and diffraction results from CMS Gabor Veres (CERN) on behalf of the CMS Collaboration ISMD 2015 Conference, Wildbad Kreuth, Germany October 5th, 2015 Outline CMS: forward instrumentation
More informationProbing anomalous quartic couplings at the Large Hadron Collider with proton tagging
Probing anomalous quartic coulings at the Large Hadron Collider with roton tagging Cristian Baldenegro University of Kansas cbaldenegro@ku.edu Setember 4, 07 / Central exclusive reactions rocesses Central
More informationMeasurement of Underlying Event Observables with the ATLAS detector
Measurement of Underlying Event Observables with the ALAS detector Róbert Astaloš (Comenius University Bratislava) on behalf of the ALAS Collaboration MPI @ LHC 6 VIII International Worksho on Multile
More informationMeasurements of forward neutron and neutral pion productions with the LHCf detector
Measurements of forward neutron and neutral ion roductions with the LHCf detector Gaku Mitsuka (University of Florence, INFN Firenze, JSPS fellow) MPI4-7 Nov. 4, Krakow Outline Introduction and hysics
More informationfrom low Q (' 0:45GeV ) inclusive hotoroduction. Finally, we discuss the contribution that olarized HERA could make to the measurement of these high s
The Drell-Hearn-Gerasimov Sum-Rule at Polarized HERA S. D. Bass a, M. M. Brisudova b and A. De Roeck c a Institut fur Theoretische Kernhysik, Universitat Bonn, Nussallee 4{6, D-535 Bonn, Germany b Theoretical
More informationFactorisation in diffractive ep interactions. Alice Valkárová Charles University, Prague
Factorisation in diffractive ep interactions Alice Valkárová Charles University, Prague 8th International Workshop on Multiple Partonic Interactions at the LHC, San Cristóbal de las Casas, 2016 HERA collider
More informationarxiv: v1 [hep-ex] 5 Mar 2017
Recent CMS Results on Diffraction arxiv:703.0604v [hep-ex] 5 Mar 207 Roland Benoît on behalf of the CMS Collaboration DESY - CMS Notkestrasse 85, 22603 Hamburg Germany Abstract Recent CMS results on diffraction
More informationMeasurements of the total and inelastic pp cross section with the ATLAS detector at 8 and 13 TeV
Measurements of the total and inelastic pp cross section with the ATLAS detector at 8 and 13 TeV Motivation Measurements of the total and inelastic cross sections and their energy evolution probe the non-perturbative
More informationTim Martin - University of Birmingham
Tim Martin - University of Birmingham 1 2 Overview Modeling Inelastic Diffraction Diffractive Events in ATLAS Large Rapidity Gaps Interpreting the Data 3 pp Cross Section Double Diff. Central Exclusive
More informationarxiv: v1 [nucl-ex] 28 Sep 2009
Raidity losses in heavy-ion collisions from AGS to RHIC energies arxiv:99.546v1 [nucl-ex] 28 Se 29 1. Introduction F. C. Zhou 1,2, Z. B. Yin 1,2 and D. C. Zhou 1,2 1 Institute of Particle Physics, Huazhong
More informationHighlights of top quark measurements in hadronic final states at ATLAS
Highlights of top quark measurements in hadronic final states at ATLAS Serena Palazzo 1,2,, on behalf of the ATLAS Collaboration 1 Università della Calabria 2 INFN Cosenza Abstract. Measurements of inclusive
More informationRecent forward physics and diffraction results from CMS
EPJ Web of Conferences will be set by the publisher DOI: will be set by the publisher c Owned by the authors, published by EDP Sciences, 6 Recent forward physics and diffraction results from Gábor Veres
More informationDiffraction and rapidity gap measurements with ATLAS
Diffraction and rapidity gap measurements with On behalf of the Collaboration Institute of Physics, Academy of Sciences of the CR E-mail: vlastimil.kus@cern.ch ATL-PHYS-PROC-04-004 08/0/04 Two diffraction
More informationPomeron Intercept and Slope: are they related?
Pomeron Intercept and Slope: are they related? K. Goulianos The Rockefeller University intercept slope Small-x and Diffraction, FERMILAB, 7-3 March 007 Contents Introduction Diffraction in QCD Pomeron
More informationNational Accelerator Laboratory
Fermi National Accelerator Laboratory FERMILAB-Conf-95/244-E CDF Results on Hard Diffractive Production K. Goulianos For the CDF Collaboration Fermi National Accelerator Laboratory P.O. Box 5, Batavia,
More informationQCD Measurements at DØ
QCD Measurements at DØ University of Texas -Arlington- Seminar, University of Virginia January 24th 27 TeVatron Collider at Fermilab Proton-Antiproton Collisions at Center-of-Mass s = 1.96 TeV Two Multi-Purpose
More informationProduction of Strange Particles in Jets in Heavy-ion Collisions in ALICE
WD'3 Proceedings of Contributed Paers, Part III, 5 57, 23. IBN 978-8-737852-8 MAFYZPRE Production of trange Particles in Jets in Heavy-ion Collisions in ALICE V. učera Charles University in Prague, Faculty
More informationHadron Collider Physics, HCP2004, June 14-18
) " % "" ' & % % " ) " % '% &* ' ) * ' + " ' ) ( $#! ' "") ( * " ) +% % )( (. ' + -, '+ % &* ' ) ( 021 % # / ( * *' 5 4* 3 %( '' ' " + +% Hadron Collider Physics, HCP2004, June 14-18 The Run II DØ Detector
More informationPoS(DIFF2006)005. Inclusive diffraction in DIS H1 Results. Paul Laycock
University of Liverpool Oliver Lodge Laboratory, Department of Physics, Oxford St. Liverpool L69 7ZE, United Kingdom E-mail: laycock@mail.desy.de Results are presented of three analyses on the diffractive
More informationCentral µ + µ production via photon-photon fusion in proton-proton collisions with proton dissociation
Central µ + µ roduction via hoton-hoton fusion in roton-roton collisions with roton dissociation Institute of Nuclear Physics PAN, Kraków, Poland E-mail: wolfgang.schafer@ifj.edu.l Antoni Szczurek Institute
More informationPomeron Intercept and Slope: the QCD connection
Pomeron Intercept and Slope: the QCD connection th International Conference on Elastic and Diffractive Scattering Forward Physics and QCD K. Goulianos The Rockefeller University intercept slope th Blois
More informationRecent results on soft QCD topics from ATLAS
Recent results on soft QCD topics from ATLAS Roman Lysák Institute of Physics, Prague on behalf of the ATLAS collaboration Bormio 2016 Overview Understanding of soft-qcd interactions has direct impact
More informationResults from D0: dijet angular distributions, dijet mass cross section and dijet azimuthal decorrelations
Results from D: dijet angular distributions, dijet mass cross section and dijet azimuthal decorrelations Zdenek Hubacek Czech Technical University in Prague E-mail: zdenek.hubacek@cern.ch on behalf of
More informationDiffractive Dijet Search with Roman Pots at CDF
w C O N F C j d o g / a l b Fermi National Accelerator Laboratory / Y 4 Q O S ' 3 3 Diffractive Dijet Search with Roman Pots at CDF P.L. Melbsit For the CDF Collaboration The Rockefeller University New
More informationLight-flavour hadron production in pp and Pb Pb collisions in the ALICE experiment
EPJ Web of Conferences 60, 302 (203 DOI: 0.05/ejconf/20360302 Owned by the authors, ublished by EDP Sciences, 203 Light-flavour hadron roduction in and Pb Pb collisions in the exeriment at the LHC Francesco
More informationpp physics, RWTH, WS 2003/04, T.Hebbeker
1. PP TH 03/04 Accelerators and Detectors 1 hysics, RWTH, WS 2003/04, T.Hebbeker 2003-12-03 1. Accelerators and Detectors In the following, we concentrate on the three machines SPS, Tevatron and LHC with
More informationRecent flow results at RHIC
Recent flow results at RHIC Hiroshi Masui / University of sukuba Flow and heavy flavour worksho in high energy heavy ion collisions: GRN worksho, Inchon, Feb./24-26, 215 H. Masui / Univ. of sukuba 1 /3
More informationarxiv: v1 [hep-ex] 3 Apr 2013
Ligth-flavour identified charged-hadron roduction in and Pb Pb collisions at the LHC arxiv:4.899v [he-ex] Ar Roberto Preghenella for the ALICE Collaboration Centro Studi e Ricerche e Museo Storico della
More informationJet measurements in heavy-ion collisions with the ATLAS detector
Jet measurements in heavy-ion collisions with the detector Laura Havener, Columbia University on behalf of the Collaboration ISMD 07 laxcala City, Mexico hursday, Setember th, 07 Jets in HI collisions?
More informationMini-Bias and Underlying Event Studies at CMS
Yuan Chao Department of Physics National Taiwan University 1617 Taipei, TAIWAN 1 Introduction The Tevatron experiments provide us very good information for the quantum chromodynamics (QCD) modelings of
More informationarxiv: v1 [hep-ex] 8 Jun 2017
UCHEP 17 05 6 Aril 017 Prosects for time-deendent mixing and CP-violation measurements at Belle II arxiv:1706.0363v1 [he-ex] 8 Jun 017 Physics Deartment, University of Cincinnati, Cincinnati, Ohio 51 E-mail:
More informationCHAPTER 2 ELECTRON-PROTON COLLISION
CHAPTER ELECTRON-PROTON COLLISION.1 Electron-proton collision at HERA The collision between electron and proton at HERA is useful to obtain the kinematical values of particle diffraction and interaction
More informationStudies on the definition of inelastic Non-Single Diffractive events
Studies on the definition of inelastic Non-Single Diffractive events Armando Bermúdez Martínez Instituto Superior de Tecnologías y Ciencias Aplicadas (InSTEC), Havana, Cuba Supervisor: Hannes Jung September,
More informationMeasurement of diffractive and exclusive processes with the ATLAS detector
EPJ Web of Conferences will be set by the publisher DOI: will be set by the publisher c Owned by the authors, published by EDP Sciences, 15 Measurement of diffractive and exclusive processes with the ALAS
More informationarxiv: v1 [hep-ph] 16 Jul 2018
Jet cross sections at the LHC with NNLOJE arxiv:8.65v [he-h] 6 Jul 8 James Currie, Nigel Glover Institute for Particle Physics Phenomenology, Deartment of Physics, University of Durham, Durham, DH LE,
More informationFermilab FERMILAB-Conf-00/342-E CDF January 2001
Fermilab FERMILAB-Conf-00/342-E CDF January 2001 CDF/ANAL/JET/PUBLIC/5507 December 21, 2000 Frascati Physics Series Vol. nnn (2001), pp. 000-000 IX Int. Conf. on Calorimetry in Part. Phys. - Annecy, Oct.
More information- 08/a Accelerator Laboratory. .ITQy. September 1996
w @OAF-96 8/a Accelerator Laboratory - 97 September 1996.ITQy Presented at 1996 Annual Divisional Meeting (DPF 96)of the Division of Particles and Fields of the American Physical Society, Minneapolis,
More informationDetermining Momentum and Energy Corrections for g1c Using Kinematic Fitting
CLAS-NOTE 4-17 Determining Momentum and Energy Corrections for g1c Using Kinematic Fitting Mike Williams, Doug Alegate and Curtis A. Meyer Carnegie Mellon University June 7, 24 Abstract We have used the
More informationarxiv:hep-ph/ v1 20 Feb 1995
RU 95/E-06 Pomeron flux renormalization in soft and hard diffraction arxiv:hep-ph/9502356v1 20 Feb 1995 K. GOULIANOS The Rockefeller University 1230 York Avenue, New York, NY 10021 Submitted to Physics
More informationDiffractive production of isolated photons with the ZEUS detector at HERA
Diffractive production of isolated photons with the ZEUS detector at HERA On behalf of the ZEUS Collaboration Tel Aviv University, Tel Aviv, Israel levyaron@post.tau.ac.il The photoproduction of isolated
More information(Experimental) Soft Diffraction at LHC. Jan Kašpar. ISMD2017, Tlaxcala, Mexico 15 September, 2017
(Experimental) Soft Diffraction at LHC Jan Kašpar ISMD2017, Tlaxcala, Mexico 15 September, 2017 Introduction selected processes: Elastic scattering p + p p + p Single diffraction p + p p + X Double diffraction
More informationVery forward energy distributions and jet production observed with CASTOR in CMS
Very forward energy distributions and jet roduction observed with CASOR in Universiteit Antweren E-mail: Alex.VanSilbeeck@UAntweren.be he CASOR calorimeter at the exeriment at LHC rovides very forward
More informationTotal Inelastic Cross Section at LHC. Sara Valentinetti, INFN and Univ. of Bologna (Italy) On behalf of ATLAS and CMS
Total Inelastic Cross Section at LHC Sara Valentinetti, INFN and Univ. of Bologna (Italy) On behalf of ATLAS and CMS LC13 Workshop, ECT*, Villa Tambosi, Villazzano (TN), 16-20 Sep 2013 Outline Introduction
More informationJet energy measurement and its systematic uncertainty in proton proton collisions at s = 7 TeV with the ATLAS detector
Eur. Phys. J. C (5) 75:7 DOI.4/ejc/s5-4-9-y Regular Article - Exerimental Physics Jet energy measurement and its systematic uncertainty in roton roton collisions at s = 7 ev with the ALAS detector ALAS
More informationarxiv:hep-ph/ v1 10 Jun 1998
hep-ph/9806340 PSU/TH/200 Tests of Factorization in Diffractive Charm Production and Double Pomeron Exchange arxiv:hep-ph/9806340v1 10 Jun 1998 Lyndon Alvero, John C. Collins and J. J. Whitmore Physics
More informationPoS(DIFF2006)016. Diffraction at the Tevetron: CDF Results
Diffraction at the Tevetron: CDF Results The Rockefeller University, 30 York Avenue, New York, NY 03, USA E-mail: dino@mail.rockefeller.edu The diffractive roram of the CDF Collaboration at the Fermilab
More informationQCD Studies at LHC with the Atlas detector
QCD Studies at LHC with the Atlas detector Introduction Sebastian Eckweiler - University of Mainz (on behalf of the ATLAS Collaboration) Examples of QCD studies Minimum bias & underlying event Jet-physics
More informationQCD at the Tevatron: The Production of Jets & Photons plus Jets
QCD at the Tevatron: The Production of Jets & Photons plus Jets Mike Strauss The University of Oklahoma The Oklahoma Center for High Energy Physics for the CDF and DØD Collaborations APS 2009 Denver, Colorado
More informationSOFT QCD AT ATLAS AND CMS
SAHAL YACOOB UNIVERSITY OF CAPE TOWN ON BEHALF OF THE ATLAS AND CMS COLLABORATIONS SOFT QCD AT ATLAS AND CMS 28th Rencontres de Blois INTRODUCTION IN 15 MINUTES 2 Inelastic cross section ATLAS and CMS
More informationarxiv: v3 [hep-ph] 17 Oct 2017
Ridge Production in High-Multilicity Hadronic Ultra-Periheral Proton-Proton Collisions Stanley J. Brodsky SLAC National Accelerator Laboratory, Stanford University Stanislaw D. Glazek Faculty of Physics,
More informationAntiproton Flux and Antiproton-to-Proton Flux Ratio in Primary Cosmic Rays Measured with AMS on the Space Station
Antiroton Flux and Antiroton-to-Proton Flux Ratio in Primary Cosmic Rays Measured with AMS on the Sace Station Andreas Bachlechner on behalf of the AMS collaboration 3 07.08.017 von TeVPA 017, Columbus
More informationElastic and inelastic cross section measurements with the ATLAS detector
Elastic and inelastic cross section measurements with the ATLAS detector Simon Holm Stark Niels Bohr Institute University of Copenhagen MPI@LHC 2017 December 13, 2017, Shimla, India Outline: Physics motivation.
More informationPrecision QCD at the Tevatron. Markus Wobisch, Fermilab for the CDF and DØ Collaborations
Precision QCD at the Tevatron Markus Wobisch, Fermilab for the CDF and DØ Collaborations Fermilab Tevatron - Run II Chicago Ecm: 1.8 1.96 TeV more Bunches 6 36 Bunch Crossing 3500 396ns CDF Booster Tevatron
More informationarxiv: v1 [hep-ex] 1 Feb 2018
arxiv:8.6v [he-ex] Feb 8 MA Wigner RCP E-mail: varga-kofarago.monika@wigner.mta.hu In heavy-ion collisions, the quark gluon lasma is exected to be roduced, which is an almost erfect liquid that made u
More informationarxiv: v1 [nucl-th] 26 Aug 2011
The Viscosity of Quark-Gluon Plasma at RHIC and the LHC Ulrich Heinz, Chun Shen and Huichao Song Deartment of Physics, The Ohio State University, Columbus, Ohio 436, USA Lawrence Berkeley National Laboratory,
More informationRecent DØ results in Diffractive and Jet Physics
Recent DØ results in Diffractive and Jet Physics * Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 E-mail: odell@fnal.gov DØ measurements of the inclusive jet cross section and the
More informationPoS(EDSU2018)032. CT-PPS Physics Results and Prospects. Justin Williams. On behalf of the CMS and TOTEM Collaborations
CT-PPS Physics Results and Prosects On behalf of the CMS and TOTEM Collaborations E-mail: justinwilliams@ku.edu A unique search for hysics beyond the standard model in exclusive dihoton events is resented.
More informationarxiv: v2 [nucl-ex] 26 Nov 2014
Nuclear Physics A (8) Nuclear Physics A Baseline for the cumulants of net-roton distributions at SAR arxiv:8.9v [nucl-ex] 6 Nov Abstract Xiaofeng Luo a Bedangadas Mohanty b Nu Xu ac a Institute of Particle
More informationJet and photon production and
Jet and photon production and extraction of at HERA Radek Žlebčík1 On behalf of H1 and ZEUS collaborations 1 Deutsches Elektronen-Synchrotron (DESY) New Frontiers in Physics Kolymbari, August 24 HERA Collider
More informationStudies of the diffractive photoproduction of isolated photons at HERA
Studies of the diffractive photoproduction of isolated photons at HERA P. J. Bussey School of Physics and Astronomy University of Glasgow Glasgow, United Kingdom, G12 8QQ E-mail: peter.bussey@glasgow.ac.uk
More informationMeasurements of charm and beauty proton structure functions F2 c c and F2 b b at HERA
Measurements of charm and beauty proton structure functions F c c and F b b at HERA Vladimir Chekelian MPI for Physics, Germany E-mail: shekeln@mail.desy.de Inclusive charm and beauty production is studied
More informationarxiv: v1 [hep-ph] 12 Dec 2008
DIFFRACTION AND EXCLUSIVE (HIGGS?) PRODUCTION FROM CDF TO LHC arxiv:081.500v1 [hep-ph] 1 Dec 008 Presented at Les Rencontres de Physique de la Vallée d Aoste, La Thuile, Aosta Valley, Italy, March 4-,
More informationUsing Drell-Yan to Probe the
Using Drell-Yan to Probe the Underlying Event in Run 2 at CDF Deepak Kar University of Florida (On behalf of the CDF Collaboration) Experimental Particle Physics Seminar 30 th October 2008 Prologue: We
More informationFrigyes Nemes (Eötvös University) on behalf of the TOTEM collaboration
Frigyes Nemes (Eötvös University) on behalf of the TOTEM collaboration http://totem.web.cern.ch/totem/ Hadron Structure'13 2013, 29 June 4 July Hadron Structure'13 6/18/2013 Frigyes Nemes, TOTEM 1 Total
More informationhard-soft correlations in pa collisions
hard-soft correlations in A collisions José Guilherme Milhano CENRA-IS (Lisbon) & CERN PH-H guilherme.milhano@cern.ch Correlations and fluctuations, IN, 3rd July 05 b-deendent npdfs :: imact arameter /centrality
More informationarxiv: v1 [hep-ex] 21 Aug 2011
arxiv:18.155v1 [hep-ex] 1 Aug 011 Early Searches with Jets with the ATLAS Detector at the LHC University of Chicago, Enrico Fermi Institute E-mail: georgios.choudalakis@cern.ch We summarize the analysis
More informationTotal Cross Section, Elastic Scattering and Diffraction Dissociation at the LHC
Total Cross Section, Elastic Scattering and Diffraction Dissociation at the LHC Marco Bozzo INFN Genova and University of Genova (Italy) on behalf of the TOTEM Collaboration Overview: The experiment and
More informationStatus of diffractive models. Robert Ciesielski [The Rockefeller University]
Status of diffractive models Robert Ciesielski [The Rockefeller University] CTEQ Workshop, QCD tool for LHC Physics: From 8 to 14 TeV, what is needed and why FNAL, 14 November, 2013 1 Main processes contributing
More informationTransverse momentum and pseudorapidity distributions with minimum bias events in CMS at the LHC
Transverse momentum and pseudorapidity distributions with minimum bias events in CMS at the LHC Christof Roland/ MIT For the CMS Collaboration Rencontres de Moriond QCD Session 14 th March, 2010 Moriond
More informationMeasurements of the W Boson Mass and Trilinear Gauge Boson Couplings at the Tevatron
Measurements of the Boson Mass and Trilinear Gauge Boson Couplings at the Tevatron John Ellison University of California, Riverside, USA Selection of and Z events Measurement of the mass Tests of the gauge
More informationLecture 3: Results of jet measurements in p-p and heavy ion collisions. Brian. A Cole, Columbia University June 14, 2013
Lecture 3: Results of measurements in - and heavy ion collisions Brian. A Cole, Columbia University June 4, 3 - cross-sections @.76 ev ALAS arxiv: 34.4739 submitted to EPJC dy [b/gev]!/d d 8 6 4 5 9 6
More informationQCD and jets physics at the LHC with CMS during the first year of data taking. Pavel Demin UCL/FYNU Louvain-la-Neuve
QCD and jets physics at the LHC with CMS during the first year of data taking Pavel Demin UCL/FYNU Louvain-la-Neuve February 8, 2006 Bon appétit! February 8, 2006 Pavel Demin UCL/FYNU 1 Why this seminar?
More information