e + e - H1 Highlights for EPS03 High Q 2 Cross Sections and PDFs QCD Tests with jets and heavy flavours Low x Physics Searches for new Physics
|
|
- Cody Hunter
- 5 years ago
- Views:
Transcription
1 Multi electron Event M()=3 GeV H Highlights for EPS3 PT=63 GeV Paul Newman Birmingham University PT=6 GeV High Q Cross Sections and PDFs QCD Tests with jets and heavy flavours Low x Physics Searches for new Physics intergrated luminosity (/pb) 5 HERA luminosity e E P = 9 GeV E P = 8 GeV e H 5 days of running
2 Results to Be Shown for the First Time at a Major Conference Final high Q NC & CC xsecs / pdfs New method and data on F L at low Q F from QED-Comptons F D at high Q γp γy at high t Deeply-Virtual Compton Scattering NLO Treatment of Diffractive Final States Elastic J/ψ photoproduction High t J/ψ D photoproduction D (+ jet) in DIS will not appear b µ Photoproduction, 3-jet event shapes at high Q Dijets at low x Prompt Photons with Associated Jets Inclusive η, ρ, f, f photoproduction General Search for new Phenomena R-parity Violating SUSY (full data) Search for Superlight Gravitino Search for magnetic monopoles Multi Electron Production Contact Interactions 53 papers submitted to conference, summarising work of last years
3 High Q NC & CC Cross Sections and Fits F i x =.5, i = x =.8, i = x =.3, i = 9 H PDF extrapolation x =., i = 8 x =.3, i = 7 x =.5, i = 6 x =.8, i = 5 x =.3, i = 4 x =., i = 3 x =.3, i = x =.5, i = x =.8, i = x =.3, i = 9 x =., i = 8 x =.3, i = 7 x =.5, i = 6 H e + p high Q 94- H e + p low Q BCDMS NMC x =.8, i = 5 x =.3, i = 4 x =.8, i = 3 x =.5, i = x =.4, i = x =.65, i = Q / GeV H Collaboration xp(x) xd xu xu v xd v xg x xu xd H PDF : Q = 4 GeV Fit to H data experimental errors model uncertainties Fit to H + BCDMS data parton distribution Beautiful summary of years of high Q inclusive measurements Parton densities from H data alone! U = u + c etc x H Collaboration
4 NC Comparison between H and ZEUS F i x =.5, i = x =.8, i = x =.3, i = 9 x =., i = 8 x =.3, i = 7 x =.5, i = 6 x =.8, i = 5 x =.3, i = 4 x =., i = 3 x =.3, i = H e + p ZEUS e + p BCDMS NMC xf(x,q ) xu Q = GeV H PDF ZEUS-S PDF xu xf(x,q ) Q = GeV xu H PDF ZEUS-S PDF xu 3 x =.5, i = x =.8, i = x =.3, i = 9 x =., i = 8 x =.3, i = 7.5 xd xd.5 xd xd - - H PDF extrapolation -3 x =.5, i = 6 x =.8, i = 5 x =.3, i = 4 x =.8, i = 3 x =.5, i = x =.4, i = x =.65, i = Q / GeV H Collaboration 5 xg x 5 xg Consistency between experiments in data Reasonable consistency in pdf s x
5 Search for Contact Interactions dσ/dq / dσ SM /dq 3 e p NC data s =39 GeV 3 4 dσ/dq / dσ SM /dq 3 e + p NC data s =39 GeV 3 4 H Λ (TeV) Λ + (TeV) LL.6.8 LR RL. 3.3 RR..8 VV AA 4..5 VA 3..9 LL+RR RL+LR H 3 4 Q (GeV ) H 3 4 Q (GeV ) 5 5 ελ (TeV) H NC data consistent with Standard Model (CTEQ partons) up to highest Q Competitive limits on compositeness scales, LQ, SUSY, large extra dimensions Quark radius constrained to R q < 8 m
6 Differential -jet and 3-jet Event Shapes at high Q New differential measurements in extended Q range dσ/dτ /σ 3 H preliminary )+NLL+PC NLO( α s jet shapes: τ B τ C C ρ 3 jet shapes: K out /Q χ Jet rates: y kt y3 kt y4 kt - jet shapes: Fits using NLO QCD new - resummed calculations power corrections e.g. τ = Thrust -3-4 <Q>= 5 GeV <Q>= 8 GeV <Q>= 4 GeV <Q>= 37 GeV <Q>= 58 GeV <Q>= 8 GeV <Q>=6 GeV..5. τ
7 Impact of New Measurements 95- data, resummed, fit distributions data, non-resummed, fit means α (µ I = GeV).6.55 τ c H preliminary B C )+NLL+PC Fits NLO( α s stat. and exp. syst. errors Q >GeV α _ (µ Ι = GeV).7.6 Power Correction Fits (stat. and exp. syst. uncertainties) ρ ρ τ world average...3 α s (m Z ) More consistent picture results for α s and H B τ τ c C α s (M Z ) power correction parameter α
8 e e' D Photoproduction γ ( ) D data in tagged γp... Testing MC models and NLO theory p g [nb] dσ(ep D* X)/dη 4.5 H 99- (prel.) 4 NLO QCD: 3-flavour massive flavour massless [nb/gev] dσ(ep D* X)/dpt - - H 99- (prel.) NLO QCD: 3-flavour massive FONLL ( matched ) η (D*) pt (D*) [GeV] Not fully described by MC models or massive theory Massless, Matched FONLL better? Important data to constrain large theory uncertainties
9 D + Dijets in DIS dσ(ep ed*jjx)/de max t [nb GeV - ] H preliminary H D*+jj (prelim.) RAPGAP dir RAPGAP dir+res CASCADE E max t [GeV] σ(d * jjx) [nb] H preliminary H D * CASCADE ε=. CASCADE ε=.78 CASCADE ε=.35 RAPGAP dir.+res. RAPGAP dir. HERWIG AROMA σ(d * X) [nb] DIS Results for Inclusive D and D + dijets New insights with jet requirements LO MC models describe inclusive data well, but dijets bring sensitivity to extra effects
10 σ(ep eb bx ejjµx) in γp H Preliminary H Preliminary Events H Data (Prel.) Pythia bb Pythia cc Pythia uds Sum Events H Data (Prel.) Pythia bb Pythia cc Pythia uds Sum Impact Parameter δ [ cm ] 3 p rel t [ GeV ] Measure b cross sections for dijet events with muon associated with one jet Two observables to separate b, c and background Simultaneous D fit ) Track impact parameter δ from Silicon ) p rel (µ jet) T
11 Beauty Photoproduction Cross Sections dσ/dη µ [pb] 6 dσ/dη µ (ep ebb X ejjµx) Q < GeV. < y <.8 p µ t >.5 GeV p jet t > 7(6) GeV η jet <.5 H Data ZEUS Data NLO QCD Had dσ/dp µ t [pb/gev] dσ/dp µ t (ep ebb X ejjµx) Data H Preliminary NLO QCD Had NLO QCD 4 Q < GeV ;. < y <.8 p jet t > 7(6) GeV; η jet < < η µ < η µ p µ t [GeV] H and ZEUS in good agreement Comparisons with NLO QCD (fixed order massive) σ(ep eb bx ejjµx) : Data / NLO.8 (.5σ) for measured range Discrepancy increases as p T decreases...
12 Dijet Production at Low x γ x x g Q Jet s^ Jet Jet φ <α π Jet Azimuthal decorrelation between jets in γ p CMS sensitive to higher order effects, incoming k T Measure S = Pr ( leading jets have φ < ) Mostly well described by NLO 3-jet theory Still missing contributions at lowest x, Q!...
13 Determination of F L at Low Q F L is the ideal observable to study the low x gluon F L at low Q (MRST) - huge changes from LO, NLO, (NNLO) H Collaboration F L (x,q ) Q = GeV NNLO (average) NNLO (extremes) NLO LO Sensitivity at highest y (E e > 3 GeV) New data at lowest Q from SV run. New method introduced: Fit σ r at fixed Q : σ r = c x λ y /Y + F L
14 F L at Low Q But models that can get the Q dependence right can still be wrong No substitute for measuring x dependence... H Collaboration H F L determination now spans 3 orders of magnitude in Q Distinguishes between models!
15 QCD Hard Scattering Factorisation for Semi-Inclusive DIS Hard scattering factorisation established for diffractive DIS Diffractive parton densities extracted from H diffractive data with 6.5 < Q < 9 GeV β z Σ(z,Q ).. Singlet H σ r D NLO QCD Fit z g(z,q ) H preliminary Gluon Q [GeV ] 6.5 γ q q g (z) IP (-z) p p Test partons at higher Q and in final state data z H σ r D NLO QCD Fit (exp. error) (exp.+theor. error) H σ r D LO QCD Fit z 5 9
16 x IP σ r D(3) H 99 ( s=39 GeV, prel.) H 99- ( s=39 GeV, prel.) H 97 ( s=3 GeV, prel.) H preliminary H σ r D NLO QCD fit (prel.) extrapol. fit β=. β=.4 β=. β=. β=.4 β=.65 β=.9 Q [GeV ] x IP σ r D(3).5.5 Diffractive DIS at High Q x IP =.3 x=.3, β=.7 x=.5, β=.67 H preliminary x=.5, β=.667 x=.8, β=.667 H F D data now cover 4 orders of magnitude in Q x=.8, β=.67 x=.3, β=.433 x=., β=.667 x=.3, β=.67 3 Q [GeV ] x=.3, β=.4333 x=., β= Q [GeV ] H 97 ( s=3 GeV, prel.) H 99- ( s=39 GeV, prel.) H σ r D NLO QCD fit ( s=39 GeV, prel.) IP only extrapol. fit QCD fit to medium Q data for diffractive parton densities describes data well. new x IP
17 NLO treatment of diffractive final states γ q Calculations for previous H data using diffractive DISENT and HVQDIS. g (z) q [pb] dσ / dz IP (jets) 6 4 H Diffractive Dijets (prel.) H fit, µ r =p T, µ f =4 GeV H Data p T,() >5(4) GeV DDISENT NLO *(+δ had. ) DDISENT NLO DDISENT LO dσ / dz IP [pb] 8 6 H Diffractive D * (prel.) H fit, µ =Q +4m c H Data DHVQDIS NLO DHVQDIS LO p IP (-z) p Description 4 beyond LO+PS z IP (jets) z IP Low scales... large scale and hadronisation uncertainties Data well described Consistent description of diffractive DIS Diffractive hard scattering factorisation works!
18 γ Diffractive J/ψ µ + µ Photoproduction Elastic J/ψ µ + µ at low t... dσ/dt (W ) α(t) H: γp J/ψp H: γp J/ψp σ γp J/ψp [nb] 5 75 H 99- J/ψ µ + µ - (prelim.) H J/ψ e + e - (BR corr.) ZEUS E4 α P (t).6.4 H 99- J/ψ µ + µ - (prelim.) ZEUS 5 E FMS (CTEQ4L, λ=4) MRT (CTEQ5M) MRT (MRST99) W [GeV].8.6 Fit: α +α t α =.±. α = (.5±.6) GeV t [GeV ] Hard energy dependence σ W.7±.8 Some shrinkage: α =.5 ±.6 GeV
19 High t Diffractive J/ψ Photoproduction dσ(γp J/ψY)/dt [nb/gev ] - Data H BFKL LL (fixed α s ) BFKL LL + NL (fixed α s ) BFKL LL + NL (running α s ) DGLAP LL α IP (t).6.4. H γp J/Ψ p (prelim.) H γp J/Ψ Y (prelim.) ZEUS γp J/Ψ p α IP (t)=. -.5 GeV - t α IP (t)=.7 +. GeV - t α IP (t)=. -. GeV - t 3 t [GeV ] - t [GeV ] Unprecedented t range for VM BFKL and DGLAP models describe most aspects of data Trajectory incompatible with low t elastic J/ψ Evidence for new low x dynamics?
20 Diffractive Photoproduction of Photons at high t e γ e γ X p Y First observation of new process Lower statistics than high t J/ψ, but no uncertainty due to VM wavefunction Data reasonably described by LL BFKL model with reasonable ᾱ s
21 Deeply Virtual Compton Scattering e p γ * e e γ p New measurement higher Q p γ * e p γ σ (γ * p γp) [nb] Leading twist NLO calculation using GPDs (Freund, McDermott) Data described with dσ/dt e bt, b = 7[.5 log(q /)] GeV parameterised from ρ data Sensitivity to choice of GPD σ (γ * p γp) [nb] W [GeV] - HERA measurements consistent Q [GeV ]
22 F at High x, but Low Q k l l l k P q = l - l - k P q = l - l - k l X X Use QED-Compton events and new models for the low W region events / pb - 5 H preliminary H QEDC 997 COMPTON + bg Backgrounds 5 5 F F.5.4 Q =.5 GeV x.5 Q = 7 GeV x F Q = GeV x H QEDC 97 prel E665 H SV prel NMC H 99 prel SLAC ZEUS BPT ALLM97 Fractal log y Σ
23 e + d λ j ~ j u L u, d χ ~ + α, g, χ β χ e q q ( ν e q q ) Search for q in R p Supersymmetry e.g. e + d ũ L... e.g. e u d R... χ + q, l + Searches for squarks in R P viol. SUSY Searches for squarks in R P viol. SUSY (b) W + q, ν l λ, j Unconstrained MSSM, j=, λ, k Unconstrained MSSM, k=, Study several leptons + jets channels No significant deviations from - - e + + d c (APV) EXCLUDED IN PART OF PARAM. SPACE EXCLUDED tan β = -3 < µ < 3 GeV 7 < M < 35 GeV M LSP > 3 GeV imposed - - EXCLUDED IN PART OF PARAM. SPACE EXCLUDED λ, (CCU) tan β = -3 < µ < 3 GeV 7 < M < 35 GeV M LSP > 3 GeV imposed expectations e + + d u (ββν) H preliminary λ, (ββν) H preliminary M squark (GeV) M squark (GeV) m q < 75 GeV excluded in large part of parameter space for λ of electromagnetic strength
24 Search for Superlight Gravitino e + d χ ẽ u j γ G m e ~ (GeV) 4 H e + p preliminary theoretically inaccessible λ, j =.5 λ j If G is LSSP, produce χ via R p t-channel exchange of ẽ. Signature γ + p miss T Then χ Gγ 8 6 λ, j =.5 λ, j =. χ not NLSP GMSB, j=, tanβ =.5, µ <, N = Limits set in GMSB scenario m x (GeV)
25 General Search for New Physics Events How compatible is H data with the Standard Model overall? j j e j µ j j ν e ν e e e µ µ µ j γ e γ ν γ γ γ j j j e j j j j ν e e j e j ν µ j ν j j γ e j γ j ν γ e j j j j j j ν j j j j e j j j j 3 H General Search 4 H Data (prelim.) SM Investigation of all multi-object final states with j, e, µ, γ, p miss T... isolated... p T > GeV... < θ < 4 3+ channels!... Compare with Standard Model up to O(α s )+PS in QCD (many MC s!) Impressive agreement for most channels
26 Differential Analysis in Σp T Novel statistical algorithm to quantify level of agreement... For each channel, scan all possible connected regions in Σp T find most significant deviation and M all to Use MC experiments to determine probability ˆP of finding a more significant excess somewhere in distribution Events and M all H Data (prelim.) SM Region µ - j - ν Σ P T (GeV) Event MUON- Most significant effect from Σp T scan for µjν events... Corresponds to already reported isolated leptons with missing p T channel GeV GeV GeV H
27 Overall Compatibility with Standard Model Probability of isolated lepton excess at high p T was estimated at 3 Probability that one of the 3 studied channels would give a more significant excess in Σp T % For M all analysis, 5% probability for larger excess... Analysis confirms existing excess No new deviations found Number of Event Classes Number of Event Classes H Data (prelim.) H General Search -- results Σ P T MC Experiments µ - j - ν H General Search -- M all results H Data (prelim.) MC Experiments µ - j - ν -log P log P
28 Summary Many new H results for EPS3 - HERA-I analysis still going strong! Final HERA-I results in many areas Old topics revisited with improved precision Extended kinematic range Several new and completely original topics Significant contributions to several areas of our field Competitive sensitivity to new physics Improved parton densities and tests of QCD Unique constraints on low x Physics Thanks and Congratulations to all in H who worked on the new data!
ZEUS Highlights for ICHEP02... a personal selection
Highlights for ICHEP... a personal selection Main Questions at HERA: Tancredi.Carli@desy.de What is the structure of the proton? Is DGLAP working at low-x? How are heavy quarks produced? Is the SM valid
More informationQCD Measurements at HERA
QCD Measurements at HERA Armen Bunyatyan, Max-Planck-Institut für Kernphysik, Heidelberg, Germany Yerevan Physics Institute, Armenia November, 7 Abstract A review is presented of recent results in QCD
More informationPhysics at HERA. Summer Student Lectures August Katja Krüger Kirchhoff Institut für Physik H1 Collaboration
Physics at HERA Summer Student Lectures 18 + 19 August 28 Kirchhoff Institut für Physik H1 Collaboration email: katja.krueger@desy.de Overview Part 2 Exotics Jet Physics Cross Sections Strong Coupling
More informationF c 2 measurements at HERA. Katerina Lipka
F c measurements at HERA Katerina Lipka New trends in HERA Physics, Ringberg 8 Charm production at HERA: why now? HERA I : PDF central measurement of HERA HERA I F c / F Q = GeV PDF obtained from the fits
More informationZEUS results for EPS-HEP combined ZEUS+H1 result
results for EPS-HEP 7 + combined +H result Universität Hamburg on behalf of the (and H) Collaborations DESY seminar July 7, 7 July 7, 7 Results released after ICHEP 6 Hadronic final states Forward Dijets
More informationElectroweak Physics and Searches for New Physics at HERA
Electroweak Physics and Searches for New Physics at HERA Uwe Schneekloth DESY On behalf of the H1 and ZEUS Collaborations 14th Lomonosov Conference on Elementary Particle Physics 5.08.009 Outline Introduction
More informationFuture exotic physics at ZEUS and HERA
Future exotic physics at ZEUS and HERA Matthew Wing (UCL) Introduction Inclusive measurements of deep inelastic scattering Deviations from the Standard Model and search for substructure Search for leptoquarks
More informationOutline: Introduction Quantum ChromoDynamics (QCD) Jet algorithms Tests of QCD QCD analyses at HERA extraction of the proton PDFs
Outline: Introduction Quantum ChromoDynamics (QCD) Jet algorithms Tests of QCD QCD analyses at HERA etraction of the proton PDFs Etraction of the proton PDFs Etraction Etractionof of the proton protonpdfs
More information4th Particle Physcis Workshop. National Center for Physics, Islamabad. Proton Structure and QCD tests at HERA. Jan Olsson, DESY.
th 4 Particle Physics Workshop National Center for Physics, Islamabad Proton Structure and QCD tests at HERA Part 2 The proton structure function F2 NLO QCD describes data over >4 orders of magnitude in
More informationResults on the proton structure from HERA
Results on the proton structure from HERA Shima Shimizu (CERN) 7/Jan/ @ KEK The world only e-p collider: HERA electron proton A unique collider at DESY, Hamburg H ZEUS Circumference: 6.3 km Operated since
More informationDiffractive Dijet and D* Production at HERA
Diffractive Dijet and D* Production at HERA XVIIth Recontre de Blois XIth International Conference on Elastic and Diffractive Scattering towards High Energy Frontiers Château de Blois, France 2/22 June
More informationLimits on the effective quark radius and the contact-interaction mass scales from inclusive ep scattering at HERA. Aleksander Filip Żarnecki
38th International Conference on High Energy Physics August 5, 2016 A.F.Żarnecki (University of Warsaw) Quark radius and CI at HERA August 5, 2016 1 / 24 Limits on the effective uark radius and the contact-interaction
More informationJets and Diffraction Results from HERA
Jets and Diffraction Results from HERA A. Buniatyan DESY, Notkestrasse 5, 7 Hamburg, Germany for the H and ZEUS Collaborations he latest results on precision measurements of jet and diffractive cross sections
More informationStructure Functions and Parton Distribution Functions at the HERA ep Collider
Structure Functions and Parton Distribution Functions at the HERA ep Collider by Chris Targett Adams (University College London) on behalf of the ZEUS and H1 collaborations. Moriond QCD, 16/03/2005 Contents
More informationLHC Collider Phenomenology
LHC Collider Phenomenology Theorist! You are a theorist working in the CMS experimental collaboration You work on LHC Collider Phenomenology related to CMS By working in the experimental collaboration
More informationPhysics and Physics prospects at HERA
Physics and Physics prospects at HERA 58 th Extended Scientific Council / 130 th Scientific Council 1/ June 004 Yuji Yamazaki (KEK, ZEUS) On behalf of the H1, ZEUS, HERMES and HERA-B collaborations The
More informationBeauty Production with the ZEUS HERA II Data
Outline Introduction Beauty Production with the HERA II Data Oliver Maria Kind On Behalf of the Collaboration Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn XIV International
More informationHadronic structure, low x physics and diffraction
Hadronic structure, low x physics and diffraction P. Marage Université Libre de Bruxelles - CP 3, Boulevard du Triomphe, B-5 Bruxelles, Belgium E-mail: pmarage@ulb.ac.be Abstract A review is presented
More informationProton Structure Functions: Experiments, Models and Uncertainties.
Proton Structure Functions: Experiments, Models and Uncertainties. S. Glazov, DESY IKTP seminar, July 8. Disclaimer Nothing in this talk should be interpreted as the final knowledge on proton structure.
More informationPDF Studies at LHCb! Simone Bifani. On behalf of the LHCb collaboration. University of Birmingham (UK)
PDF Studies at LHCb! Simone Bifani University of Birmingham (UK) On behalf of the LHCb collaboration MENU 213 Rome 3th September - 4th October 213 Outline Introduction Analyses» Z/γ* ll, l =, e, τ#» W
More informationInclusive Cross Sections at HERA and Determinations of F L
Inclusive Cross Sections at HERA and Determinations of F L Vladimir Chekelian (MPI for Physics, Munich) on behalf of the H and ZEUS Collaborations HERA The World s Only ep Collider HERA / DIS / NC / CC
More informationHeavy Flavour physics at HERA
A taste of Heavy Flavour physics at HERA Luis Labarga (University Autonoma Madrid), on behalf of OUTLINE: the H1 and ZEUS Collaborations - Basics of HERA and HF production at HERA - Current theoretical
More informationResults on the proton structure from HERA
Results on the proton structure from HERA Shima Shimizu (Univ. of Tokyo) Introduction HERA physics Proton structure The world only e-p collider: HERA electron proton A unique collider at DESY, Hamburg
More informationNovel Measurements of Proton Structure at HERA
Introduction Combined Cross Sections & QCD Fits NC & CC Cross Section Measurements F L Summary Novel Measurements of Proton Structure at HERA Katie Oliver University of Oxford On behalf of the H1 and ZEUS
More informationRecent Results on Jet Physics and α s
Recent Results on Jet Physics and α s XXI Physics in Collision Conference Seoul, Korea June 8, Presented by Michael Strauss The University of Oklahoma Outline Introduction and Experimental Considerations
More information, 2004 Peter Schleper University of Hamburg Strasbourg, March 12 HC: The decade of Hadron machines L evatron HERA
HERA Tevatron LHC: The decade of Hadron machines University of Hamburg Strasbourg, March 12 th, 2004 1 LHC: Proton-Proton E CMS = 14 TeV HERA LHC: HERA: Elektron-Proton E CMS = 320 GeV 2 Perturbative approach
More informationHard QCD and Hadronic Final State at HERA. Alice Valkárová, on behalf of H1 and ZEUS Collaborations
Hard QCD and Hadronic Final State at HERA Alice Valkárová, on behalf of H1 and ZEUS Collaborations Diffraction 2016, Acireale, Sicily 4.9.2016 HERA collider experiments 27.5 GeV electrons/positrons on
More informationStudy of Inclusive Jets Production in ep Interactions at HERA
HEP 003 Europhysics Conference in Aachen, Germany Study of Inclusive Jets Production in ep Interactions at HERA Mónica Luisa Vázquez Acosta Universidad Autónoma de Madrid On behalf of the ZEUS & H1 Collaborations
More informationZEUS physics results for summer 2013
ZEUS physics results for summer 2013 Misha Lisovyi (DESY) on behalf of the ZEUS and H1 Collaborations HERA Forum 18.06.2013 HERA physics p HERA physics: Structure functions and electro weak effects QCD
More informationBeauty contribution to the proton structure function and charm results
and charm results Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati E-mail: andrea.longhin@lnf.infn.it Recent heavy quark production results in deep inelastic scattering and photoproduction
More informationMultijet in Neutral Current Deep Inelastic Scattering
Multijet in Neutral Current Deep Inelastic Scattering ZEUS Collaboration Meeting June 24, 2004 Liang Li University of Wisconsin Nils Krumnack Hamburg University Multijet Study, L.Li (U. Wisconsin, N.Krumnack
More informationA M Cooper-Sarkar on behalf of ZEUS and H1 collaborations
α s (M Z ) and charm quark mass determination from HERA data International Workshop Determining the Fundamental Parameters of QCD IAS Singapore March 2013 A M Cooper-Sarkar on behalf of ZEUS and H1 collaborations
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 informationProton Structure Function Measurements from HERA
Proton Structure Function Measurements from HERA Jörg Gayler DESY, Notkestrasse 85, 2263 Hamburg, Germany E-mail: gayler@mail.desy.de Abstract. Measurements of proton structure functions made in neutral
More informationRicerca di nuova fisica a HERA
Ricerca di nuova fisica a HERA Incontro sulla Fisica delle Alte Energie, Lecce 23-26 aprile 2003 S.Dusini, INFN Padova 1 Overview Introduction to Hera Results from HERA I Contact Interaction: Compositness,
More informationQCD Results from HERA
QCD Results from HERA Daniel Britzger for the H1 and ZEUS Collaborations La Thuile, Italy 30.03.2017 1 Deep-inelastic ep scattering Neutral current scattering (NC) ep e'x Covered topics in this talk e'(k')
More informationDiffractive PDF fits and factorisation tests at HERA
Diffractive PDF fits and factorisation tests at HERA A.Solano Univ. of Torino and INFN On behalf of the H1 and ZEUS Collaborations DIFFRACTION 010 Outline: Introduction QCD analysis of ZEUS diffractive
More informationOutline. Heavy elementary particles. HERA Beauty quark production at HERA LHC. Top quark production at LHC Summary & conclusions
Outline Heavy elementary particles HERA Beauty quark production at HERA LHC Charm, beauty (bottom) and truth (top) Status and plans Top quark production at LHC Summary & conclusions 2 Elementary Particles
More informationBeauty jet production at HERA with ZEUS
DESY and University of Hamburg E-mail: mlisovyi@mail.desy.de wo recent measurements of beauty production in deep inelastic ep scattering with the detector are presented. In the first analysis, beauty production
More informationCharm and Beauty Structure of the proton
International Conference Heavy Quarks and Leptons München, 16-20 October 2006 Riccardo Brugnera Padova University and INFN on behalf of the H1 and ZEUS Collaborations Charm and Beauty Structure of the
More informationExclusive VM electroproduction
Exclusive VM electroproduction γ * p V p V γ ρ ϕ ψ =,,, J /, ϒ Aharon Levy Tel Aviv University on behalf of the H and collaborations June, 28 A. Levy: Exclusive VM, GPD8, Trento Why are we measuring σ
More informationResults on QCD and Heavy Flavors Production at the Tevatron
Results on QCD and Heavy Flavors Production at the Tevatron Donatella Lucchesi INFN and University of Padova October 21 Padova Outline: Machine and detector description Latest results on QCD Heavy Flavor:
More informationMeasurement of F L at HERA. S. Glazov, DESY, Ringberg 2008
Measurement of F L at HERA S. Glazov, DESY, Ringberg 8 DIS kinematics Kinematics of inclusive scattering is determined by and Bjorken x. In x scale parameter / - equal sharing among quarks. Proton structure
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 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 informationTesting QCD at the LHC and the Implications of HERA DIS 2004
Testing QCD at the LHC and the Implications of HERA DIS 2004 Jon Butterworth Impact of the LHC on QCD Impact of QCD (and HERA data) at the LHC Impact of the LHC on QCD The LHC will have something to say
More informationZEUS New Results. Wesley H. Smith, University of Wisconsin on behalf of the ZEUS Collaboration DIS 2004, Strbské Pleso, Slovakia, April 14, 2004
ZEUS New Results Wesley H. Smith, University of Wisconsin on behalf of the ZEUS Collaboration DIS 2004, Strbské Pleso, Slovakia, April 14, 2004 HERA I: Structure Functions & QCD fits Hadronic Final States
More informationForward Jets with the CAL
Forward Jets with the CAL Sabine Lammers Juan Terron March 4, 004 ZEUS Collaboration Meeting Motivation Event Selection Monte Carlo Programs Forward Jet Measurements Summary and Plans Parton Evolution
More informationMulti Lepton events at HERA
St. Petersburg, 25/04/2003 DIS03 Conference Multi Lepton events at HERA Andrea Parenti (on behalf of H and ZEUS Collabs.) Padova University and INFN A.Parenti - Multi Lepton Events at HERA p./?? Outline
More informationSearch for New Physics at HERA
Search for New Physics at HERA Andrea Parenti (DESY) for the H and ZEUS collaborations CIPANP 009 S. Diego, 8/05/009 Outline Introduction to HERA Model dependent searches Quark radius Excited fermions
More informationSearch for New Physics at HERA
Search for New Physics at HERA Yongdok Ri (KEK) on behalf of the H and ZEUS collaborations Introduction of HERA Model dependent search Model independent search Summary LES RENCONTRES DE PHYSIQUE DE LA
More informationDiffractive rho and phi production in DIS at HERA
Xavier Janssen, on behalf of H and Collaborations. Université Libre de Bruxelles, Belgium. E-mail: xjanssen@ulb.ac.be These proceedings report on H and results on diffractive electroproduction of ρ and
More informationRunning Period. Detector Progress Data Analysis. Background Studies Physics Results Highlights Physics Outlook and Goals
Status Report -3 Running Period Detector Progress Data Analysis Background Studies Physics Results Highlights Physics Outlook and Goals Stathes Paganis Columbia University On behalf of the Collaboration
More informationDiffractive Structure Functions from the H1 and ZEUS Experiments at HERA
Diffractive Structure Functions from the H and Experiments at HERA SINP MSU Irina A. Korhavina (Moscow State University) On Behalf of the H and Collaborations O U T L I N E : Diffraction σ D r from LRG
More informationSearches for new Physics at HERA
Peter Schleper, Hamburg University LHC 2008 Searches at HERA 1 Searches for new Physics at HERA HERA data & experiments Model independent Search Single top & lepton + P T,miss Supersymmetry Contact Interactions
More informationW/Z inclusive measurements in ATLAS
/Z inclusive measurements in J-B. Blanchard On behalf of the Atlas collaboration Standard Model @ LHC 1-1/4/1 Introduction /Z physics at the LHC LHC: a /Z factory... heoretically well understood bosons,
More informationStudies of Beauty at H1 and ZEUS
Studies of QCD and High Energy Hadronic Interactions March 12th 19th 2005 XXXXth Rencontres de Moriond I. Bloch, DESY Hamburg / Hamburg University Introduction & Theory Measurement methods & Results: gp
More informationStructure Functions at Very High Q 2 From HERA
Structure Functions at Very High Q 2 From HERA Christopher M. Cormack For the H1 and ZEUS Collaborations Rutherford Appleton Laboratory, Chilton, Didcot, Oxford, OX11 0QX, United Kingdom Abstract. Measurements
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 informationAchim Geiser, DESY Hamburg. Inclusive Deep Inelastic Scattering Jets and Heavy Flavours in DIS Exclusive dipion electroproduction
Deep Inelastic Scattering and dipion electroproduction at HERA Achim Geiser, DESY Hamburg EDS Blois workshop Qui Nhon, Vietnam, 2011 Inclusive Deep Inelastic Scattering Jets and Heavy Flavours in DIS Exclusive
More informationPoS(DIS 2010)071. Diffractive electroproduction of ρ and φ mesons at H1. Xavier Janssen Universiteit Antwerpen
Diffractive electroproduction of ρ and φ mesons at Universiteit Antwerpen E-mail: xavier.janssen@ua.ac.be Diffractive electroproduction of ρ and φ mesons is measured at HERA with the detector in the elastic
More informationDESY Physics Review Committee, Oct. 28, H1 Status Report. Cristinel Diaconu CPP Marseille / DESY. H1 data taking in 2004
DESY Physics Review Committee, Oct. 28, 2004 H1 Status Report Cristinel Diaconu CPP Marseille / DESY H1 data taking in 2004 New preliminary results and publications Detector preparation (shutdown) Conclusions
More informationOpen Issues in DIS The High Energy Perspective
Open Issues in DIS The High Energy Perspective My private point of view using data from DIS in collider mode: Accelerator and Experiments HERA success story: Precision cross sections, structure functions
More informationarxiv:hep-ex/ v1 18 Sep 2006
arxiv:hep-ex/699 v 8 Sep 6 Hadronic final states and CD studies at HERA C. Glasman (on behalf of the and H Collaborations) Universidad Autónoma de Madrid Results on CD studies from the H and Collaborations
More informationMeasurements of the Proton F L and F 2 Structure Functions at Low x at HERA
Measurements of the Proton F L and F 2 Structure Functions at Low x at HERA Andrei Nikiforov DESY on behalf of the H1 and ZEUS collaborations Moriond QCD, La Thuile, 13 March 2008 Andrei Nikiforov DESY
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 informationQCD results from colliders
QCD results from colliders 2007 Aspen Winter Conference Wesley H. Smith U. Wisconsin - Madison January 11, 2007 Outline: Parton Density Functions & Structure Functions Jets & Measurements of α S Multijets,
More informationStudy of Charm Fragmentation at H1
Study of Charm Fragmentation at H1 Juraj Braciník (in collaboration with Zuzana Rúriková and Günter Grindhammer) University of Birmingham for H1 Collaboration Birmingham particle group seminar 18/2/2009
More informationSearch for Resonant Slepton Production with DØ
Overview Search for Resonant Slepton Production with DØ Christian Autermann, III. Phys. Inst. A, RWTH Aachen Event Topology Data Selection and Efficiencies Control Plots Selection Optimization Preliminary
More informationHEAVY QUARKS FROM PHOTOPRODUCTION (AND DIS)
HEAVY QUARKS FROM PHOTOPRODUCTION (AND DIS) INT 20, Seattle EIC workshop Week 6, Oct. 22, 20 H. Spiesberger based on work in collaboration with A. Kadeer, B. Kniehl, G. Kramer, C. Pisano, I. Schienbein,
More informationLepton-hadron collider for the 2020s, based on the high lumi LHC Can we add ep and ea collisions to the existing LHC pp, AA and pa programme?
Paul Newman Birmingham University Jammu, 8 September 2013 http://cern.ch/lhec Lepton-hadron collider for the 2020s, based on the high lumi LHC Can we add ep and ea collisions to the existing LHC pp, AA
More informationPaul Newman Birmingham University Lepton-hadron collider based on the high lumi LHC Can we add ep and ea collisions to the existing LHC pp, AA and pa
Paul Newman Birmingham University Lepton-hadron collider based on the high lumi LHC Can we add ep and ea collisions to the existing LHC pp, AA and pa programme? 1 [CERN Courier, June 2014] Lepton-hadron
More informationElectroweak constraints from HERA. 1 Introduction. Elisabetta Gallo INFN Firenze Via G. Sansone 1 I Sesto Fiorentino, ITALY
Elisabetta Gallo INFN Firenze Via G. Sansone I59 Sesto Fiorentino, ITALY Introduction The ep accelerator HERA at the laboratory DESY in Hamburg terminated activity on 3th June 7. The two experiments H
More informationElectroweak Measurements at LHCb!
Electroweak Measurements at LHCb! Simone Bifani University of Birmingham (UK) on behalf of the LHCb collaboration LHCb workshop on quantum interference effects, QCD measurements and generator tuning CERN,
More informationRecent Developments in Quarkonium and Open Flavour Production Calculations
Recent Developments in Quarkonium and Open Flavour Production Calculations Mathias Butenschön (Hamburg University) XIV International Conference on Hadron Spectroscopy Production and decay rates of Heavy
More informationStructure Functions. From HERA to LHC. Hans-Christian Schultz-Coulon Universität Heidelberg
Structure Functions From HERA to LHC Hans-Christian Schultz-Coulon Universität Heidelberg Introduction to high energy particle and nuclear physics Lecture week, Oslo, March 7 th, 6 International Research
More informationPoS(DIFF2006)011. Vector Mesons at H1. Niklaus Berger
Institute for Particle Physics, ETH Zurich, 893 Zurich, Switzerland E-mail: nberger@phys.ethz.ch on behalf of the H collaboration The study of exclusive vector meson production at HERA sheds light on the
More informationZEUS Status Report Recent Results and Progress PRC, DESY
7 th May 4 Recent Results and Progress PRC, DESY Richard Hall-Wilton (University College London) ZeVis Zeus Run 4883 Event 969 date: 8--4 time: 9:5:54 E=6 GeV E t=9 GeV E r = GeV p t=.6 GeV phi=.66 t =-.8
More informationRECENT RESULTS FROM THE ZEUS EXPERIMENT
Proceedings of the DIS 4, Štrbské Pleso, Slovakia RECENT RESULTS FROM THE EXPERIMENT WESLEY H. SMITH (ON BEHALF OF THE COLLABORATION) Physics Dept., University of Wisconsin, Madison, WI 5376 USA E-mail:
More informationElectroweak measurements at HERA
Electroweak measurements at HERA Alex Tapper DESY forum 1 th & 13 th September 006 Precision electroweak measurements: What can HERA contribute? Outline Introduction High Q physics at HERA Review of recent
More informationIsolated Leptons in Events with Large Missing Transverse Momentum at HERA
Isolated Leptons in Events with Large Missing Transverse Momentum at HERA J. Ferrando University of Oxford February 2 th, 2008 J. Ferrando Isolated Leptons at HERA / 30 Outline 2 Isolated Lepton 3 4 James
More informationThe transition from pqcd to npqcd
The transition from pqcd to npqcd A. Fantoni (INFN - Frascati) First Workshop on Quark-Hadron Duality and the Transition to pqcd Laboratori Nazionali di Frascati, Italy June 6-8, 2005 Introduction Overview
More informationSearches for (non-susy) Exotics at HERA
Searches for (non-susy) Exotics at HERA Linus Lindfeld, University of Zürich UNIVERSITAS TURICENSIS MDCCC III Int. Conference on Supersymmetry and the Unification of Fundamental Interactions Irvine, California,
More informationPhysics at HERA. Contents HERA and ZEUS Electroweak results Structure of the proton. Katsuo Tokushuku (KEK, ZEUS)
Physics at HERA e p Contents HERA and ZEUS Electroweak results Structure of the proton Katsuo Tokushuku (KEK, ZEUS) 3/March/5 K.Tokushuku(KEK) @ KEKPH5 / HERA: 7.5GeV 9GeV the world largest electron microscope
More informationRichard Hall-Wilton University College London. July 2002
PPRP, Richard Hall-Wilton University College London July 2002 July 2002, RAL Overview Introduction to HERA and ZEUS Detector Status Central Tracking Detector Microvertex Detector Global Tracking Trigger
More informationSUSY Phenomenology & Experimental searches
SUSY Phenomenology & Experimental searches Alex Tapper Slides available at: http://www.hep.ph.ic.ac.uk/tapper/lecture.html Reminder Supersymmetry is a theory which postulates a new symmetry between fermions
More information3.2 DIS in the quark parton model (QPM)
Experimental studies of QCD 1. Elements of QCD 2. Tests of QCD in annihilation 3. Studies of QCD in DIS 4. QCD in collisions 3.2 DIS in the quark parton model (QPM) M W Elastic scattering: W = M only one
More informationF 2. cc _ Q 2 =2GeV 2. Q 2 =4GeV 2 Q 2 =6.5G Q 2 =35 G. Q 2 =12 GeV 2. Q 2 =20 GeV 2. Q 2 =120GeV 2. Q 2 =60 GeV 2 Q 2 =200G. HERA (pre.
F cc _ Q =GeV Q =4GeV Q =6.5G.5-4 -3-4 -3-4.5 Q = GeV Q = GeV Q =35 G -3-3 - -3.5 Q =6 GeV Q =GeV Q =G. -3 - Q =4GeV - - - - - Q = GeV - HERA (pre H D* HERA H D* HERA H LTT HER H LTT HER ZEUS µ 5 ZEUS
More informationInitial-state splitting
QCD lecture (p. 14) 1st order analysis For initial state splitting, hard process occurs after splitting, and momentum entering hard process is modified: p zp. σ g+h (p) σ h (zp) α sc F π dz dkt 1 z kt
More informationUpdate on Search for Resonant Slepton Production
Overview Update on Search for Resonant Slepton Production Christian Autermann III. Phys. Inst. A, RWTH Aachen Luminosity Di-µ Trigger Efficiency & Error QCD Estimation New Limits Supported by Christian
More informationExperimental Summary 40 th Rencontres de Moriond QCD and High Energy Hadronic Interactions. Heidi Schellman Northwestern University
Experimental Summary 40 th Rencontres de Moriond QCD and High Energy Hadronic Interactions Heidi Schellman Northwestern University Thank you To the conference organizers The secretariat The Hotel Planibel
More informationSearch for Resonant Slepton Production with the DØ-Experiment
Overview Search for Resonant Slepton Production with the DØ-Experiment Christian Autermann, III. Phys. Inst. A R-parity violating Supersymmetry Resonant Slepton Production and Neutralino Decay Data selection
More informationSearch for BFKL Dynamics in Deep Inelastic Scattering at HERA. Preliminary Examination
Search for BFKL Dynamics in Deep Inelastic Scattering at HERA Preliminary Examination!!! " # # # ## $ $ $ $$ Sabine Lammers University of Wisconsin December 20, 2000 Sabine Lammers, UW Madison Preliminary
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 informationProton anti proton collisions at 1.96 TeV currently highest centre of mass energy
Tevatron & Experiments 2 Proton anti proton collisions at 1.96 TeV currently highest centre of mass energy Tevatron performing very well 6.5 fb 1 delivered (per experiment) 2 fb 1 recorded in 2008 alone
More informationHeavy Quark HERA II
Brian Foster Oxford University Heavy Quark Physics @ HERA II DESY 11.11.03 What s new for HERA II and what does it mean for HQ physics a reminder.. HQs in DIS, diffraction, photoproduction Spectroscopy
More informationSearch for physics beyond the SM in ep collisions at HERA
Search for physics beyond the SM in ep collisions at HERA L.Bellagamba (INFN Bologna) on behalf of the H1 and ZEUS Collaboration L.Bellagamba, Search for physics beyond the SM in ep collisions at HERA,
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 informationThe HERAPDF1.0 PDF set, which was an NLO QCD analysis based on H1 and ZEUS combined
Oford University E-mail: a.cooper-sarkar@physics.o.ac.uk The HERAPDF. PDF set, which was an NLO QCD analysis based on H and ZEUS combined inclusive cross section data from HERA-I, has been updated to HERAPDF.5
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 information