J/ψ µµ: sidebands subtraction
|
|
- Luke Andrews
- 6 years ago
- Views:
Transcription
1 J/ψ µµ: sidebands subtraction Stefano Recanatesi Università degli studi di Pisa Summer Student CERN 2010 August 27, 2010 Supervisors: Sara Bolognesi, Marco De Mattia 1 Introduction At the startup of LHC the dimuon resonances (J/ψ, Y, Z), well known in the standard model, are playing a crucial role for commissioning studies. These events can be exploited to have a deeper understanding of the behavior of the detector. In particular it is possible to understand the precision in the measurment of the track resolution and scale. For instance in the MuscleFit [1] algorithm the constrain on the J/ψ mass is used to calibrate the muon momentum scale and the J/ψ lineshape is exploited to extract the muon momenutm resolution. In this framework I have considered the J/ψ decay into two muons and I have studied the kinematic distributions of this process. The aim of this work is to figure out which kind of kinematic variables are well reconstructed in the detector and which of them can be used to select J/ψ signal. This report, after a short review of the samples (data and MC) used, explains firstly the method I have used to select the J/ψ µµ events from the background, the so called sidebands subtraction method, afterwords I report a deep analysis of the kinematic distributions of J/ψ events with the help of this tool. At the end I will draw my conclusions. 2 Technical details I use data in PAT format from the official production of the quarkonia group which runs on a dedicated central skim. At least two muons with M(µµ) 2 GeV are requested at this stage, then I have applied additional selection cuts. In CMS muons can be reconstructed from a combined fit to the inner silicon track with the outer track in the muon chambers (global muons). Very low P t muons can cross only one muon station, in this case the inner track must be compatible with the muon hits but a full fit to those hits is not attempted (tracker muons). In my analysis I search for a pair of global muons. If I couldn t find it, I look??? for a global-tracker pair. In the case that even such pair is not found I ask for a tracker-tracker muons pair. After this search I impose some additional cuts for both tracker and global muons which are reported in Table:1. The cuts for a global muon selection have to be added to those for a tracker muon selection. All the cuts are very loose and their aim is to have a well renconstructed track that you can use in your analysis for commissioning studies. I analyzed nb 1 of data, selecting good runs and lumisections from central CMS validation. I have considered three MonteCarlo samples: prompt J/ψ production (75nb 1 ) /JPsiToMuMu 2MuPEtaFilter 7TeV-pythia6-evtgen/Spring10-START3X V26-v1, 1
2 T selection: G selection: inner track hits > 11; global track reduced χ 2 < 20.0; inner track reduced χ 2 < 4.0; number of valid muon hits > 0; number of pixel layers with measurement 1; transverse impact parameter < 3.0 cm; longitudinal impact parameter < 15.0 cm; good matchint track-muon hits (TMLastStationAngTight); Table 1: Cuts on tracker and global muons. background (122 nb 1 ) /ppmux/spring10-start3x V26 S09-v1. B J/ψ X (120 nb 1 ) /BpToJPsiMuMu 2MuPtEtaFilter 7TeV-pythia6-evtgen/Spring10-START3X V26-v1 Here I will show the results only for the signal sample with prompt J/ψ. In this MC sample the following cuts at generator level are applied: P µ > 2.5 GeV; η µ < 2.5. These cuts make the MC slightly different from the data as will be discussed in the following. Even if I should have used the same trigger for data and MC, that is HLT L1 MuOpen, I couldn t because this trigger was not available in simulation. More strict triggers can be applied, nevertheless in a commissioning study you are not so interested in having the right normalization while is more important to maximize the statistic. 3 Sidebands subtraction method The method of the sidebands subtraction aims to have the kinematic distributions for those events in which a J/ψ is present. To achieve this aim it is necessary to eliminate the events of background under the mass peak. The starting assumption is that the kinematic variable distributions for the background in the peak region of the J/ψ are extremely similar to the average of the same distributions for events in the sidebands regions. In practice the strategy can be explained in three easy steps: You define the sidebands of the peak as in fig:1a paying attention to the following issues: the sidebands have not to be in a region in which another resonance is present (e.g. ψ 2s with mass 3.65 GeV); they must be a bit far from the peak beacause you don t want events from the peak in the sidebands and the final state radiation makes the peak tail longer on the left side; they must be as equal as possible in dimension but sufficently large. You take a given kinematic distribution for the three regions. These distributions can be called 1 Φ left, Φ peak, Φ right. You fit the sidebands with a curve like k 1 + k x 2 2 (fig:1b) and the area under the fit in the peak region is an estimation of the number of events due to the background. The areas under the fit for the three regions can be called A left, A peak, A right. A You procede in doing the subtraction calculating Φ sub = Φ peak peak A left +A right (Φ left + Φ right ) that is the distribution you want. As it is possible to see the sidebands I chose are different one from the other. To understand why this doesn t introduce an error it is possible to look at the ratio between the sidebands subtracted distribution for the transverse momentum choosing in one case the sidebands as in fig:1a and in the other equally far from the peak and of the same size (the one of the right sideband in the previous case). This ratio is represented in fig:2. 2
3 (a) The sidebands defined for the sidebands subtraction(b) The fit to the sidebands to estimate the number of and the region of the peak events of background in the peak region Figure 1: J/ψ peak analysis Figure 2: ratio between sidebands subtracted P t for equal sidebands and different sidebands 4 Application of the method Now it is possible to apply this tool to many variables and to confront the subtracted distributions with the MC. 4.1 Transverse momentum P t of the J/ψ In fig:4a it is possible to see the distribution for the sidebands and the peak normalized to have the same area (MC is normalized to Data), the same normalization is applied to all the following histograms if not otherwise specified. It is possible to see on this plot that the transverse momentum of the peak region is harder and its shape is driven by the acceptance in η of the detector. It is also possible to see the difference between the two sidebands and the fact that the right one is a bit harder in P t. In fig:5b the data before and after the subtraction are compared with MC. The MC is not in agreement with the data because of the cut P µ 2.5 GeV that makes the MC spectrum harder. It is possible to have a better agreement between MC and data asking for the reconstructed momentum of the J/ψ to point in the barrel so that the muons must have a larger momentum. The plot for the P t distributions of J/ψ pointing in the barrel ( η(j/ψ) < 1.1) or endcap ( η(j/ψ) > 1.9) are represented in fig:4. To explain the kinematics of every single events it is worthy to look also at the P z of the J/ψ and at the φ and 3
4 η between the two muons. Before moving in this direction I will explain why the acceptance of the detector is so relevant in these plots. (a) P t for the three regions (b) P t sidebands subtraction Figure 3: P t analysis (a) P t for J/ψ in the barrel (b) P t for J/ψ in the endcap Figure 4: P t for J/ψ in barrel and endcap respectevly 4.2 Detector acceptance The pair of muons recontructed in the detector can be of four different kinds, where the fact of being reconstructed from a endcap or from the barrel makes the difference. In fig:5 it is possible to see the four configurations. The second is not allowed by the kinematic for a muon pair coming from a J/ψ. The configurations with at least one muon in the barrell are suppressed because for a muon to go through the barrel a transverse momentum of at least about 3 GeV is needed. You can see these characteristics looking to fig:6a and fig:6b where the fact that most of the muons goes to the endcaps is evident in the first plot and the little bump at 3 GeV in the second is an estimation of the P t needed by a muon to go through the barrel. 4.3 η between two muons In fig:7a it is possible to see the correlation between the η of the two muons and the P t of the reconstructed J/ψ. In this plot is visible the acceptance of the detector. In the plot after the subtraction 4
5 (a) endcap-same endcap (b) forward endcapbackward endcap (c) endcap-barrel (d) barrel-barrel Figure 5: Di-muons events in CMS (a) η muons distribution (b) P t muons distribution Figure 6: Muons kinematic variables (fig:7b) is evident how a large region of the plot is kinematically suppressed. Such kind of suppression is easy explained if you look at the distibution of η vs M of the reconstructed J/ψ in fig:8: an invariant mass of at least 5 GeV is needed by the two muons to have a η 2.5. It is interesting to look also at the plots in one dimension for η (fig:??). In particular fig:9b describes the ratio between MC and Data which is close to one. (a) η vs P t for all the data (b) η vs P t sidebands subtraction for peak region Figure 7: η vs P t study 5
6 Figure 8: η vs M for al the data (a) η for data and MC (b) Ratio betwee η for data and MC Figure 9: η analysis 4.4 φ between two muons In fig:10a there is the φ of the muons against the P t of the J/ψ and in fig:10b there is the distribution after the subtraction. Once again the behavior of the acceptance of the detector is visible thanks to the shape of the white region in the down left part of the plot. The correlation between the two variable is evident and this plot is in good agreement with MC. When the P t is equal to zero the φ can be π, increasing the J/ψ boost in the transverse plane the φ of the two muons decreases. It is interesting to look also at the plots in one dimension for φ. In particular the second plot describe the ratio between MC and Data. 4.5 P z of the J/ψ To have a complete view of the event I report here the distribution of the J/ψ P z both for MC and data before and after the subtraction in fig:12a and their ratio in fig:12b. The distribution of the MC agrees with data in a fairly good way. 6
7 (a) φ vs P t for all the data (b) φ vs P t sidebands subtraction for peak region Figure 10: φ vs P t study (a) φ for data and MC (b) Ratio between φ for data and MC Figure 11: φ analysis (a) P z for data and MC (b) P z ratio between data and MC Figure 12: Distribution of J/ψ P z 5 Conclusion In the analysis of the new data at CMS it is worthy to use as many tool as possible to extract the largest possible amount of information. The sidebands subtraction is one of that tool that allows you to investigate the phisics of the kinematic distibutions of the signal. For commissioning studies it would be 7
8 a good thing to investigate also those variables that are related with detector performaces like the number of hits in the tracker. This could improve the reconstruction of the momentum scale and resolution of CMS. References [1] The CMS collaboration, CMS PAS TRK
arxiv: v1 [hep-ex] 2 Nov 2010
Early b-physics at CMS Andrea Rizzi EH Zurich, Switzerland arxiv:.64v [hep-ex] Nov he CMS experiment at the Large Hadron Collider collected in the first months of operation a luminosity of about /nb. he
More informationThe Compact Muon Solenoid Experiment. Conference Report. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland. Rare B decays at CMS
Available on CMS information server CMS CR -2017/115 The Compact Muon Solenoid Experiment Conference Report Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland 17 April 2017 (v4, 10 May 2017) Rare
More informationPERFORMANCE OF THE ATLAS MUON TRIGGER IN RUN 2
PERFORMANCE OF THE ATLAS MUON TRIGGER IN RUN 2 M.M. Morgenstern On behalf of the ATLAS collaboration Nikhef, National institute for subatomic physics, Amsterdam, The Netherlands E-mail: a marcus.matthias.morgenstern@cern.ch
More informationMuon commissioning and Exclusive B production at CMS with the first LHC data
Muon commissioning and Exclusive B production at CMS with the first LHC data Silvia Taroni INFN Milano Bicocca On the behalf of the CMS collaboration Outline Introduction CMS detector Muon detection in
More informationMuon reconstruction performance in ATLAS at Run-2
2 Muon reconstruction performance in ATLAS at Run-2 Hannah Herde on behalf of the ATLAS Collaboration Brandeis University (US) E-mail: hannah.herde@cern.ch ATL-PHYS-PROC-205-2 5 October 205 The ATLAS muon
More informationb and c production in CMS
b and c production in CMS and ATLAS Francesco Fiori on behalf of CMS and ATLAS collaborations VII Meeting on B-physics (LAL) LHC luminosity evolution LHC startup in March 2010 9.67 pb -1 delivered lumi
More informationStudies of rare B meson decays with the CMS detector
Studies of rare B meson decays with the detector J.Pazzini on behalf of the Collaboration Padova University & INFN - August - 3 J.Pazzini Studies of rare B meson decays with the detector (SUSY3) Introduction
More informationSusanna Costanza. (Università degli Studi di Pavia & INFN Pavia) on behalf of the ALICE Collaboration
(Università degli Studi di Pavia & INFN Pavia) on behalf of the ALICE Collaboration 102 Congresso della Società Italiana di Fisica Padova, 26-30 settembre 2016 Outline Heavy flavour physics in ALICE The
More informationWalter Hopkins. February
B s µ + µ Walter Hopkins Cornell University February 25 2010 Walter Hopkins (Cornell University) Bs µ + µ February 25 2010 1 / 14 Motivation B s µ + µ can only occur through higher order diagrams in Standard
More information2 The ATLAS Experiment at the Large Hadron Collider at CERN
Studies of the Di-Muons Resonances at the ATLAS Experiment at CERN PhD Detailed Research Project PhD Candidate: Camilla Maiani Supervisor: Prof. Carlo Dionisi, Dott. Stefano Giagu Università di Roma La
More informationATLAS muon reconstruction efficiency with a tag & probe technique on Z boson dimuon decay
ATLAS muon reconstruction efficiency with a tag & probe technique on Z boson dimuon decay ------Alessandro Manfredini-----Muon Combined Performance group (Roma Tre University) Talk structure: Introduction:
More informationATLAS EXPERIMENT : HOW THE DATA FLOWS. (Trigger, Computing, and Data Analysis)
ATLAS EXPERIMENT : HOW THE DATA FLOWS (Trigger, Computing, and Data Analysis) In order to process large volumes of data within nanosecond timescales, the trigger system is designed to select interesting
More informationJ/ψ μ + μ Reconstruction in CMS
Available on CMS information server CMS AN 2006/094 April 2006 J/ψ μ + μ Reconstruction in CMS Zongchang YANG, Sijin QIAN Peking University, China Abstract In this note the J/ψ μ + μ reconstruction performance
More informationPrecise measurement of W mass at LHC with the CMS detector
Precise measurement of W mass at LHC with the CMS detector M. Bachtis*, M.R. d Alfonso, L. Perrozzi +GR+ CERN O. Cerri, N. Foppiani, E. Manca, A. Stacchiotti Students @ Scuola Normale - Pisa * now UCLA
More informationQuarkonium Physics at CMS
Quarkonium Physics at CMS Daniele Fasanella University & INFN of Bologna on Behalf of the CMS Collabora4on CMS Quarkonium Studies Heavy quarkonia are an excellent laboratory for understanding QCD non-
More informationUNIVERSITÀ DEGLI STUDI DI MILANO - BICOCCA DIPARTIMENTO DI FISICA G. OCCHIALINI CORSO DI DOTTORATO IN FISICA E ASTRONOMIA CICLO XXVII
UNIVERSITÀ DEGLI STUDI DI MILANO - BICOCCA DIPARTIMENTO DI FISICA G. OCCHIALINI CORSO DI DOTTORATO IN FISICA E ASTRONOMIA CICLO XXVII Measurement of the branching fraction of B c + J/ψπ + π π + relative
More informationCalibration of the CMS Electromagnetic Calorimeter with first LHC data
IPRD10 Siena, June 7-10 2010 1 Calibration of the CMS Electromagnetic Calorimeter with first LHC data Maria Margherita Obertino (Universita del Piemonte Orientale INFN Torino) On behalf of the CMS Collaboration
More informationThe CMS Particle Flow Algorithm
PROCEEDINGS of CHEF 13 he CMS Particle Flow Algorithm Laboratoire Leprince-Ringuet, INP3-CNRS E-mail: Florian.Beaudette@cern.ch A particle flow event-reconstruction algorithm has been successfully deployed
More informationMuon Alignment at CMS
Muon Alignment at CMS for CMS Collaboration 1 The CMS Detector Compact Muon Solenoid 8[7] TeV in Run 1 > 13 TeV for Run 2 4 main components Tracker Electromagnetic Calorimeter Hadron Calorimeter Superconducting
More informationElectron reconstruction and identification in CMS at LHC
Electron reconstruction and identification in CMS at LHC on behalf of CMS collaboration 1 Outline The CMS detector @ LHC Electron reconstruction components Performance Electron identification Measurements
More informationMeasurement of the baryon number transport with LHCb
Measurement of the baryon number transport with LHCb Marco Adinolfi University of Bristol On behalf of the LHCb Collaboration 13 April 2011 / DIS 2011 Marco Adinolfi DIS 2011-13 April 2011 - Newport News
More informationQuarkonium production in CMS
Quarkonium production in CMS Hyunchul Kim (Korea University For the CMS collaboration Content CMS detector@lhc Quarkonia physics motivation Result from CMS Charmonia : J/ψ Bottomonia : ϒ Summary HIM@Pyeongchang,
More informationPerformance of muon and tau identification at ATLAS
ATL-PHYS-PROC-22-3 22/2/22 Performance of muon and tau identification at ATLAS On behalf of the ATLAS Collaboration University of Oregon E-mail: mansoora.shamim@cern.ch Charged leptons play an important
More informationStudies on the e + e - spectrum with the first data of the CMS experiment at the Large Hadron Collider
Studies on the e + e - spectrum with the first data of the CMS experiment at the Large Hadron Collider Dottorando: Alessandro Palma alessandro.palma@roma1.infn.it Relatori: Prof. E. Longo Dott. R. Paramatti
More informationStatus and Performance of the ATLAS Experiment
Status and Performance of the ATLAS Experiment P. Iengo To cite this version: P. Iengo. Status and Performance of the ATLAS Experiment. 15th International QCD Conference (QCD 10), Jun 2010, Montpellier,
More informationStatus of the LHCb experiment and minimum bias physics
Status of the LHCb experiment and minimum bias physics Sebastian Bachman Heidelberg University on behalf of the LHCb collaboration 6/19/2010 Sebastian Bachmann 1 Beauty and Charm at the LHC LHC is a factory
More informationProduction and Decays of Heavy Flavours in ATLAS
Production and Decays of Heavy Flavours in ATLAS Vincenzo Canale Università di Napoli Federico II and INFN Alessandro Cerri University of Sussex Xth Rencontres du Vietnam - Flavour Physics Conference ICISE,
More informationText. Decays of heavy flavour hadrons measured by CMS and ATLAS. M.Smizanska, Lancaster University
Text Decays of heavy flavour hadrons measured by CMS and ATLAS M. Outline Data collection and B-trigger strategies ID performance with increasing pileup Lifetimes B avg Bs, Bd Masses Λ b Bc Searches for
More informationHeavy Hadron Production and Spectroscopy at ATLAS
Heavy Hadron Production and Spectroscopy at ALAS Carlo Schiavi on behalf of the ALAS Collaboration INFN Sezione di Genova ALAS has studied heavy flavor production and measured the production cross sections
More informationConference Report Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland
CMS CR - he Compact Muon Solenoid Experiment Conference Report Mailing address: CMS CERN, CH- GENEVA 3, Switzerland 8/5/6 Charmonium production measured in and pp collisions by CMS arxiv:7.5v [nucl-ex]
More informationHiggs cross-sections
Ph.D. Detailed Research Project Search for a Standard Model Higgs boson in the H ZZ ( ) 4l decay channel at the ATLAS Experiment at Cern Ph.D. Candidate: Giacomo Artoni Supervisor: Prof. Carlo Dionisi,
More informationLHCb Semileptonic Asymmetry
CERN E-mail: mika.vesterinen@cern.ch A recent measurement of the CP violating flavour specific asymmetry in B s decays, a s sl, is presented. This measurement is based on a data sample corresponding to
More informationAlignment of the ATLAS Inner Detector. Oscar Estrada Pastor (IFIC-CSIC)
Alignment of the ATLAS Inner Detector Oscar Estrada Pastor (IFIC-CSIC) 1 Summary table Introduction. ATLAS: the detector. Alignment of the Inner Detector. Weak modes. Weak modes using J/Psi resonance.
More informationZ-Path 2014 Event Displays Examples of l + l -, and 4-lepton events
Z-Path 2014 Event Displays Examples of l + l -, and 4-lepton events This compilation goes through examples of events the students will be looking at. This includes events easy to interpret, as well as
More informationThe ATLAS trigger - commissioning with cosmic rays
Journal of Physics: Conference Series The ATLAS trigger - commissioning with cosmic rays To cite this article: J Boyd 2008 J. Phys.: Conf. Ser. 119 022014 Related content - The ATLAS Level-1 Central Trigger
More informationEarly physics with Atlas at LHC
Early physics with Atlas at LHC Bellisario Esposito (INFN-Frascati) On behalf of the Atlas Collaboration Outline Atlas Experiment Physics goals Next LHC run conditions Physics processes observable with
More informationObservation of the rare B 0 s µ + µ decay
Observation of the rare B 0 s µ + µ decay The combined analysis of CMS and LHCb data Luke Pritchett April 22, 2016 Table of Contents Theory and Overview Detectors Event selection Analysis Flavor physics
More informationTHE ATLAS TRIGGER SYSTEM UPGRADE AND PERFORMANCE IN RUN 2
THE ATLAS TRIGGER SYSTEM UPGRADE AND PERFORMANCE IN RUN 2 S. Shaw a on behalf of the ATLAS Collaboration University of Manchester E-mail: a savanna.marie.shaw@cern.ch The ATLAS trigger has been used very
More informationInclusive SUSY Searches at CMS with Emphasis on Detector Systematics
Inclusive SUSY Searches at with Emphasis on Detector Systematics R. Cavanaugh (on behalf of ) University of Florida SUSY06 Detector Background Calibrations Inclusive Search Strategies Detector Systematics
More informationPoS(BEAUTY2016)023. Heavy flavour production at CMS. Giulia Negro. CEA/IRFU,Centre d etude de Saclay Gif-sur-Yvette (FR)
CEA/IRFU,Centre d etude de Saclay Gif-sur-Yvette (FR) E-mail: giulia.negro@cern.ch hree recent results in heavy flavour production at the experiment are addressed in this report. Measurements of the differential
More informationStatus of ATLAS and Preparation for the Pb-Pb Run
Status of ATLAS and Preparation for the Pb-Pb Run Jiří Dolejší a for the ATLAS Collaboration a Charles University, Faculty of Mathematics and Physics, IPNP, V Holesovickach 2, CZ-180 00 Praha 8, Czech
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 informationREADINESS OF THE CMS DETECTOR FOR FIRST DATA
READINESS OF THE CMS DETECTOR FOR FIRST DATA E. MESCHI for the CMS Collaboration CERN - CH1211 Geneva 23 - Switzerland The Compact Muon Solenoid Detector (CMS) completed the first phase of commissioning
More informationATLAS Event. IFAE 2011 Incontro di Fisica delle Alte Energie Perugia April Elvira Rossi. Università degli Studi di Napoli Federico II
ATLAS Event sto IFAE 2011 Incontro di Fisica delle Alte Energie Perugia 27-29 April 2011 J/!!"+"- ATLAS Event Elvira Rossi Università degli Studi di Napoli Federico II On behalf of ATLAS Collaboration
More informationDilepton Forward-Backward Asymmetry and electroweak mixing angle at ATLAS and CMS
Dilepton Forward-Backward Asymmetry and electroweak mixing angle at ATLAS and CMS University of Rochester E-mail: jyhan@fnal.gov We present measurements of the forward-backward asymmetry in Drell-Yan dilepton
More informationCMS Conference Report
Available on CMS information server CMS CR 2001/004 CMS Conference Report April 13, 2001 Prospects of B-Physics with CMS a) Sunanda Banerjee 1) Abstract Prospects of studies of properties of b flavoured
More informationQCD Studies with CMS at LHC. Gunther Roland for the Collaboration
QCD Studies with CMS at LHC Gunther Roland for the Collaboration INT Seattle 5/24/2010 First 7 TeV Collisions: March 30th 2010 2 QCD Studies with CMS pp integrated luminosity ~ 10nb -1 n.b. rates for LHC
More informationAlignment of the ATLAS Inner Detector tracking system
Alignment of the ALAS Inner Detector tracking system Oleg BRAND University of Oxford and University of Göttingen E-mail: oleg.brandt@cern.ch he Large Hadron Collider (LHC) at CERN is the world largest
More informationSearches for Exotics in Upsilon Decays in BABAR
Searches for Exotics in Upsilon Decays in BABAR Yury Kolomensky UC Berkeley/LBNL For the BABAR Collaboration 14th Lomonosov Conference on Elementary Particle Physics August 24, 2009, Moscow Light Higgs
More informationQuarkonium LHCb
Quarkonium Studies @ LHCb Giacomo Graziani (INFN Firenze) on behalf of the LHCb Collaboration December 5th, 2008 QWG08, Nara G. Graziani slide 1 QWG08 The LHCb Experiment dedicated to CP violation and
More informationPoS(CORFU2016)060. First Results on Higgs to WW at s=13 TeV with CMS detector
First Results on Higgs to WW at s=13 ev with CMS detector Università di Siena and INFN Firenze E-mail: russo@fi.infn.it he first measurement of the Higgs boson cross section at 13 ev in H WW 2l2ν decay
More informationLepton and Photon reconstruction and identification performance in CMS and ATLAS
Lepton and Photon reconstruction and identification performance in CMS and ATLAS Sandro Fonseca de Souza, on behalf of the CMS and ATLAS Collaborations Universidade do Estado do Rio de Janeiro Large Hadron
More informationPhysics potential of ATLAS upgrades at HL-LHC
M.Testa on behalf of the ATLAS Collaboration INFN LNF, Italy E-mail: marianna.testa@lnf.infn.it ATL-PHYS-PROC-207-50 22 September 207 The High Luminosity-Large Hadron Collider (HL-LHC) is expected to start
More informationA Search for Excess Dimuon Production in the Radial Region (1.6 < r < 10) cm at the DØ Experiment
1 A Search for Excess Dimuon Production in the Radial Region (1.6 < r < 10) cm at the DØ Experiment Fermilab International Fellow Lancaster University On behalf of the DØ Collaboration 2 Introduction I
More informationOctober 4, :33 ws-rv9x6 Book Title main page 1. Chapter 1. Measurement of Minimum Bias Observables with ATLAS
October 4, 2018 3:33 ws-rv9x6 Book Title main page 1 Chapter 1 Measurement of Minimum Bias Observables with ATLAS arxiv:1706.06151v2 [hep-ex] 23 Jun 2017 Jiri Kvita Joint Laboratory for Optics, Palacky
More informationSecond year seminar. Massimiliano Marchisone. Torino, 03/05/2013. Università di Torino e INFN Université Blaise Pascal de Clermont-Ferrand et LPC
Second year seminar Massimiliano Marchisone Università di orino e INFN Université Blaise Pascal de Clermont-Ferrand et LPC orino, 03/05/2013 Massimiliano Marchisone, 03/05/2013 Second year seminar, orino
More informationOpen-charm and J/ψ production at the ALICE experiment
Open-charm and J/ψ production at the ALICE experiment Pietro Cortese Università del Piemonte Orientale and INFN Alessandria, Italy on behalf of the ALICE Collaboration Purdue University, Jan. 6, 2011 Pietro
More informationPerformance of the ALICE Muon Trigger system in Pb Pb collisions
Performance of the ALICE Muon Trigger system in Pb Pb collisions, for the ALICE collaboration Dipartimento di Fisica Sperimentale dell Università di Torino and Sezione INFN di Torino, Turin, Italy Laboratoire
More informationLuminosity measurement and K-short production with first LHCb data. Sophie Redford University of Oxford for the LHCb collaboration
Luminosity measurement and K-short production with first LHCb data Sophie Redford University of Oxford for the LHCb collaboration 1 Introduction Measurement of the prompt Ks production Using data collected
More informationConference Report Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland
CMS CR CMS Quarkonia Measurements he Compact Muon Solenoid Experiment Conference Report Mailing address: CMS CERN, CH- GENEVA 3, Switzerland /8/6 arxiv:8.577v [hep-ex] 5 Aug Quarkonia Measurements by the
More informationarxiv:hep-ex/ v1 16 Jan 2004
Heavy Flavor Production at the Tevatron Chunhui Chen (Representing the CF and Ø Collaboration) arxiv:hepex/4v 6 Jan 4 epartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 94,
More informationThe first Z boson measurement in the dimuon channel in PbPb collisions at s = 2.76 TeV at CMS
The first Z boson measurement in the dimuon channel in PbPb collisions at s = 2.76 TeV at CMS Lamia Benhabib On behalf of CMS collaboration We present the first measurement of Z bosons in the di-muon channel
More informationRare B decays in ATLAS and CMS
Rare B decays in ATLAS and CMS University Dec. 14 th 2006 Makoto Tomoto Nagoya University on behalf of CMS and ATLAS collaborations Makoto Tomoto (Nagoya University) Outline B physics in ATLAS and CMS
More informationCMS Physics Analysis Summary
Available on the CERN CDS information server CMS PAS EXO-11-009 CMS Physics Analysis Summary Contact: cms-pag-conveners-exotica@cern.ch 01/05/06 Search for Contact Interactions in µ + µ Events in pp Collisions
More informationProspects for quarkonium studies at LHCb. «Quarkonium Production at the LHC» workshop
Prospects for quarkonium studies at LHCb «Quarkonium Production at the LHC» workshop Patrick Robbe, LAL Orsay, 19 Feb 2010 LHCb Detector Forward Spectrometer Geometry, with angular acceptance 15
More informationA Study of the Higgs Boson Production in the Dimuon Channelat 14 TeV
A Study of the Higgs Boson Production in the Dimuon Channelat 14 TeV M.S.El-Nagdy 1, A.A.Abdelalim 1,2, A.Mahrous 1, G.Pugliese 3 and S.Aly 1 (1) Physics department, Faculty of Science, Helwan University,
More informationDi muons and the detection of J/psi, Upsilon and Z 0 Jets and the phenomenon of jet quenching
collisions in CMS Bolek Wyslouch École Polytechnique Massachusetts Institute of Technology on behalf of CMS Collaboration CERN, December 2, 2010 1 Heavy Ions at the LHC Huge energy jump from RHIC: factor
More informationNon-collision Background Monitoring Using the Semi-Conductor Tracker of ATLAS at LHC
WDS'12 Proceedings of Contributed Papers, Part III, 142 146, 212. ISBN 978-8-7378-226-9 MATFYZPRESS Non-collision Background Monitoring Using the Semi-Conductor Tracker of ATLAS at LHC I. Chalupková, Z.
More informationSearches for BSM Physics in Rare B-Decays in ATLAS
Searches for BSM Physics in Rare B-Decays in ATLAS Iskander Ibragimov on behalf of the ATLAS Collaboration SUSY 14 The nd International Conference on Supersymmetry and Unification of Fundamental Interactions
More informationPerformance of CMS muon reconstruction in pp collision events at s = 7 TeV
Journal of Instrumentation OPEN ACCESS Performance of CMS muon reconstruction in pp collision events at s = 7 TeV To cite this article: The CMS collaboration View the article online for updates and enhancements.
More informationCommissioning of the CMS Detector
Commissioning of the CMS Detector Marina Giunta INFN Bologna On behalf of the CMS Collaboration XLIVth Rencontres de Moriond on QCD and High Energy Interactions La Thuile,14-21 March 2009 2008: very busy
More informationIntroduction. The LHC environment. What do we expect to do first? W/Z production (L 1-10 pb -1 ). W/Z + jets, multi-boson production. Top production.
Introduction. The LHC environment. What do we expect to do first? W/Z production (L 1-10 pb -1 ). W/Z + jets, multi-boson production. Top production. Early discoveries? Conclusions. 2 First collisions
More informationMeasurement of Jet Energy Scale and Resolution at ATLAS and CMS at s = 8 TeV
Measurement of Jet Energy Scale and Resolution at ATLAS and CMS at s = 8 TeV EDSBlois 2015 02.07.2015 Dominik Haitz on behalf of the ATLAS and CMS Collaborations INSTITUT FÜR EXPERIMENTELLE KERNPHYSIK
More informationb hadron properties and decays (ATLAS)
b hadron properties and decays (ATLAS) Milind V. Purohit Univ. of South Carolina, USA for the ATLAS collaboration M. V. Purohit SM@LHC 2012 1 Outline Detector, Di muon trigger, Performance: Mass, vertex
More informationPoS(ICHEP2012)238. Search for B 0 s µ + µ and other exclusive B decays with the ATLAS detector. Paolo Iengo
Search for B s µ + µ and other exclusive B decays with the ATLAS detector. On behalf of the ATLAS Collaboration INFN Naples, Italy E-mail: paolo.iengo@cern.ch The ATLAS experiment, collecting data in pp
More informationStatus of the physics validation studies using Geant4 in ATLAS
Status of the physics validation studies using Geant4 in ATLAS On behalf of the ATLAS Geant4 Validation Team A.Dell Acqua CERN EP/SFT, Geneva, CH dellacqu@mail.cern.ch The new simulation for the ATLAS
More informationQuarkonium results in pp collisions from ALICE
Quarkonium results in pp collisions from ALICE Giuseppe E Bruno Università di Bari and INFN Italy for the ALICE collaboration Outline: introduction measurements in pp at s=7 and 2.76 TeV Integrated and
More informationThe Compact Muon Solenoid Experiment. Conference Report. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland. Commissioning of the CMS Detector
Available on CMS information server CMS CR -2009/113 The Compact Muon Solenoid Experiment Conference Report Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland 15 May 2009 Commissioning of the CMS
More informationarxiv: v1 [hep-ex] 9 Jan 2019
Quarkonium production as a function of charged-particle multiplicity in pp and p Pb collisions measured by ALICE at the LHC arxiv:1901.02627v1 [hep-ex] 9 Jan 2019 Discipline of Physics, School of Basic
More informationInvestigation of the Higgs sector using H->ZZ->4l decays precisely reconstructed by the CMS detector
Investigation of the Higgs sector using H->ZZ->4l decays precisely reconstructed by the CMS detector candidate: S. Casasso supervisor: prof. E. Migliore Scuola di Dottorato in "Scienze della Natura e ecnologie
More informationZ boson studies at the ATLAS experiment at CERN. Giacomo Artoni Ph.D Thesis Project June 6, 2011
Z boson studies at the ATLAS experiment at CERN Giacomo Artoni Ph.D Thesis Project June 6, 2011 Outline Introduction to the LHC and ATLAS ((Very) Brief) Z boson history Measurement of σ Backgrounds Acceptances
More informationPerspectives of Charmonium Production at CMS. Zongchang YANG, Peking University 1 st April, University of Virginia (USA)
Perspectives of Charmonium Production at CMS Zongchang YANG, Peking University 1 st April, University of Virginia (USA) Outline Introduction to LHC, CMS and motivations Muon and di-muon trigger Muon and
More informationFuture prospects for the measurement of direct photons at the LHC
Future prospects for the measurement of direct photons at the LHC David Joffe on behalf of the and CMS Collaborations Southern Methodist University Department of Physics, 75275 Dallas, Texas, USA DOI:
More informationQCD Jets at the LHC. Leonard Apanasevich University of Illinois at Chicago. on behalf of the ATLAS and CMS collaborations
QCD Jets at the LHC Leonard Apanasevich University of Illinois at Chicago on behalf of the ATLAS and CMS collaborations Outline Physics at the LHC Jet Reconstruction and Performance Clustering Algorithms
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 informationDesign of the new ATLAS Inner Tracker for the High Luminosity LHC era
Design of the new ATLAS Inner Tracker for the High Luminosity LHC era Trevor Vickey on behalf of the ATLAS Collaboration University of Sheffield, United Kingdom July 3, 2017 19th iworid Krakow, Poland
More informationSearches with Displaced Lepton-Jet Signatures
Searches with Displaced Lepton-Jet Signatures LHC Searches for Long-Lived BSM Particles: Theory Meets Experiment University of Massachusetts Amherst Nov 13 2015 Miriam Diamond University of Toronto ATLAS
More informationValidation of Geant4 Physics Models Using Collision Data from the LHC
Journal of Physics: Conference Series Validation of Geant4 Physics Models Using Collision from the LHC To cite this article: S Banerjee and CMS Experiment 20 J. Phys.: Conf. Ser. 33 032003 Related content
More informationMeasurement of charged particle spectra in pp collisions at CMS
Measurement of arged particle spectra in pp collisions at CMS for the CMS Collaboration Eötvös Loránd University, Budapest, Hungary E-mail: krisztian.krajczar@cern. We present the plans of the CMS collaboration
More informationJet Energy Calibration. Beate Heinemann University of Liverpool
Jet Energy Calibration Beate Heinemann University of Liverpool Fermilab, August 14th 2006 1 Outline Introduction CDF and D0 calorimeters Response corrections Multiple interactions η-dependent corrections
More informationSome studies for ALICE
Some studies for ALICE Motivations for a p-p programme in ALICE Special features of the ALICE detector Preliminary studies of Physics Performances of ALICE for the measurement of some global properties
More informationAlignment of the ATLAS Inner Detector Tracking System
Alignment of the ATLAS Inner Detector Tracking System Department of Physics and Astronomy, University of Pennsylvania E-mail: johnda@hep.upenn.edu These proceedings present the track-based method of aligning
More informationQuarkonia and Open Heavy Flavor Results from CMS
Quarkonia and Open Heavy Flavor Results from CMS For the CMS collaboration Heavy Quark Physics in Heavy-Ion Collisions ECT*, Trento, Italy 16-20 March, 2015 Relativistic Heavy Ion Collisions Trying to
More informationResults on heavy ion collisions at LHCb
Results on heavy ion collisions at LHCb Marcin Kucharczyk on behalf of LHCb collaboration HNI Krakow 28th Rencontres de Blois 29.05-03.06 2016 Outline LHCb - general purpose forward experiment Physics
More informationJet Reconstruction and Energy Scale Determination in ATLAS
Jet Reconstruction and Energy Scale Determination in ATLAS Ariel Schwartzman 3 rd Top Workshop: from the Tevatron to ATLAS Grenoble, 23-Oct-2008 1 Outline ATLAS Calorimeters Calorimeter signal reconstruction:
More informationFirst two sided limit on BR(B s µ + µ - ) Matthew Herndon, University of Wisconsin Madison SUSY M. Herndon, SUSY
First two sided limit on BR(B s µ + µ - ) Matthew Herndon, University of Wisconsin Madison SUSY 2011 M. Herndon, SUSY 2011 1 B s(d) µ + µ - Beyond the SM! Indirect searches for new physics! Look at processes
More informationTracker material study with the energy flow through the CMS electromagnetic calorimeter. Riccardo Paramatti, Ambra Provenza
Tracker material study with the energy flow through the CMS electromagnetic calorimeter Riccardo Paramatti, Ambra Provenza The electromagnetc calorimeter (ECAL) To detect photons and electrons iη=85 iη=1
More informationSearch for top squark pair production and decay in four bodies, with two leptons in the final state, at the ATLAS Experiment with LHC Run2 data
Search for top squark pair production and decay in four bodies, with two leptons in the final state, at the ATLAS Experiment with LHC Run data Marilea Reale INFN Lecce and Università del Salento (IT) E-mail:
More informationRecent CMS results on heavy quarks and hadrons. Alice Bean Univ. of Kansas for the CMS Collaboration
Recent CMS results on heavy quarks and hadrons Alice Bean Univ. of Kansas for the CMS Collaboration July 25, 2013 Outline CMS at the Large Hadron Collider Cross section measurements Search for state decaying
More informationThe CMS Experiment: Status and Highlights
: Status and Highlights for the CMS Collaboration CERN, INFN and University of Pisa CERN, European Organization for Nuclear Research CH-1211 Geneva 23, Switzerland Abstract We present the status of the
More information