Electron Isolation Performance
|
|
- Melanie Dickerson
- 6 years ago
- Views:
Transcription
1 Electron Isolation Performance LeBourgeois, Matthew 13th November, 2007
2 Table of Contents To date, have only shown muon isolation studies Definition of Electron Types Electron Reconstruction Electron Identification Tracker Based Isolation Methods Results Comparison to muons Calorimetry Based Isolation Methods Results Comparison to muons Summary p.2
3 Computing Details Samples are all CSA 07 simulated with 1_5_2 Ran with CMSSW_1_6_7 Drell-Yan (DY) /DrellYan_ll_40/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (800K events) QCD /QCD_Pt_15_20/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (880K events) /QCD_Pt_20_30/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (480K events) /QCD_Pt_30_50/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (54K events) /QCD_Pt_50_80/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (520K events) /QCD_Pt_80_120/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (720K events) /QCD_Pt_120_170/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (1,260K events) /QCD_Pt_170_230/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (450K events) /QCD_Pt_230_300/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (610K events) /QCD_Pt_300_380/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (1,270K events) /QCD_Pt_380_470/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (870K events) /QCD_Pt_470_600/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (1020K events) /QCD_Pt_600_800/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (410K events) /QCD_Pt_800_1000/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO (550K events) p.3
4 Definition of Electron Types For this talk, define different types of electrons Standard GSF Electrons label: pixelmatchedgsfelectrons Electrons with standard medium PTDR style ID* (Endcap,Barrel) x (Golden,BigBrem,Narrow,Showering) PTDR Medium Golden BigBrem Narrow Showering Variable Barrel Endcap Barrel Endcap Barrel Endcap Barrel Endcap EoverPInMax EoverPInMin deltaetain deltaphiin HoverE E9overE EoverPOutMax EoverPOutMin deltaphiout inveminusinvp bremfraction sigmaetaetamax sigmaetaetamin sigmaphiphimax sigmaphiphimin *e.g. Ribeiro, P.: p.4
5 Definitions continued Electrons with new loose Cut-Based (CB) style ID* (Endcap,Barrel)x (bremming w/ E/p ~ 1, low brem, bad track E/p!= 1) E/p E/p fbrem Δϕ in (E/p>1.5) Δη in CUTS Variable Barrel > 0.8 > 0.2 H/E < σ ηη < Δϕ in < 0.05 < 0.09 < E seed /p in > 0.11 Loose 1 Endcap > 0.8 > 0.2 < < < 0.07 < < > 0.8 > 0.2 < 0.09 *Sani, M.: > 0 Barrel < 0.10 < < < > 0.91 Loose 2 Endcap > 0.8 > 0.2 < 0.12 < < 0.03 < < > 0.85 Barrel > 0.8 > 0.2 < < < < 0.09 < > 0.11 fbrem = (p in - p out )/p in Loose 3 Endcap > 0.8 > 0.2 < < < < < > 0 p.5
6 Validating Electron Reconstruction First use of electrons, need to check efficiency, validate. Used a H(M=170) ZZ 4e sample One studies previous cuts: Previous Studies* Denominator: MC Electrons with a corresponding SC with E T > 5 GeV Numerator**: Associated Electron with: abs(δη) < E T (GeV) H/E < 0.1 ΔR in < 0.1 σ ηη < 0.03 && (σ ηη < abs(η) > 1.479) E/p out > 0.9 eta This Study E T (GeV) Global GSF Electrons GSF Electrons *see: **see: eta p.6
7 Validation by fake comparison Used /QCD_Pt_50_80/CMSSW_1_5_2-CSA /GEN-SIM-DIGI-RECO Almost same cuts: Denominator: SC with E T > 5 GeV Numerator**: Associated Electron with: abs(δη) < H/E < 0.1 ΔR in < 0.1 σ ηη < 0.03 && (σ ηη < abs(η) > 1.479) E/p out > 0.9 *Previous Studies E T (GeV) This Study E T (GeV) Similar shapes for efficiency and fake rates, can say that we are on the correct path, moving on eta Global GSF Electrons GSF Electrons eta *see: p.7
8 GSF Electrons in DY Sample Will look at electrons with P T > 15 GeV for this isolation study There is an excess of electrons not from the Z/γ* As well as contaminations from fakes difference comes mostly from τ s p.8
9 Electrons after selection New CB selection is more efficient in selecting electrons from Z s while still maintaining a better rejection for electrons in a QCD sample. p.9
10 Tracker Based Isolation p.10
11 Tracker Based Isolation Electrons leave a simple imprint in the tracker(unlike the ECAL) Tracker isolation is more stable in multiple interaction scenarios Electrons in the tracker are theoretically similar to muons minus the contribution from conversion, if any Track Requirements P T > 1 GeV d0 < 1 mm χ 2 / dof < 10 Hits Tracker >= 8 Δdz < 5 mm p.11
12 Contribution from Conversion Compare truth matched daughters of Z/γ* electrons and muons. If no contribution from conversion, should have exact same efficiency. Seems as if there is more <ΣP T > within a ΔR cone in electrons as compared to muons For 97% efficiency in the muon sample, can only achieve 96% for electrons when comparing MC truth matched leptons In real life: For 97.0% efficiency for Global Muons one can get just over 94% for CB Loose electrons CB Loose CB Loose p.12
13 Tracker Isolation Techniques 1. Use an inner and outer cone: Sum CTF Tracks between an inner and outer cone. Efficiency curves show smaller inner cone and an outer cone close to 0.3 Chose < ΔR < 0.3 for easy comparison to muons Inner Cone Comparison CB Loose Outer Cone Comparison CB Loose CB Loose p.13
14 Tracker Isolation Techniques 2. Veto CTF tracked matched to GSF Track Use match by hits algorithm (if the tracks shared > 50%, considered a match) ~98% efficiency of matching If no match, ΣP T unaffected (nothing to sum)! CB Loose p.14
15 Tracker Isolation Techniques 3. Try to minimize effects of e eγ, γ ee by vetoing all other electrons in the cone Use same ctf-gsf matching technique CB Loose p.15
16 Comparison of Techniques All methods perform similarly Inner veto cone is simplest, and already available other techniques depend on GSF-CTF matching (assoc. map?) p.16
17 Isolation Cut Variables Compare: Number of Tracks ΣP T ΣP T /P t e Σ(P T /P Te ) 2 Here, P T e is taken from 1_5_X GSF Electron definition of a 4-Vector CB Loose Notice the variation of ΣP T /P t e and Σ(P T /P Te ) 2 over P T ΣP T seems more robust p.17
18 Isolation vs P T ΣP T < 6 give ~97% efficiency for CB Loose Electrons Plot different types of leptons for this cut value: p.18
19 Summary and Recommendations For similar lepton purity, electron isolation performance almost as good as muon isolation performance conversion not a big issue ΣP T is more robust than ΣP T / P T e Lepton Type CB Loose PTDR Medium Muons DY ee Cut Efficiency (after reco) 98.5% 88.7% - QCD Cut Efficiency (after reco) 17.0% 28.4% Z ee is for MC electrons QCD is for all reco electrons - DY Isolation Efficiency 97.1% 96.6% QCD Isolation Efficiency 15% 14% Denominator: # Leptons Numerator: w/ ΣP T < 6 (GeV) p.19
20 Calo Based Isolation p.20
21 ECAL Based Methods Sum the E T of Island Basic Clusters (IBCs) within a ΔR cone using the following methods to veto the footprint of the electron: 1. Subtract out the raw SC energy very primitive still need to address issue of Hybrid Basic Clusters in the barrel what about pre-shower? Is there a better way? 2. Remove IBCs within a smaller cone around the position of the electron where it enters the calorimeter (the naïve approach) 3. Remove IBCs within a Δη strip around the position of the electron where it enters the calorimeter p.21
22 Prequel to Method 1 The isolation performance is very dependent on the Super Cluster algorithm performance. Unaccounted electron energy goes into the ΣE T Makes isolated electrons less isolated Is the same effect present in nonisolated electrons? Particle Gun Data Thanks to Matteo Sani: 10 GeV Generated 20 GeV Generated 30 GeV Generated GeV p.22
23 Method 1 Compare isolation in the barrel and endcap See that the barrel has a wider spread around 0. Due to summing IBC s while having hybrid SC s in the barrel Despite the BC mismatch, better isolation performance in the barrel than in the endcap. p.23
24 Method 1 Optimization Vary the outer cone to determine the best ΔR. Looks as if ΔR < 3.0 is large enough to contain the electron, whereas ΔR < 4.0 guarantees electron containment in the endcap. p.24
25 Method 2 Optimization Vary inner and outer cones to check efficiency Barrel Barrel Endcap Endcap Again, the endcap tends to need a larger ΔR, both for the inner and outer cones. p.25
26 Method 3 Optimization Vary outer cone and width of Δη strip Barrel Barrel Endcap Endcap p.26
27 Vetoed Energy Distributions Sum of the vetoed E T divided by the E T of the electron for each isolation technique Sharper peak for Method 1 Large tail to the right for Method 3 ΔR < 0.3 Strip: Δη > 0.03 Cone: ΔR > 0.07 Muons: ΔR > 0.07 DY QCD p.27
28 Barrel vs. Endcap Show all methods with comparison to muons Barrel ΔR < 0.3 Strip: Δη > 0.03 Cone: ΔR > 0.07 Muons: ΔR > 0.07 Nothing compares to muons, but Method 3 out performs Method 1. Endcap ΔR < 0.3 Strip: Δη > 0.03 Cone: ΔR > 0.07 Muons: ΔR > 0.07 p.28
29 HCAL Performance Used HCAL RecHits, with an outer and (possibly?) an inner cone. No sign of leakage. p.29
30 Combined performance Overall electrons have a poorer, but not bad, performance than muons. Some numbers (better presenation to come): 97% for DY Endcap, gives 12.3% QCD 97% for DY Barrel, gives 6.3% QCD ΔR < 0.3 ECAL Strip: Δη > 0.03 HCAL Cone: ΔR > 0 Tracker Cone: ΔR > ΔR < 0.3 ECAL Cone: Δη > 0.07 HCAL Cone: ΔR > 0.1 Tracker: Lepton Veto* p.30
A Update on Electron Isolation
A Update on Electron Isolation Matthew LeBourgeois Vivek Sharma UCSD Group Meeting 5th February, 2008 Table of Contents To date, have shown muon isolation studies http://indico.cern.ch/getfile.py/access?contribid=8&resid=0&materialid=slides&confid=20377
More informationNew Cut-Based Electron Id. Matteo Sani (UCSD) with collaborators from UCSD, UCSB, FNAL
New Cut-Based Electron Id Matteo Sani (UCSD) with collaborators from UCSD, UCSB, FNAL Introduction Electrons can be categories according to ECAL and tracker properties, two classification methods proposed
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 informationThis is not what we do anymore offline.
2 Isolation is really key to discriminating against jets. This is effectively requiring a small amount of additional activity surrounding your nicely contained small electromagnetic shower (see both clustering
More informationPerformance of BDTs for Electron Identification
Performance of BDTs for Electron Identification Hai-Jun Yang University of Michigan, Ann Arbor (with T. Dai, X. Li, A. Wilson, B. Zhou) ATLAS Egamma Meeting December 17, 2008 Motivation Lepton (e, μ, τ)
More informationDiscovery potential for SM Higgs with H ZZ (*) (*) 4l at CMS
Discovery potential for SM Higgs with H ZZ (*) (*) 4l at CMS Paolo Meridiani (INFN Roma1) on behalf of CMS collaboration Physics @ LHC 2006, Kracow, July 3 rd 2006 Paolo Meridiani - INFN Roma1 1 Introduction
More informationStudy of Quark compositeness in pp q * at CMS
Study of Quark compositeness in pp q * at CMS + Jets Brajesh Choudhary, Debajyoti Choudhury, Varun Sharma University of Delhi, Delhi Sushil Singh Chauhan, Mani Tripathi University of California, Davis
More informationApplication of the Tau Identification Capability of CMS in the Detection of Associated Production of MSSM Heavy Neutral Higgs Bosons Souvik Das
Application of the Tau Identification Capability of CMS in the Detection of Associated Production of MSSM Heavy Neutral Higgs Bosons Souvik Das Cornell University (September 11, 2006) Decays of the Tau
More informationElectron Identification
Chapter 7 Electron Identification The identification of electrons is of fundamental importance to the ATLAS physics program. Leptons are the primary signature of electro-weak processes. They are used in
More informationElectron Identification
Chapter 7 Electron Identification The identification of electrons is of fundamental importance to the ATLAS physics program. Leptons are the primary signature of electro-weak processes. They are used in
More informationMissing Transverse Energy. Performance with CMS
Missing Transverse Energy Performance with CMS Florent Lacroix (U. of Illinois at Chicago / Fermilab) on behalf of the CMS collaboration ArXiv:1106.5048 CMS DP-2011/010 EPS 2011 - Grenoble 1 The Missing
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 informationSearching for the Randall-Sundrum Graviton decay to dielectron pairs. Meghan Frate Bucknell University
Searching for the Randall-Sundrum Graviton decay to dielectron pairs Meghan Frate Bucknell University 1 The Project Look for evidence of the Randall- Sundrum Graviton using ee events at the LHC using the
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 informationIntroduction. Tau leptons. SLHC. Summary. Muons. Scott S. Snyder Brookhaven National Laboratory ILC Physics and Detector workshop Snowmass, Aug 2005
Leptons and Photons at the (S)LHC Scott S. Snyder Brookhaven National Laboratory ILC Physics and Detector workshop Snowmass, Aug 2005 Outline: Introduction. e/γ. Muons. Tau leptons. SLHC. Summary. Leptons
More informationSearch for an exotica particle µ (e ) in the µ(e) + γ channel in CMS detector at 10 TeV
Available on CMS information server CMS AN 9/xxx The Compact Muon Solenoid Experiment Analysis Note The content of this note is intended for CMS internal use and distribution only 4 April 9 Search for
More informationMeasurement of the Z ττ cross-section in the semileptonic channel in pp collisions at s = 7 TeV with the ATLAS detector
Measurement of the Z ττ cross-section in the semileptonic channel in pp collisions at s = 7 TeV with the ATLAS detector Sofia Consonni Università di Milano & INFN XCVII Congresso Nazionale della Società
More informationUpgrade of ATLAS Electron and Photon Triggers and Performance for LHC Run2
Upgrade of ALAS Electron and Photon riggers and Performance for LHC Run2 Ryan Mackenzie White (UFSM,Chile) on behalf of ALAS Collaboration NEC 2015 XXV International Symposium on Nuclear Electronics &
More informationTau Performance. ATLAS UK Physics Meeting. Alan Phillips University of Cambridge. ( on behalf of the Tau Working Group)
Tau Performance ATLAS UK Physics Meeting 9 th January 2008 Alan Phillips University of Cambridge ( on behalf of the Tau Working Group) 1 Overview I plan to cover the following topics as a sample of the
More informationHiggs-related SM Measurements at ATLAS
Higgs-related SM Measurements at ATLAS Junjie Zhu University of Michigan 2 nd MCTP Spring Symposium on Higgs Boson Physics Outline Introduction Isolated γγ cross section (37 pb -1, Phys. Rev. D 85, 012003
More informationATLAS Calorimetry (Geant)
signature for New Physics (e.g. compositness, jet multiplicity in SUSY) high of E miss in LHC physics: Importance used in invariant mass reconstruction in decays neutrinos: A=H! fifi, t! lνb, etc. involving
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 informationEGAMMA HLT. Marco Pieri. UCSD Meeting 12 June 2007
EGAMMA HLT Marco Pieri UCSD Meeting 12 June 2007 Introduction For low luminosity 2x10 33 cm -2 s -1 : We assume a Level1 trigger rate of 50 khz We apply a safety factor of 3 and set the L1 rate at 17 khz
More informationStandard Model physics with taus in ATLAS
Standard Model physics with taus in ATLAS IFJ PAN, Cracow, Poland Why we are interested in taus? Tau leptons play an important role in the physics program of the ATLAS experiment as they are tools in many
More informationAtlas Status and Perspectives
Atlas Status and Perspectives Bruno Mansoulié (IRFU-Saclay) On behalf of the Topics The hot news: Heavy Ion analysis Data taking in 2010 Luminosity, Data taking & quality, trigger Detector performance
More informationLHC Physics GRS PY 898 B8. Lepton IdenHficaHon
LHC Physics GRS PY 898 B8 Lecture #6 Tulika Bose Feb. 23 rd, 2009 Lepton IdenHficaHon Seminar Schedule Seminars this week Special day and room: PRB 261, Wednesday 4:00 5:00 PM References Hadron Collider
More informationFeasibility of a cross-section measurement for J/ψ->ee with the ATLAS detector
Feasibility of a cross-section measurement for J/ψ->ee with the ATLAS detector ATLAS Geneva physics meeting Andrée Robichaud-Véronneau Outline Motivation Theoretical background for J/ψ hadroproduction
More informationCALICE scintillator HCAL
CALICE scintillator HCAL Erika Garutti DESY (on behalf of the CALICE collaboration) OUTLINE: electromagnetic and hadronic shower analysis shower separation The test beam prototypes 10 GeV pion shower @
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 informationSearch for high mass resonances in the diphoton and Zγ channels at LHC
Search for high mass resonances in the diphoton and Zγ channels at LHC Matteo Bauce, Riccardo Paramatti Univ. Sapienza & INFN Roma Diphoton and flavor anomalies 23 rd May 2016 LHC Run2 started one year
More informationThe rejection of background to the H γγ process using isolation criteria based on information from the electromagnetic calorimeter and tracker.
Available on CMS information server CMS NOTE 22/3 The Compact Muon Solenoid Experiment CMS Note Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland September 9, 22 The rejection of background to
More informationHow to Measure Top Quark Mass with CMS Detector??? Ijaz Ahmed Comsats Institute of Information Technology, Islamabad
How to Measure Top Quark Mass with CMS Detector??? Ijaz Ahmed Comsats Institute of Information Technology, Islamabad Outlines o o o o o o o High Pt top basic idea Methods for jets selection Top quark mass
More informationA Search for Doubly Charged Higgs Production at 8 TeV Using the CMS Detector at the LHC
A Search for Doubly Charged Higgs Production at 8 TeV Using the CMS Detector at the LHC 1 UW-Madison Preliminary Examination Outline The Standard Model Doubly Charged Higgs Motivation Type II Seesaw Mechanism
More informationFrom RAW data to the Higgs and beyond. Physics Object ID, Analyses techniques, Higgs results and future prospects. M.
From RAW data to the Higgs and beyond Physics Object ID, Analyses techniques, Higgs results and future prospects M.Bachtis (CERN-PH) Outline of the lectures Part I Experimental signatures of Higgs events
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 informationProspect for WW Study with Early ATLAS Data
Prospect for WW Study with Early ATLAS Data N. Vranješ, Lj. Simić, D.S.Popović ATLAS@Institute of Physics Motivation and WW production at LHC Event reconstruction and selection WW production measurement
More informationATLAS-CONF October 15, 2010
ATLAS-CONF-2010-096 October 15, 2010 Data-driven background estimation for the H τ + τ τ h search at 7 TeV with the ATLAS detector Ian Howley 7 December 2010 1 Motivation One of the primary LHC physics
More informationTop Physics in Hadron Collisions
Top Physics in Hadron Collisions Dirk Dammann DESY 2010-02-04 1 / 44 Outline 1 2 3 4 2 / 44 Outline Motivation Top Production Top Decay Top Physics 1 Motivation Top Production Top Decay Top Physics 2 3
More informationCMS Trigger Simulation
CMS Trigger Simulation Sridhara Dasu University of Wisconsin Outline: Calorimeter Level- Trigger Algorithms Rates and Efficiencies Physics Performance Muon Level- Trigger Algorithms Rates and Efficiencies
More informationElectroweak Physics at the Tevatron
Electroweak Physics at the Tevatron Adam Lyon / Fermilab for the DØ and CDF collaborations 15 th Topical Conference on Hadron Collider Physics June 2004 Outline Importance Methodology Single Boson Measurements
More informationTriggering on Long-lived neutral particles in ATLAS
Triggering on Long-lived neutral particles in ATLAS Our theoretical friends tell us that many extensions of the Standard Model that address the hierarchy problem contain new sectors These new sectors decouple
More informationPerformance of the CMS electromagnetic calorimeter during the LHC Run II
Beijing, China May 5, 7 Performance of the CMS electromagnetic calorimeter during the LHC Run II Chia Ming, Kuo National Central University, Taiwan on behalf of the CMS Collaboration ECAL is crucial in
More informationJet reconstruction in LHCb searching for Higgs-like particles
Jet reconstruction in LHCb searching for Higgs-like particles Alessandro Camboni (on behalf of LHCb Collaboration) DISCRETE'08 Valencia Dec 12th, 2008 Motivation Jet reconstruction is important for searches
More informationTevatron Non-SUSY BSM: Searches for Physics Beyond the SM and MSSM. David Stuart University of California, Santa Barbara. DIS 2007, Munich April 2007
Tevatron Non-SUSY BSM: Searches for Physics Beyond the SM and MSSM David Stuart University of California, Santa Barbara DIS 2007, Munich April 2007 Outline There are two categories of searches: 1. Model
More informationSeminario finale di dottorato
Seminario finale di dottorato Search for new physics in dielectron and diphoton final states at CMS 17/05/2017 Giuseppe Fasanella La Sapienza University of Rome & INFN Roma 1 Co-supervision with ULB Université
More informationExpected Performance of the ATLAS Inner Tracker at the High-Luminosity LHC
Expected Performance of the ATLAS Inner Tracker at the High-Luminosity LHC Matthias Hamer on behalf of the ATLAS collaboration Introduction The ATLAS Phase II Inner Tracker Expected Tracking Performance
More informationHiggs Boson at the CMS experiment
16 th Lomonosov Conference on Elementary Particle Physics 22 28 August 2013, Moscow (Russia) Higgs Boson at the CMS experiment Somnath Choudhury (for the CMS collaboration) 5.1 fb -1 @ 7 TeV + 5.3 fb -1
More informationA Particle Flow Algorithm with hit density driven clustering. Lei Xia
A Particle Flow Algorithm with hit density driven clustering Lei Xia ANL-HEP About this PFA What s in it Calibration of calorimeter (independent of PFA) including Ron s angular correction Clustering algorithm
More informationBSM Higgs in ATLAS and CMS
BSM Higgs in ATLAS and CMS A.-M. Magnan Imperial College London 11/01/2012, BSM 4 LHC UK Workshop A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/2012 1 / 32 Introduction Extensions to Standard Model:
More informationTau Lepton Reconstruction in ATLAS. Tau 2016 Conference, Beijing, 21st September 2016
Tau Lepton Reconstruction in ATLAS Tau 2016 Conference, Beijing, 21st September 2016 Cristina Galea Nikhef/RU Nijmegen presented by: Daniele Zanzi University of Melbourne Tau lepton properties Mass = 1.78
More informationHL-LHC Physics with CMS Paolo Giacomelli (INFN Bologna) Plenary ECFA meeting Friday, November 23rd, 2012
@ HL-LHC Physics with CMS Paolo Giacomelli (INFN Bologna) Plenary ECFA meeting Friday, November 23rd, 2012 Many thanks to several colleagues, in particular: M. Klute and J. Varela Outline Where we stand
More informationPoS(DIS 2010)190. Diboson production at CMS
(on behalf of the CMS collaboration) INFN-Napoli & University of Basilicata E-mail: fabozzi@na.infn.it We present an analysis strategy based on Monte Carlo simulations for measuring the WW and WZ production
More informationPerformance of electron reconstruction and selection with the CMS detector in proton-proton
Home Search Collections Journals About Contact us My IOPscience Performance of electron reconstruction and selection with the detector in proton-proton collisions at s = 8 ev his content has been downloaded
More informationSearch for the Higgs Boson In HWW and HZZ final states with CMS detector. Dmytro Kovalskyi (UCSB)
Search for the Higgs Boson In HWW and HZZ final states with CMS detector Dmytro Kovalskyi (UCSB) Introduction WW and ZZ finals states dominate Higgs searches at Higgs Mass WW 2L2ν has best sensitivity
More informationFirst V+jets results with CMS. Vitaliano Ciulli (Univ. & INFN Firenze) V+jets workshop, 8-10 Sep 2010, Durham
First V+jets results with CMS Vitaliano Ciulli (Univ. & INFN Firenze) V+jets workshop, 8- Sep 20, Durham Outline Jet and missing energy reconstruction W and Z selections and cross-section measurement First
More informationParticle Flow Algorithms
Particle Flow Algorithms Daniel Jeans, KEK IAS Program on High Energy Physics HKUST Hong Kong January, 2018 introduction and motivation bias towards e+ e- collisions general features of detectors and reconstruction
More informationCMS: Muon System and Physics performance
VI symposium on LHC Physics and Detectors Fermilab, Batavia, Il, U.S., may, 2003 CMS: Muon System and Physics performance Stefano Lacaprara, I.N.F.N. and Padova University on behalf of the CMS collaboration
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 informationSearch for long-lived particles at CMS. TeVPA Brian Francis for the CMS Collaboration
Search for long-lived particles at CMS TeVPA 7 Brian Francis for the CMS Collaboration Long-lived particles (LLP) at CMS Despite best efforts, no evidence yet of BSM physics at the LHC If it s not where
More informationElectroweak results. Luca Lista. INFN - Napoli. LHC Physics
Electroweak results Luca Lista INFN - Napoli EWK processes at LHC p p W and Z production in pp collisions proceeds mainly form the scattering of a valence quark with a sea anti-quark The involved parton
More informationHigh P T Tau Analysis
High P T Tau Analysis Muon + Tau : First Look @ Data Alfredo Gurrola (Texas A&M) Dec 15 th 2010 First look at data First half of the talk a few of the main N-1 distributions mainly for discussion what
More informationHigh Pt Top Quark Mass Reconstruction in CMS
High Pt Top Quark Mass Reconstruction in CMS IJAZ AHMED National Centre for Physics (NCP), Islamabad First IPM meeting on LHC Physics, April 20-24 24 2009 Isfahan,, Iran Outlines o o o o o o o o o o Introduction
More informationSeaches fo log-lived paticles with displaced signatues at the LHC. Daniela Salvatore (INFN Cosenza) on behalf of the ATLAS and CMS Collaborations
Seaches fo log-lived paticles with displaced signatues at the LHC Daniela Salvatore (INFN Cosenza) on behalf of the ATLAS and CMS Collaborations Outline A review of the most recent results from ATLAS &
More informationThe Fake Factor Method
Chapter 9 he Fake Factor Method Misidentification is an important source of background for physics analyses using particle-level identification criteria. In the case of the di-lepton analyses presented
More informationMatt Nguyen Rencontres QGP-France September 13 th, 2013
Matt Nguyen Rencontres QGP-France September 13 th, 2013 Review of jets in heavy ions 2 The Usual Disclaimers Not a comprehensive review, rather mostly a summary of experimental talks at July Jussieu workshop*
More informationSearch for the Standard Model Higgs Boson in H WW lν lν with the ATLAS experiment
Search for the Standard Model Higgs Boson in H WW lν lν with the ATLAS experiment MCTP Symposium 2012, University of Michigan, Ann Arbor, US Outline SM Higgs Boson production and decay Analysis based on
More informationDiscovery of the W and Z 0 Bosons
Discovery of the W and Z 0 Bosons Status of the Standard Model ~1980 Planning the Search for W ± and Z 0 SppS, UA1 and UA2 The analyses and the observed events First measurements of W ± and Z 0 masses
More informationATLAS: Status and First Results
ATLAS: Status and First Results, University of Sheffield, on behalf of the ATLAS Collaboration 1 Overview of the ATLAS detector Status of the experiment Performance and physics results in the first six
More informationPhysics object reconstruction in the ATLAS experiment
Physics object reconstruction in the ALAS experiment, on behalf of the ALAS Collaboration Niels Bohr Institute, Copenhagen University Blegdamsvej 7, Denmark E-mail: xella@nbi.dk his document presents a
More informationReconstruction and identification of hadronic τ decays with ATLAS
Reconstruction and Identification of Hadronic τ Decays with ATLAS Wolfgang F. Mader 1 1 Institut für Kern- und Teilchenphysik TU Dresden DPG Frühjahrstagung München, March 2009 Outline 1 Introduction 2
More informationCMS Trigger Simulation Sridhara Dasu University of Wisconsin
CMS Trigger Simulation Sridhara Dasu University of Wisconsin Outline: Calorimeter Level- Trigger Algorithms Rates and Efficiencies Muon Level- Trigger Algorithms Rates and Efficiencies Combined Rates Physics
More informationMET+multijet search beyond the PTDR
MET+multijet search beyond the PTDR SUSY Meeting 28-05-08 Christopher Rogan California Institute of Technology w/ VecBos + Jets group Introduction All Hadronic + MET final state PTDR analysis in CMSSW
More informationParticle Identification of the LHCb detector
HCP 2005 Particle Identification of the LHCb detector Ann.Van.Lysebetten@cern.ch on behalf of the LHCb collaboration CERN 5th July 2005 The LHCb experiment : introduction precision measurements of CP violation
More informationSearch for the SM Higgs Boson in H γγ with ATLAS
Search for the SM Higgs Boson in H γγ with Heberth Torres, LPNHE - Paris on behalf of the Collaboration Second MCTP Spring Symposium on Higgs Boson Physics University of Michigan 17/4/1 1 Introduction
More informationCollider Physics Analysis Procedures
Collider Physics Analysis Procedures Alex Tapper Slides available at: http://www.hep.ph.ic.ac.uk/~tapper/lecture.html Aim Overview of analysis techniques at CMS Contrast with Tevatron (see DØ lecture)
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 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 informationSEARCH FOR THE HIGGS BOSON IN
SEARCH FOR THE HIGGS BOSON IN THE CHANNEL H γγ Universita Sapienza & INFN Rome H γγ Light Higgs favored by precision electroweak tests H γγ one of the most sensiave channels at low masses despite the small
More informationAnalyses with photons or electrons with early LHC data at the CMS experiment
Analyses with photons or electrons with early LHC data at the CMS experiment Dottorando: Daniele Franci Relatori: Prof. Egidio Longo Dott. Daniele del Re Prof. Shahram Rahatlou Seminario progetto di tesi,
More informationSearch for high mass diphoton resonances at CMS
Search for high mass diphoton resonances at CMS 51st Rencontres de Moriond Electroweak session Thursday 17th 2016, La Thuile (Italy) Pasquale Musella (ETH Zurich) on behalf of the CMS collaboration Motivation
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 informationStudies on Higgs Mass Resolutions and Mass Fitting with Four-lepton Final States with the ATLAS Experiment
Studies on Higgs Mass Resolutions and Mass Fitting with Four-lepton Final States with the ATLAS Experiment Yutong Pan April 2, 2013 Abstract This thesis presents the mass resolution and measurement of
More informationEfficient Implementation of High- Energy Physics Processing Using Modified Jet Reconstruction and Active Size Partitioning
Efficient Implementation of High- Energy Physics Processing Using Modified Jet Reconstruction and Active Size Partitioning Tony Gregerson University of Wisconsin Tony Gregerson, U. Wisconsin, 13 April
More informationLa ricerca dell Higgs Standard Model a CDF
La ricerca dell Higgs Standard Model a CDF Melisa Rossi INFN-TS Giornata di seminari INFN Trieste - 7 Luglio 2009 FNAL: Fermi National Accelerator Lab Tevatron currently provides the highest energy proton-antiproton
More informationarxiv: v1 [hep-ex] 24 Jul 2011
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH (CERN) CERN-PH-EP/2011-7 2011/07/26 -EWK--00 Measurement of the Inclusive W and Z Production Cross Sections in pp Collisions arxiv:17.4789v1 [hep-ex] 24 Jul 2011
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 informationCMS Note Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland
Available on CMS information server CMS NOTE 21/17 The Compact Muon Solenoid Experiment CMS Note Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland 2 March 21 Study of a Level-3 Tau Trigger with
More informationTau Reconstruction at CMS. Evan Friis
Tau Reconstruction at CMS Evan Friis Outline Taus at hadron colliders Tau ID algorithms at CMS Tau ID measurements in 2010 Z ττ standard candle SVfit: τ pair mass reconstruction MSSM H ττ Tau ID at hadron
More informationarxiv: v1 [hep-ex] 6 Jul 2007
Muon Identification at ALAS and Oliver Kortner Max-Planck-Institut für Physik, Föhringer Ring, D-005 München, Germany arxiv:0707.0905v1 [hep-ex] Jul 007 Abstract. Muonic final states will provide clean
More informationSearches using displaced leptons or jets
Searches using displaced leptons or jets J Antonelli with input from M Flowerdew, P Pais, R Rosten, H Russell I ve spoken with authors from ~all of the relevant searches, here are some general musings
More informationSM and jet measurements at the LHC
SM and jet measurements at the LHC Andy Pilkington IPPP and Manchester Presented at the Young Experiment and Theory Ins7tute, Durham, January 2011 Part I jet characteris.cs 1) Introduc?on to ATLAS and
More informationGET STARTED ON THE WEB WITH HYPATIA AND OPloT
GET STARTED ON THE WEB WITH HYPATIA AND OPloT You will now analyze up to 50 particle collisions (events) by using the visualization application HYPATIA. From these collisions, you shall try to find the
More informationHiggs search prospects at LHC
Higgs search prospects at LHC Rebeca González Suárez IFCA On behalf of the ATLAS and CMS Collaborations 26 June 2010 BEACH 2010 - IX International Conference on Hyperons, Charm and Beauty Hadrons University
More informationATLAS Searches for Higgs Bosons Beyond the Standard Model
ATLAS Searches for Higgs Bosons Beyond the Standard Model Trevor Vickey University of the Witwatersrand, South Africa University of Oxford, United Kingdom on behalf of the ATLAS Collaboration July 28,
More informationSearch for the SM Higgs boson in the decay channel H ZZ ( * ) 4l in ATLAS
Search for the SM Higgs boson in the decay channel H ZZ ( * ) 4l in ATLAS Luis R Flores Castillo University of Wisconsin-Madison On behalf of the ATLAS Collaboration Higgs Hunting 2012 July 19, 2012 Orsay
More informationCalo-objects for the upgrade (Dec. 2017)
Calo-objects for the upgrade (Dec. 2017) Overview Run III: higher pile-up, no SPD/PS Description of current calo software sequences Review of previous work (Upgrade PID TDR) Alternative cluster shapes
More informationRecent Results on New Phenomena and Higgs Searches at DZERO
Recent Results on New Phenomena and Higgs Searches at DZERO Neeti Parashar Louisiana Tech University Ruston, Louisiana U.S.A. 1 Outline Motivation for DØ Run II Detector at Fermilab The Fermilab Tevatron
More informationHigh-pT lepton final states at 13 TeV (W and Z searches)
High-pT lepton final states at TeV (W and Z searches) James Catmore (University of Oslo, Norway) on behalf of the ATLAS and CMS Collaborations 5st Rencontres de Moriond EW 06 W and Z Many BSM models predict
More informationTau trigger and identification at CMS in Run-2
Tau trigger and identification at CMS in Run-2 Olivier DAVIGNON*, for the CMS Collaboration * Laboratoire Leprince-Ringuet (École Polytechnique / CNRS-IN2P3) The 14th International Workshop on Tau Lepton
More informationParticle ID in ILD. Masakazu Kurata, KEK Calorimeter Workshop IAS program 01/19/2018
Particle ID in ILD Masakazu Kurata, KEK Calorimeter Workshop IAS program 01/19/2018 1 Outline Introduction Requirement of the TPC for the ILD de/dx of ILD TPC Requirement of the Calorimeters for the ILD
More information