effect of muon misalignments on muon p t resolution and on the search for z' ssm → µ + µ -...
TRANSCRIPT
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Effect of muon misalignments Effect of muon misalignments
on muon pon muon pTT resolution and on resolution and on
the search for Z'the search for Z'SSM SSM → µ→ µ++µµ--
using 7 TeV MC samplesusing 7 TeV MC samples
Samir Guragain, Marcus Hohlmann Florida Tech
Exotica meetingThesis endorsement
August 3, 2010
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CMS AN-2010/064CMS AN-2010/064
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 2
From the beginning to the final results of the note, they were presented at the following meetings:
TeVMu 07/23/09 Preliminary work & plans on studying alignment systematics
http://indico.cern.ch/contributionDisplay.py?contribId=0&confId=64916
Muon POG WG 08/20/09 Status of alignment systematics study
http://indico.cern.ch/contributionDisplay.py?contribId=0&sessionId=1&confId=66502
Muon Alignment 09/18/09 Alignment studies for Z′→μ+ μ− search
http://indico.cern.ch/contributionDisplay.py?contribId=6&confId=68513
EXO-MU 10/15/09 Alignment Systematics Study
http://indico.cern.ch/contributionDisplay.py?contribId=3&confId=70813
EXO-MU 10/29/09 Updates on Alignment systematics
http://indico.cern.ch/contributionDisplay.py?contribId=0&confId=72297
EXO-MU 11/12/09 Update on Alignment Systematics wrt Ideal Alignment
http://indico.cern.ch/contributionDisplay.py?contribId=3&confId=73809
MU align 11/20/09 Alignment systematics w.r.t. ideal alignment scenario
http://indico.cern.ch/contributionDisplay.py?contribId=6&confId=74620
EXO-MU 01/28/10 Updates on resolution from Z'→μ+ μ− analysis
http://indico.cern.ch/contributionDisplay.py?contribId=5&confId=82293
EXO-MU 03/11/10 First Results from Mass Reach Analysis for
MZ′SSM = 1.2 TeV using 7 TeV MC samples
http://indico.cern.ch/contributionDisplay.py?contribId=7&confId=87444
EXO-Resonances 06/11/10 Effect of muon misalignments on muon pT resolution and on the search for Z′→ μ+ μ−
http://indico.cern.ch/contributionDisplay.py?contribId=7&confId=97968
EXO-Resonances 06/25/10 Update on search for Z'→ μ+ μ− (2)
http://indico.cern.ch/contributionDisplay.py?contribId=5&confId=99443
Endorsed by EXO resonances convener, Meenakshi Narain
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OverviewOverview• 50K event samples for Z′SSM & Drell-Yan at √s=7 TeV with 3 different
alignment scenarios using CMSSW_3_1_X
• The effect of muon misalignment on transverse momentum resolution for muons and the dimuon mass resolution for various scenarios
• Z′ Mass Reach analysis for MZ′SSM= 1.0 TeV/c2 & 1.2 TeV/c2
– Mass spectra w.r.t. different alignment scenarios• Generated vs. reconstructed (Global)
– Signal Significance with different Muon+Tracker alignments and integrated luminosities
– Signal Significance with different Muon Endcap misalignment systematics
– Comparison of results with official MC samples
• My first look at the collision data and dimuon data analysisAugust 3, 2010 3Exotica meeting (Thesis endorsement), S. Guragain
All analysis is performed with the “Zprime2muAnalysis” (no PATTuple) package[Thanks to Jordan Tucker, UCLA group, and Piotr Traczyk]
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Alignment scenarios and Alignment scenarios and corresponding global tagscorresponding global tags
• IDEAL (MC_31X_V5) : Ideal geometry of the detector • STARTUP (STARTUP31X_V4): Based on CRAFT 2008 and
2009 data analysis for early phase and produced by randomly misaligning chambers with an RMS consistent with cross-checks Uncertainty in chamber positions:
0.05 cm – 0.60 cm in (x,y,z) & 0.3 mrad – 2.3 mrad in (φx,φy,φz)
• 50 pb-1 (50PBMU31X_V1) : Assuming an alignment with tracks using 50 pb-1 data and produced by running the Reference-Target algorithm on MC samples
Uncertainty in chambers:
0.05 cm – 0.18 cm (x,y,z) & 0.3 mrad – 0.6 mrad (φx,φy,φz)
Tracker misalignment scenarios in startup and 50 pb-1 are the same and based on CRAFT 2008 (tag TrackerCRAFTScenario310_mc)
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 4
Thanks to Jim Pivarski
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MC samples and MC samples and event selectionevent selection
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 5
MC samples• Z′ signal samples with full Z′/Z/γ interference for
MZ′SSM=1.0 TeV/c2, 1.2 TeV/c2, 1.3 TeV/c2, and 2.0 TeV/c2
• Drell-Yan samples, one in the mass region (>500 GeV/c2) around the Z′ mass and another at lower mass(>200 GeV/c2)
Event selection:• At least a pair of oppositely charged muons
• pT of each muon track in a pair > 20 GeV/c
• Isolated muons: Σ track pT (ΔR < 0.3) < 10 GeV/c
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Resolution study for 3 alignment scenarios Resolution study for 3 alignment scenarios using 1.2 TeV Zusing 1.2 TeV Z′′ MC sample at MC sample at √s = 7TeV√s = 7TeV
August 3, 2010 6Exotica meeting (Thesis endorsement), S. Guragain
Muon Momentum resolution (endcap)
for 3 misalignment scenarios with
MZ′ = 1.2 TeV at 7 TeV CM energy
Z'SSM → µ+ µ- analysis
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Summary: resolutions for 3 alignmentsSummary: resolutions for 3 alignmentsand different Zand different Z′′ mass with mass with √s=7TeV & 10TeV√s=7TeV & 10TeV
August 3, 2010 7Exotica meeting (Thesis endorsement), S. Guragain
50 pb-1 alignment scenario is validated.
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Systematics study:Systematics study:Muon endcap alignment Muon endcap alignment
Method:
1.Muon Endcap was misaligned with respect to ideal or startup muon geometry.
2.A signal sample (MZ′=1.2TeV/c2 or 2.0TeV/c2) was fully reconstructed. – The sample was reconstructed with a customized global tag
by inputting a modified SQLite file, with a bias for the position(XCMS, YCMS, ZCMS) up to 2 mm or a bias on rotation (φZ
CMS) up to 0.5 mrad of muon endcap stations together or
individual ME stations. [For comparison: Current startup ME disk misalignments are 0.5 - 1.0 mm in (∆x, ∆y, ∆z) & 0.1 mrad in ∆φZ
CMS]
3. The analysis code was re-run over the resulting biased MC data set for each misalignment.
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 8
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ppTT resolution vs. resolution vs. ηηIdeal alignement & with 2mm BiasIdeal alignement & with 2mm Bias
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 9
2 TeV Z′ Sample
2 TeV Z′ Sample
No systematic bias applied to the Barrel and Tracker-only
Ideal alignment
Ideal alignment + 2mm shift of muon endcaps
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Comparison: pComparison: pTT resolution resolution
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 10
• Up to 200 GeV/c, no significant change due to bias but changes at higher pT
• Muon alignment becomes prominent at higher pT in all scenarios
• Demonstrates tracker-only does not change, as expected with or without bias on endcap stations
Ideal alignment + 2mm shift of muon endcap
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August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 11
Alignment Systematics Study: Alignment Systematics Study: Bias on ideal Endcap positionsBias on ideal Endcap positions
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Alignment Systematics Study: Alignment Systematics Study: Bias on startup Endcap positionsBias on startup Endcap positions
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 12
Asymmetric results
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MC Mass SpectraMC Mass Spectra
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 13
Ideal alignment(MC_31X_V5)
50 pb -1 alignment (50PBMU31X_V1)
Startup alignment(STARTUP31X_V4)
Generated and reconstructed dimuon mass with 3 alignment scenarios
MZ′ = 1.2 TeV
Better aligned detector narrows the signal peak; eg from startup to 50 pb -1
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ZZ′ ′ Mass Reach AnalysisMass Reach Analysis
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 14
Z′ signal sample with full Z′/Z/γ interference, reconstructed with startup alignment ; and the background samples, one in the mass region (> 500 GeV/c2) around the Z′ mass and the other at lower mass (>200 GeV/c2).
For the analysis, the reconstructed background sample is the weighted sum of these 2 background datasets.
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Reconstructed Mass fits: Reconstructed Mass fits: Significance with 200pbSignificance with 200pb-1-1
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 15
Likelihood-ratio estimator has been used to evaluate the significance
STARTUP align.
MZ′ = 1.2 TeV & 200pb-1
MZ′ = 1.2 TeV & 200pb-1
50 pb -1 align.
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Signal significance vs. Signal significance vs. LLintint
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 16
Variation of signal significance for MZ′ = 1.0 TeV/c2 and 1.2 TeV/c2 for different alignments and integrated luminosities.
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Int. luminosity for 5Int. luminosity for 5σσ
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 17
Estimated data required for the expected Z′ signal with 5σ
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August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 18
Negligible effect
ZZ′ signal significance with ′ signal significance with misaligned muon endcaps onlymisaligned muon endcaps only
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Mass spectra & Signal significance Mass spectra & Signal significance with 7 TeV official MC samples*with 7 TeV official MC samples*
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 19
STARTUP Alignment
MZ’ =1000 GeV/c2MZ’ = 1250 GeV/c2
STARTUP Alignment
MZ′ = 1000 GeV/c2
STARTUP align.
MZ′ = 1250 GeV/c2
STARTUP align.
* Samples on backup slide
Signal significance
Following the convener’s request at the June 11 resonance meeting, we have also analyzed recent Z′ and DY official MC samples
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Comparisons (I)Comparisons (I)
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 20
MZ′ = 1000 GeV/c2
STARTUP align.(START3X_V26)
Privately generated samples Official samples
MZ′ = 1000 GeV/c2
STARTUP align.(STARTUP31X_V4)
Full interference (Z ′ /Z/γ ) sampleSTARTUP (randomly misaligned chamber positions with an RMS)
Z′ signal onlyMC generated STARTUP (running Reference-Target algorithm)
500 pseudo-experiments with Lint = 200 pb-1 each
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Comparisons (II)Comparisons (II)
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 21
Signal significance vs. Lint Int. luminosity for 5σ
Compatible results
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7 TeV collision data analysis7 TeV collision data analysisDatasets: (pre-ICHEP 2010)
1. /MinimumBias/Commisioning10-CS_Onia-Jun14thSkim_v1/RAW-RECO– Run range 131511-135802, 135740 events
2. /Mu/Run2010A-CS_Onia-jun14thSkim_v1/RAW-RECO– Run range 135821-137436, 79833 events
3. /Mu/Run2010A-PromptReco-v4/RECO– Run range 137437-140399 (July 19),
Event selections:• Official good runs & lumisections certified from DQM group (Cert_132440-140399_7TeV_StreamExpress_Collisions10_JSON.txt)
• Scraping filter to remove monster events (beam background rejection requiring ≥ 25% of high purity tracks
• Primary vertex (not fake) with at least 4 tracks (ndof ≥ 4) with |Z| ≤ 15 cm &&
position.Rho ≤ 2 cm
1. Two opposite sign muons with pT > 1 GeV/c (Std. 20 GeV/c)
2. Isolation Σ track pT (ΔR < 0.3 ) < 10 GeV/c
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 22
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Dimuon mass spectraDimuon mass spectra
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 23
Z
J/ψ
Events
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ConclusionsConclusions• Samples for MZ′ = 1.0 TeV, 1.2 TeV, 1.3 TeV, & 2 TeV and Drell-Yan at √s=7 TeV with the ideal,
startup & 50 pb-1 alignment scenarios are generated, analyzed and published in CMS Database Bookkeeping System [hosted by FLTECH T3].
• The transverse momentum (pT) resolutions and dimuon mass resolutions are studied for various scenarios with the aforementioned samples. Typical dimuon mass resolutions are ~3% for ideal (MC), 6% for 50 pb-1 & 10% for startup.
• The muon pT resolution in Endcaps is sensitive to the disk misalignment in position as well as rotation and the resolution is quantified for various misalignment scenarios.
• Simulation results for discovery potential for MZ′SSM= 1.0 TeV & 1.2 TeV with different muon
alignments and integrated luminosities are studied.– Effect of muon (mis)alignment on mass spectra– Expect to observe the Z′ (M = 1.2 TeV) with 5σ significance at √s=7 TeV and integrated luminosity of
250pb-1 with the 50pb-1 alignment or better– Negligible effect of muon endcap (only) misalignments upto 2 mm in translation or 0.5 mrad in
rotation on Z′ signal significance
Analyzed 7 TeV official MC samples, compared Z′ signal significances, and found compatible results.
Looked and analyzed 7 TeV collision data (dimuon) up to run 140399 (July 19, 2010)
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain 24
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Seeking Ph.D. thesis endorsement: Seeking Ph.D. thesis endorsement: CMS AN-2010/064 CMS AN-2010/064
From the beginning to the final results of the note: TeVMu 07/23/09 Preliminary work & plans on studying alignment
systematics
http://indico.cern.ch/contributionDisplay.py?contribId=0&confId=64916
Muon POG WG 08/20/09 Status of alignment systematics study
http://indico.cern.ch/contributionDisplay.py?contribId=0&sessionId=1&confId=66502
Muon Alignment 09/18/09 Alignment studies for Z′ →μ+ μ− search
http://indico.cern.ch/contributionDisplay.py?contribId=6&confId=68513
EXO-MU 10/15/09 Alignment Systematics Study
http://indico.cern.ch/contributionDisplay.py?contribId=3&confId=70813
EXO-MU 10/29/09 Updates on Alignment systematics
http://indico.cern.ch/contributionDisplay.py?contribId=0&confId=72297
EXO-MU 11/12/09 Update on Alignment Systematics wrt Ideal Alignment
http://indico.cern.ch/contributionDisplay.py?contribId=3&confId=73809
MU align 11/20/09 Alignment systematics w.r.t. ideal alignment scenario
http://indico.cern.ch/contributionDisplay.py?contribId=6&confId=74620
EXO-MU 01/28/10 Updates on resolution from Z‘→ μ+ μ− analysis
http://indico.cern.ch/contributionDisplay.py?contribId=5&confId=82293
EXO-MU 03/11/10 First Results from Mass Reach Analysis for
MZ′SSM = 1.2 TeV using 7 TeV MC samples
http://indico.cern.ch/contributionDisplay.py?contribId=7&confId=87444
EXO-Resonances 06/11/10 Effect of muon misalignments on muon pT resolution and on the search for Z' → μ+ μ−
http://indico.cern.ch/contributionDisplay.py?contribId=7&confId=97968
EXO-Resonances 06/25/10 Update on search for Z' →μ+ μ− (2)
http://indico.cern.ch/contributionDisplay.py?contribId=5&confId=99443
August 3, 2010 Exotica meeting (Thesis endorsement), S. Guragain
Summary • Published the note on iCMS and circulated it to the exotica resonances group through the hypernews on 9th Julyhttps://hypernews.cern.ch/HyperNews/CMS/get/exotica-resonances/13.html• Endorsed by the EXO resonances convener
Seek endorsement of work documented in the note for my Ph.D. thesisIn-progress Writing thesis “Muon Endcap alignment for CMS experiment and its effect on the search for Z′ in the dimuon channel at LHC”
Main contents of my thesis:CRAFT paper results (Muon alignment), CMS AN-2010/064, andCollision data (dimuon) analysis, data taken through July 19 (250-300 nb-1)
Plan Finalize my dissertation and defend at Florida Tech by September 10, 2010
25
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Backup slideBackup slideOfficial MC samples:
Z′ Mass Reach analysis for MZ′SSM= 1 TeV/c2 & 1.25 TeV/c2
– Mass spectra
– Z′ Signal Significance
Data selection: Official 7 TeV MC samples:• ZprimeSSMToMuMu_M-X_7TeV-pythia6/Spring10-START3X_V26-v1/GEN-SIM-RECO
– X = 500, 750, 1000, 1250, 1500, 1750• DYToMuMu_M-Y_7TeV-pythia6/Spring10-START3X_V26-v2/GEN-SIM-RECO
– Y = 120, 200, 500, 800
These samples are reconstructed with MC-generated STARTUP alignment scenario and using CMSSW_3_5_6
Event selection:• Two opposite sign muons with pT > 20 GeV/c
• Isolation Σ track pT (ΔR < 0.3 ) < 10 GeV/c
August 3, 2010 26Exotica meeting (Thesis endorsement), S. Guragain
These signal mass points are chosen because of my earlier work and results obtained with privately generated samples.