muon reco . efficiency status: from j/psi to z t&p
DESCRIPTION
Muon reco . efficiency status: from J/psi to Z T&P. Giovanni Petrucciani (UCSD). Outline. Introduction Results for the “Run2010A” period (before the last technical stop; about 3/pb) Turn on curves from J/Psi Efficiency on the plateau from Z - PowerPoint PPT PresentationTRANSCRIPT
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Muon reco. efficiency status: from J/psi to Z T&P
Giovanni Petrucciani (UCSD)
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Outline
• Introduction• Results for the “Run2010A” period
(before the last technical stop; about 3/pb)– Turn on curves from J/Psi– Efficiency on the plateau from Z
• New results for the “Run2010B” period(last week of running; integrated luminosity about 2/pb for Z and 1/pb for J/Psi)
MuBW 28.09.2010 2G. Petrucciani (UCSD)
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Introduction
• The Tag & Probe method allows to measure the muon reconstruction efficiencies using di-muons from resonances like J/Psi and Z(see Zoltan’s talk Monday at this workshop)
• In this talk, I will discuss about the offline muon reconstruction and id. efficiencies.
MuBW 28.09.2010 3G. Petrucciani (UCSD)
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Reconstruction efficiencies
• The efficiency to reconstruct a muon using also the inner tracker can be parametrized aseff(mu) = eff(inner track) * eff(track -> mu)
• The efficiency to reconstruct the inner track is approx. 100% for all muons from J/Psi and Z, so we will measure only eff(track -> mu)
• The measurement of the standalone reco. efficiency is more complex, as one has to handle the matching. Studies are ongoing (D. Trocino)
MuBW 28.09.2010 4G. Petrucciani (UCSD)
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Triggers and selections
• In order to collect (muon + track) pairs in an unbiased way:– For Z, we just require that the muon fires the Mu9
trigger (still unprescaled in the 2E31 menu)– For J/Psi, the situation is more difficult:
At trigger level, use Mu5_Track0_Jpsi triggerAt offline level, require the track to be a calo muon in order to reduce the background from muon + hadron pairs
MuBW 28.09.2010 5G. Petrucciani (UCSD)
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Results from Run2010A era
Global muon reconstruction efficienciesBarrelBarrel EndcapsEndcaps
MuBW 28.09.2010 6G. Petrucciani (UCSD)
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Results from Run2010A era
Arbitrated tracker muon id. efficiencies
BarrelBarrel EndcapsEndcaps
MuBW 28.09.2010 7G. Petrucciani (UCSD)
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Results from Run2010A era
Tracker muon LastStationAngTight efficienciesBarrelBarrel EndcapsEndcaps
MuBW 28.09.2010 8G. Petrucciani (UCSD)
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Results from Run2010A era
Tight (VBTF) muon id. efficienciesBarrelBarrel EndcapsEndcaps
MuBW 28.09.2010 9G. Petrucciani (UCSD)
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Global muon reconstruction efficiencies
Average EffiencyData: 98.8 ± 1.1
%MC: 98.79 ± 0.04
%
Average EffiencyData: 98.8 ± 1.1
%MC: 98.79 ± 0.04
%
Results from Run2010A era
PT > 20 GeVPT > 20 GeV
MuBW 28.09.2010 10G. Petrucciani (UCSD)
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Results from Run2010A era
Arbitrated tracker muon id. efficiencies
PT > 20 GeVPT > 20 GeV
Average EffiencyData: 100.0 − 0.8
%MC: 99.52 ± 0.02
%
Average EffiencyData: 100.0 − 0.8
%MC: 99.52 ± 0.02
%
MuBW 28.09.2010 11G. Petrucciani (UCSD)
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Results from Run2010A era
Tight (VBTF) muon id. efficiencies
PT > 20 GeVPT > 20 GeV
Average EffiencyData: 96.3 ± 1.2
%MC: 95.99 ± 0.07
%
Average EffiencyData: 96.3 ± 1.2
%MC: 95.99 ± 0.07
%
MuBW 28.09.2010 12G. Petrucciani (UCSD)
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New results from Run2010B era
Disclaimers:• These runs have not yet been certified yet.
What I’ve used is:– DCS status flags of all subdetectors– Manual certification flag for Muon only
(DPG flags were sometimes inconsistent beween between online and offline flags)
• I didn’t process 3.8.X MC yet, so I’ll show only plots of Run2010A data vs Run2010b data
MuBW 28.09.2010 13G. Petrucciani (UCSD)
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Run2010B vs Run2010A
Global muon reconstruction efficienciesBarrelBarrel EndcapsEndcaps
MuBW 28.09.2010 14G. Petrucciani (UCSD)
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Run2010B vs Run2010A
Arbitrated tracker muon id. efficiencies
BarrelBarrel EndcapsEndcaps
MuBW 28.09.2010 15G. Petrucciani (UCSD)
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Run2010B vs Run2010A
Tracker muon LastStationAngTight efficienciesBarrelBarrel EndcapsEndcaps
MuBW 28.09.2010 16G. Petrucciani (UCSD)
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Run2010B vs Run2010A
Tight (VBTF) muon id. efficienciesBarrelBarrel EndcapsEndcaps
MuBW 28.09.2010 17G. Petrucciani (UCSD)
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Global muon reconstruction efficiencies
Average EffiencyNew: 98.7 ± 1.1
%Old: 98.8 ± 1.1
%
Average EffiencyNew: 98.7 ± 1.1
%Old: 98.8 ± 1.1
%
Run2010B vs Run2010A
PT > 20 GeVPT > 20 GeV
MuBW 28.09.2010 18G. Petrucciani (UCSD)
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Run2010B vs Run2010A
Arbitrated tracker muon id. efficiencies
PT > 20 GeVPT > 20 GeV
Average EffiencyNew: 99.8 ± 0.2
%Old: 100 − 0.1
%
Average EffiencyNew: 99.8 ± 0.2
%Old: 100 − 0.1
%
MuBW 28.09.2010 19G. Petrucciani (UCSD)
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Run2010B vs Run2010A
Tight (VBTF) muon id. efficiencies
PT > 20 GeVPT > 20 GeV
Average EffiencyNew: 96.3 ± 1.2
%Old: 96.3 ± 1.2
%
Average EffiencyNew: 96.3 ± 1.2
%Old: 96.3 ± 1.2
%
MuBW 28.09.2010 20G. Petrucciani (UCSD)
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Run2010B vs Run2010A
• In general, good agreement between Run2010A (3.6.X) and Run2010B (3.8.X).Two visible differences:– Large increase in tracker muon efficiency in the
endcaps for pT = 1-2 GeV (?)
– Improvement in the turn on curve for tight muon efficiency (plateau value on Z unaffected)
MuBW 28.09.2010 21G. Petrucciani (UCSD)
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Conclusions
• Muon reconstruction efficiencies have been measured on data using J/Psi and Z.
• At the current luminosities, a few days of data-taking are enough to get good quality measurements of the turn on and plateau.
• In general, there is good agreement between new data (3.8.X), old data (3.6X) and MC.Some differences for soft tracker muons, but in the good direction (3.8.X > 3.6.X > MC)
MuBW 28.09.2010 G. Petrucciani (UCSD) 22