H g 4l in Full Simulation preliminary results
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Transcript of H g 4l in Full Simulation preliminary results
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H4l in Full Simulationpreliminary results
A. Khodinov* and K. Assamagan**
* State University of New York at Stony Brook** Brookhaven National Laboratory
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Data set (signal only)
Z(*)e+e-
Z(*)+-
hZZ(*)
mh = 130 GeV
h4e
h4
h2e2
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Framework details
• Number of Events 100.000
• Generator Pythia 6.217 (6.5.0)
• Fully simulated with ATLSIM (6.5.0)• VDC dataset simul_000033• geometry level dc1 ()
• Reconstructed with ATHENA (7.0.2)• Job Options file
RecExCommon_jobOptions.txt• Additional MC Truth Spcl_MC (F.Paige and
I.Hinchliffe)
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XKalman
2.5
pro
be o
f ele
ctro
n r
eco
nst
ruct
ion
MC Isol Cut 5 GeVET cut 10 GeVtrack match YES
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Muon ReconstructionWe suppose to compare 2 alternative methods matching
tracks in the Inner Detector with Muon Spectrometer.
1. STACO (statistical combination) MuonBox + Xkalman( planned to be included in the ATLAS software release. When?).so currently use ONLY MuonBox
Ref: Muon reconstruction with Muonbox and STACO by Hassani, S. (Saclay)
2. MuID combined (already in the release)Moore + IPatRecRef: Muon reconstruction with Moore and MuID by Biglietti M., Cataldi G. (Naples University, INFN Lecce)
STACO & Muid Comb: Combination of the muon system and the inner detector tracks
“MuonBox” & “MuidStandAlone” : Back tracking of the MuonBox and MOORE tracks to the interaction point
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Kinematical cuts as in TDR
1. e1+
e2- or
+- with pT>20 GeV (leading
pair*)
e3+
e4- or
+- with pT>7 GeV (following
pair)
2. Calculate invariant Z mass
m12 = mZ 15 GeVGeV or or (mass constraint (mass constraint 6 6
GeV)GeV)
m34 > 20 GeVGeV
Currently no cuts on Currently no cuts on R=R=((22++22) (very narrow distributions see below)) (very narrow distributions see below)
* leading pair is an on-shell Z candidate* leading pair is an on-shell Z candidate
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MuonBox2.5 ET5.GeV
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Muid CB2.5 ET5.GeV
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Single muon reconstruction efficiency as as function of pT
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Single muon reconstruction efficiency as as function of
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2.5 ET5. MC MuonBox MuID CMB MuID STD
number of single muons 130202 123036 126857 129865passed ET and cuts 0.95 0.97 0.98
number of single muons 121266 122267 122028having a MC truth prototype 0.93 0.94 0.94within R cone of 0.99and passed ET and cuts
4-muon events 7822 5921 5909 6533 0.76 0.76 0.84
4 or more muon event number 7822 6145 6251 6705 0.78 0.80 0.86
leading with m > 20 and following > 7 3952 3835 3826 0.51 0.49 0.49
leading muon pairs with masses Mz+-15 2969 2970 2875 0.38 0.38 0.37
following muon pairs with masses > 20 3320 3244 3225 0.42 0.42 0.41
final number of rec. Higgs bosons 2497 2510 2430 0.32 0.32 0.31
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Zmass
ID 99004Entries 38706Mean 91.01Sigma 1.346
ID 99502Entries 3853Mean 90.29Sigma 2.770
ID 99602Entries 3826Mean 90.09Sigma 3.790
ID 99002Entries 3952Mean 89.71Sigma 3.395
Z(*) +-
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ID 99009Entries 5845Mean 130.0
ID 99606Entries 2430Mean 128.7Sigma 2.991
ID 99006Entries 2497Mean 89.71Sigma 3.395
ID 99506Entries 2510Mean 129.6Sigma 2.096
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Summary
1. MuID combined provides better resolution than MuId stand alone, so we are awaiting for STACO to implement into the analysis.
2. Current statistics not enough to estimate resolution for h4The plan is to process up to 500K events to try to reach TDR .
3. Future study h4e and h2e2 is planned.