H4l in Full Simulationpreliminary results

A. Khodinov* and K. Assamagan**

* State University of New York at Stony Brook** Brookhaven National Laboratory

Data set (signal only)

Z(*)e+e-

Z(*)+-

hZZ(*)

mh = 130 GeV

h4e

h4

h2e2

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)

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

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

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

MuonBox2.5 ET5.GeV

Muid CB2.5 ET5.GeV

Single muon reconstruction efficiency as as function of pT

Single muon reconstruction efficiency as as function of

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

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(*) +-

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

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.