VBF H->ττ->lept had

Electron ChannelJaspreet Sidhu

ATLAS Toronto meeting

24-08-05

Goals

Produce updated Full Simulation of H->ττ, τ-> e , τ-> h , with good TRT(Transition Radiation Track) simulation

Improve Electron IdentificationImprove Reconstruction

Efficiency

Data Set

Generation + Simulation– Release 10.0.1– Rome layout, with TRT

simulation Digitization +

Reconstruction– Release 10.0.1– Default reconstruction

parameters• Electrons, tau’s…, jets– R=0.4 Cone algorithm for

jets– AOD objects

Pythia Production H->ττ , VBF mode

10000 Events

MH = 115GeV

τ-> e , τ-> h

(σ x BR) = 390 fb

Full simulation (Tau ID, Elec ID)

Tau is essentially a narrow jet in the dectector

Tau Id Cuts

abs(charge)==1

NumTrack ==1,3

likelihood >4

Elec ID

hasTrack()

pT > 20GeV

egamma object

isEM ==0 (using all the flags)

Elec Id (compare TRT 10.0.1) Truth Container ( 3930 electrons , 3466 events) Begin with 33452 electron candidates Basic Cut: Pt <20GeV , HasTrack(), Egamma Object

( 5119 electrons)Cut # elec (%)

isEM(all flags)

3058 77.8%

Isolation(EtCone<10GeV)

2529 64.3%

isEM(no TRT)

2814 71.6%

Isolation 2400 61.1%

epiNN 3835 96.1%

Isolation 2971 75.6%

Number of Electrons

All Electrons

BasicCut

isEMAll flags

isEMNo TRT

epiNN Cut

Summary

Production test went well (except for Condor crashes)

Improving Elect ID with TRT and Isolation EoverP studies going on Tau identification still to be done Trigger to be included in the next reconstruction

round