IPAS&USTC 1

ATGC study in ZmumuGamma channel

L. Han, L.HE, Suen.H, M.Liu, H.SongIPAS&USTC

IPAS&USTC 2

Generation of ATGC samples- BAUR NLO

• With BAUR NLO package, we generate 61 sample with H30(ϒ) from -0.03 – 0.03 with step 0.001 pt(γ) > 45GeV, |η(ϒ)|<2.37 ; pt(l) > 25GeV, |η(l)|<2.47 ; pt(jet)>20GeV, |η(jet)|<3.0 ; dR(l,ϒ) > 0.7 ; M(llϒ)>100GeV; =2TeV efract =0.5 used pdf: cteq6m

• Data: period D-H(~ 1 fb-1) using tag p605 use exactly the same event selection except: pt_gamma >45GeV M(μμϒ)>100GeV

Use H30(ϒ) for an example

Purpose: Test binning and gamma pT cut region

IPAS&USTC 3

ATGC plots

Purpose: Test binning and gamma pT cut region

60GeV

Has ATGC contribution when H30 is large

IPAS&USTC 4

Extract ATGC parameters-H30G

Purpose: Test binning and gamma pT cut region

Use Minus LogLikelihood bin-by-bin fitting

Vtot: expected eventsni: observed events in ith bin

SM BAUR Sample Vs. data(83events)

Normalize MC’s 1st bin to data

-Log(L) Value of 61 sets

60

90% CL-0.014<h30(G)<0.014

1. Binning: 45-55, 55-65,65-75,75-100,100-500

IPAS&USTC 5

Extract ATGC parameters-H30G

Purpose: Test binning and gamma pT cut region

Use Minus LogLikelihood bin-by-bin fitting

1. Binning: 60-500

60GeV

SM BAUR Sample Vs. data(83events)

Same normalization method with slide 4

Help our normalization

-Log(L) Value of 61 setsJust use >60GeV 1 bin

90% CL-0.024<h30(G)<0.024

IPAS&USTC 6

Purpose: Test binning and gamma pT cut region

1. Principle the binning should have little effect on our result, but it seems the result is affected any how

2. just use high pt region make our result worse?

IPAS&USTC 7

Back up1. Binning: 45-55,55-60,60-500

90% CL-0.024<h30(G)<0.024