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ATGC study in ZmumuGamma channel

ATGC study in ZmumuGamma channel. L. Han, L.HE, Suen.H , M.Liu , H.Song IPAS &USTC. Generation of ATGC samples- BAUR NLO. Use H30( ϒ ) for an example. 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 ;

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ATGC study in ZmumuGamma channel

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  1. ATGC study in ZmumuGamma channel L. Han, L.HE, Suen.H, M.Liu, H.Song IPAS&USTC IPAS&USTC

  2. Generation of ATGC samples- BAUR NLO Use H30(ϒ) for an example • 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 IPAS&USTC

  3. Binning Use H30(ϒ) for an example We binned pT_ϒ to 2 bins- 45GeV to 60 GeV and 60GeV above. We use 45GeV<pT_ϒ<60GeV as normalization We use pT_ϒ>60GeV to fit with data IPAS&USTC

  4. Normalization – 45GeV<pT_ϒ<60GeV Use H30(ϒ) for an example σ(ATGC)/σ(SM) in 45GeV<pT_ϒ<60GeV σ changes little with different H30ϒ parameter in 45 GeV- 60 GeV. We can negalectATGC in this region. H30(ϒ) 1. SM dominate in 45GeV to 60GeV 2. εϒin (45GeV,60GeV) and (>60GeV) region almost same We normalize MC’s 45GeV – 60GeV bin to data. Likelihood Fitting method We calculate the likelihood of data and MC in pT_ϒ>60GeV with different H30(ϒ). when a polynomial is fitted to the array of negative logarithmic likelihood values Vtot: expected events ni: observed events in ith bin IPAS&USTC

  5. H30_ϒ σ(ATGC)/σ(SM) in 45GeV<pT_ϒ<60GeV Result of H30_ϒ: -0.029<h30(ϒ)<0.030 With 95%CL H30(ϒ) IPAS&USTC

  6. H30_Z σ(ATGC)/σ(SM) in 45GeV<pT_ϒ<60GeV Result of H30_Z: -0.023<h30(Z)<0.024 With 95%CL H30(Z) IPAS&USTC

  7. H40_ϒ σ(ATGC)/σ(SM) in 45GeV<pT_ϒ<60GeV Result of H40_ϒ: -0.00061<h40(ϒ)<0.00064 With 95%CL H40(ϒ) *10-3 IPAS&USTC

  8. H40_Z σ(ATGC)/σ(SM) in 45GeV<pT_ϒ<60GeV Result of H40_Z: -0.00050<h40(Z)<0.00051 With 95%CL H40(Z) IPAS&USTC

  9. Comparison of D0 and ATLAS result IPAS&USTC

  10. Summary Our frame-work for ATGC study is ready; We have got a preliminary result which is much better than D0 1.02/fb result. IPAS&USTC

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