July Exercise Acceptance X Eff_Reco

Contents

• Motivation
• Ratio of Z0 for each pt and y bin using the pythia at 2.76 TeV
• Estimation for 1 pt bin
• Getting the Acc X Eff

Motivation

• To get the cross section of Z0 as a function of pt, we need to estimate the efficiency correction precisely.
• Acceptance for Z0 as a function of pt
  • the definition : (# of Z0, both mouns in the |Mu_eta| < 2.4)/(# of Z0, |Z0 y| < 2.4)

Ratio of Z0 for each pt and y bin using the pythia at 2.76 TeV?

Estimation for 1 pt bin

• Using the Vineet's macro Z0MassFit?.C and glb+glb pair, counted the number of integrated signal for the Embedded sample : 38999.1, error : 196.68
• The Acc x Eff_reco * ratio of each pt bin
  • = (# of reconstructed signal)/(# of embedded Z0 in the |Z0y| < 2.4) x 1(the ratio) = 38999.1/88609 x 100 = 44.01 %

Getting the Acc X Eff

• weighting on the pt : (ratio of pythia)/(ratio of J/psi Ramona V.)
• Error estimation : the error of A/B = A/B*( sqrt( (A_err/A)^2 + (B_err/B)^2) ) )
• Table of Acc X Eff_reco for Hydjet Embedding (Please ignore this result, please look at below AMPT regarding JulyExercise?)

• Acceptance table

• Table of Acc X Eff for AMPT Embedding
  • MC Ntuple : ~dmoon/public/JulyExersice10/Z0_2.76TeV_Emb_AMPT_Reco_Flat_total.root
  • Reco Plot root : ~dmoon/public/JulyExersice10/ZMuMu_2DPlot_Emb_ZToMuMu_AMPTFlat.root
  • Reco Plot root : ~dmoon/public/JulyExersice10/ZMuMu_Plot_Emb_ZToMuMu_AMPT_Flat.root
  • Detail info to get the numbers
    • Acc X Eff = (# of Reco)/(# of Gen([Zy]<2.4) and the Weighed Acc X Eff = Acc X Eff X (ratio of pythia)
  • Table 2 is calculated with RBWPOL1

• • Table 3 is calculated with GaussPol1?

0<pT<4	4<pT<8	8<pT<12	12<pT<20

-2.4<y<2.4	-0.8<y<0.8	0.8<y<2.4

0<centrality<3	3<centrality<7	7<centrality<11	11<centrality<40

• Acc X Eff plots vs pt, y, centraliy

Acc X Eff vs pt	Acc X Eff vs y	Acc X Eff vs Centrality

Conclusion

• the Acc X Eff is not depending on the pt shape of Z0, quite flat.

-- DongHoMoon - 08 Jul 2010