July Exercise Acceptance X Eff_Reco

Contents

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?)

Gen Reco error (reco) ACC X Eff error (AccXEff?) Ratio (Pythia) Ratio (Emb) Weighting Weighted Acc X Eff
Total 92409                
[Zy] < 2.4 88849 38999 +- 196.68 0.44          
pt                  
pt 0 - 4 [Zy] < 2.4 70856 28282.3 +- 166.43 0.399 +- 0.0023 0.32 0.798 0.401  
pt 4 - 8 [Zy] < 2.4 16289 9741.03 +- 91.11 0.598 +- 0.0056 0.327 0.182 1.797  
pt 8 - 12 [Zy] < 2.4 1336 2145.86 +- 38.05     0.171 0.015 11.4  
pt 12 - 20 [Zy] < 2.4 368 1211.82 +- 33.88     0.182 0.004 45.5  
rapidity                  
-2.4 < Zy < -0.8 29861 10844.6 +- 103.583 0.363 +- 0.0035 0.319 0.33 0.319  
-0.8 < Zy < 0.8 29546 17169 +- 130.15 0.581 +- 0.0044 0.368 0.33 0.368  
0.8 < Zy < 2.4 29442 11234.3 +- 105.232 0.382 +- 0.0014 0.313 0.33 0.313  
Centrality                  
0 - 3 8914 3758.31 +- 61.349 0.422 +- 0.0069        
3 - 7 9324 3928.71 +- 61.849 0.421 +- 0.0066        
7 - 11 8753 3816.16 +- 60.662 0.436 +- 0.0069        
11 - 40 61858 27654.1 +-165.716 0.447 +- 0.0027        

  • Acceptance table

pt GeV?/c Acceptance rapidity Acceptance
0-2 0.7013 -2.4 - -1.6 0.3333
2-4 0.6901 -1.6 - -0.8 0.7630
4-6 0.7019 -0.8 - 0 0.9458
6-8 0.6991 0 - 0.8 0.9374
8-10 0.7268 0.8 - 1.6 0.7482
10-12 0.7170 1.6 - 2.4 0.3402
12-14 0.6923    
14-16 0.7023    
16-18 0.6709    
18-20 0.7097    

  • 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

Gen Reco error (reco) Acc X Eff error (AccXEff?) Acceptance Ratio (Pythia) Ratio (Emb) Weighted Acc X Eff
Total 13600                
[Zy] < 2.4 13600 5978 +- 77.3175 0.4396 +- 0.0057 0.7014     0.4271
pt                  
pt 0 - 4 [Zy] < 2.4 2676 1088.41 +- 32.7351 0.40673 +- 0.012 0.6957 0.32 0.20 0.1302
pt 4 - 8 [Zy] < 2.4 2755 1233.34 +- 34.7946 0.44767 +- 0.013 0.7005 0.327 0.20 0.1464
pt 8 - 12 [Zy] < 2.4 2743 1204 +- 34.6987 0.43894 +- 0.012 0.7219 0.171 0.20 0.0751
pt 12 - 20 [Zy] < 2.4 5426 2247 +- 47.4026 0.41412 +- 0.009 0.6938 0.182 0.40 0.0754
rapidity                  
-2.4 < Zy < -0.8 4509 1660.3 +- 40.2951 0.368 +- 0.009 0.5796 0.319 0.33 0.117
-0.8 < Zy < 0.8 4536 2659.95 +- 50.9122 0.586 +- 0.010 0.9415 0.368 0.33 0.216
0.8 < Zy < 2.4 4555 1670.89 +- 40.6338 0.367 +- 0.009 0.5711 0.313 0.33 0.115
Centrality                  
0 - 3 1096 525.677 +- 22.3679 0.480 +- 0.020     0.09  
3 - 7 1611 698.55 +- 26.1429 0.434 +- 0.016     0.12  
7 - 11 1395 563 +- 23.7276 0.403 +- 0.017     0.11  
11 - 40 9274 4176.36 +-64.2389 0.450 +- 0.007     0.68  

    • Table 3 is calculated with GaussPol1?

Gen Reco error (reco) Acc X Eff error (AccXEff?) Acceptance Ratio (Pythia) Ratio (Emb) Weighted Acc X Eff
Total 13600                
[Zy] < 2.4 13600 6238.27 +- 81.66 0.459 +- 0.006 0.7014     0.453
pt                  
pt 0 - 4 [Zy] < 2.4 2676 1138.65 +- 34.6604 0.4255 +- 0.012 0.6957 0.32 0.20 0.1361
pt 4 - 8 [Zy] < 2.4 2755 1320.95 +- 37.5639 0.4795 +- 0.014 0.7005 0.327 0.20 0.1568
pt 8 - 12 [Zy] < 2.4 2743 1291.48 +- 37.34 0.4708 +- 0.014 0.7219 0.171 0.20 0.0805
pt 12 - 20 [Zy] < 2.4 5426 2378.2 +- 49.9379 0.4383 +- 0.009 0.6938 0.182 0.40 0.0798
rapidity                  
-2.4 < Zy < -0.8 4509 1703.21 +- 43.04 0.378 +- 0.009 0.5796 0.319 0.33 0.120
-0.8 < Zy < 0.8 4536 2792.21 +- 54.44 0.616 +- 0.012 0.9415 0.368 0.33 0.227
0.8 < Zy < 2.4 4555 1743.41 +- 43.55 0.383 +- 0.009 0.5711 0.313 0.33 0.120
Centrality                  
0 - 3 1096 511.15 +- 24.4304 0.466 +- 0.022     0.09  
3 - 7 1611 711.68 +- 28.33 0.441 +- 0.017     0.12  
7 - 11 1395 591.41 +- 25.62 0.424 +- 0.018     0.11  
11 - 40 9274 4396.4 +- 68.39 0.474 +- 0.007     0.68  

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

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Topic revision: r27 - 2010-09-22 - DongHoMoon
 
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