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Breakdown of MC numbers in different preshower bins

Updated on Mon, 2012-12-10 12:37. Originally created by sdhamija on 2012-12-10 12:37.

Breakdown of MC numbers in different preshower bins

I performed this study to see B/S ratio in different preshower bins scaled to data luminosity of 3.146 Pb-1
before we really start running any TMVA classifier on run6 simulation.

Preselection Cuts

(i) z vertex cut -100cm<z<100cm

(ii) Neutral fraction of jet matched to photon >0.9

(iii) cos(phi_gamma - phi_jet)<-0.8

(iv) |eta_jet|<0.8

(v) ptGamma > 7.0 GeV

(vi) ptJet > 5.0 GeV

(vii) 1.08 < eta_gamma<2.0

(viii) Number of hits in each SMD plane > 3

(ix) Away side jet neutral fraction <0.9

This table lists signal and background events after applying above mentioned cuts. Please note that these
numbers are scaled to our data luminosity of 3.146 pb-1.

Preshower condition Signal events Background events B/S
No 946 82173 87
First bin (Pre1=0, Pre2=0) 56 406 7.2
Second bin (Pre1=0, Pre2>0) 107 2100 19.6
Third bin (0<Pre1<0.004GeV) 265 11217 42.3
Fourth bin (closed)
(0.004<Pre1<0.01GeV)		 224 19597 87.5
Fourth bin (open)
(Pre1>0.004GeV)		 518 68455 132.5

Conclusion: Since we have huge B/S ratio, it's difficult to separate signal from background in these preshower bins.

 

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