在CMS上通过H→Z0寻找Higgs粒子本底研究.ppt

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1、在CMS上通过H→Z0寻找Higgs粒子本底的研究Z.Zhang主要本底和模拟事例本底截面(pb)模拟事例对应亮度fb-1Z0.7693676123Z+njets99714240631.43tt+njets836.519901112.37ZZ+njets2.63233808.89ZW+njets4.29225765.26Zbb+njets2.012057910.2信号的预选条件cuteff.signalZZnjetsZWnjetsZZnjetsN=269.3%93.6%93.6%19.6%23.4%Pt1>10Pt2>10oppositecharge66.1%

2、80.8%14.9%17.1%20.5%Et>10

3、

4、<2.561.0%74.2%6.2%11.9%15.5%重建的Higgs不变质量的分布归一到1fb-1M5275/6099=86.4%trackisolationPt_trk<3GeVEcalisolationPt_trk<10GeVimprovepurity4665/4718=98.8%HcalisolationPt_trk<5GeVEtphotonphoton_Et>20GeVphotonselectionphotonEt>20GeV(

5、eta

6、<2.4)isolationtrack:SumPt_trk<

7、3GeVecal:SumEt<10GeVhcalSumEt<5GeVMrecoeff.4251/10000=42.5%recoeff.500/58000~1%applyittoZgammacuteff.50811/63530=79.9%conclusionSofar,IjuststudyZ+njets(n=1,2,3,4,5),soIhavestudyZ+0jet.IalsoneedtosimulatemoreZ+njetssample.Needtosimulatettbackgroundwithfastsimulation