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Top to stop analysis update

Top to stop analysis update. Outline. Inclusive jet trigger Jet_30, jet_3_mon,jet_50, jet_85 and jet_max QCD background estimate --- mEt spectrum fitting An alternative fitting jet_30+jet_3_mon : 0.356+0.867=1.223pb^-1 Ec=40 GeV (heavy prescaled) jet_50 :

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Top to stop analysis update

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  1. Top to stop analysis update Outline • Inclusive jet trigger Jet_30, jet_3_mon,jet_50, jet_85 and jet_max • QCD background estimate --- mEt spectrum fitting • An alternative fitting • jet_30+jet_3_mon: 0.356+0.867=1.223pb^-1 Ec=40 GeV (heavy prescaled) • jet_50: 4.684pb^-1 Ec=75 GeV (heavy prescaled) • jet_85: 57.09 pb^-1 Ec=115 GeV (small prescaled) • jet_max 93 pb^-1 Ec=135 GeV (mim prescaled) jet trigger Jun 24 2002

  2. QCD estimate: fitting mEt spectrum : Make mEt spectrum at low range and use 3 functions to fitting: normalized function: abexp(-(sqrt(bmEt)-sqrt(bmEtc))/2(1+sqrt(bmEtc) Gaussian: c1exp(-((mEt-c2)^2/2c3) exponential function: exp(c1+mEtc2) Choose the fitting with min chi square as estimated QCD background Because of the bigger difference in luminosity, there are big fluctuations Jun 24 2002

  3. Another fitting procedure • In order remove the fluctuation in QCD, we use an exponential function to fit QCD background at low Et range and extrapolate to high Et range. We use jet_3_mon+jet_30 sample to get QCD at Et>40 GeV because at this range these two triggers are fully efficient. • Or get QCD at high Et range, the low range value is derived from this exponential function. We use jet_85+jet_max sample in order to have good efficieny and good statistics at Et>110 GeV. • Compare luminosities of the two methods, the latter is better. Jun 24 2002

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