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E Jet = 25 GeV

E Jet = 25 GeV. E Jet = 37.5 GeV. E Jet = 50 GeV. Flavour tag as function of energy and polar angle. angular dependence of tagging purity plotted for fixed efficiency of 70% change in b and c(b-bkgd) purity around Z-pole qualitatively consistent with change

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E Jet = 25 GeV

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  1. EJet = 25 GeV EJet = 37.5 GeV EJet = 50 GeV Flavour tag as function of energy and polar angle • angular dependence of tagging purity • plotted for fixed efficiency of 70% • change in b and c(b-bkgd) purity around • Z-pole qualitatively consistent with change • of fractions of different flavours in sample

  2. EJet = 250 GeV EJet = 175 GeV EJet = 100 GeV • for high energy, b- and c(b-bkgd) purity • reach same plateau value; • efficiency of 70% is already in this plateau • range • will be interesting to look at how purity • depends on cos q for 80 and 90% efficiency

  3. Vertex charge: comparison with result from MPt tag • NN tag obtained at fixed b-tag efficiency of 70%, for MPt approach varies between 65% & 72% • good agreement of leakage rates with those obtained from MPt-tag and pure b bbar sample

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