Flavour Tagging Purity Analysis Across Jet Energies with Fixed Efficiency

DESCRIPTION

This study investigates the flavour tagging purity as a function of energy and polar angle for jets with various energies (100 GeV, 175 GeV, 250 GeV, 25 GeV, 37.5 GeV, and 50 GeV) at a fixed efficiency of 70%. We explore the angular dependence of the purity of b and c quark backgrounds, and its qualitative consistency with changes around the Z-pole. Notably, at high energies, the purity achieves a plateau value correlating with a fixed efficiency, and we compare vertex charges using MPt tagging, revealing good agreement with leakage rates from MPt-tagged samples.

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Apr 28, 2026

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Flavour Tagging Purity Analysis Across Jet Energies with Fixed Efficiency

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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
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
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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