Inclusive $B$-meson flavour-tagging algorithm at LHCb

Abstract

A new algorithm is developed to identify the flavour of neutral $B$ mesons at production in $pp$ collisions by utilising all tracks from the hadronisation process. The algorithm is calibrated separately for $B^0$ and $B_s^0$ mesons using $B^0\to J/\ddot{I}ˆK^{+}\ddot{I}{€}^{-}$ and $B_s^0\to D_s^{-}\ddot{I}{€}^{+}$ decays from $pp$ collision data collected by the LHCb experiment at a centre-of-mass energy of 13\,TeV. This new algorithm improves the tagging power by 35\% for $B^0$ mesons and 20\% for $B_s^0$ mesons when compared to the combined performance of the existing LHCb flavour-tagging algorithms.

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/3815/ (LHCb public pages)