Inclusive B-meson flavour-tagging algorithm at LHCb

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 B⁰ and B⁰ₛ mesons using B⁰→ J/ψK⁺π⁻ and B⁰ₛ→ Dₛ⁻π⁺ 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 B⁰ mesons and 20% for B⁰ₛ mesons when compared to the combined performance of the existing LHCb flavour-tagging algorithms.