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 $B^0$ and $B_s^0$ mesons using $B^0\to J\mathrm{/}\psi K^{+}{\pi }^{-}$ and $B_s^0\to D_s^{-}{\pi }^{+}$ 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.