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

## TL;DR

This paper introduces a new inclusive flavour-tagging algorithm for neutral B mesons at LHCb, utilizing all tracks from hadronisation, calibrated with specific decay modes, and showing significant improvements in tagging power over previous methods.

## Contribution

A novel inclusive flavour-tagging algorithm for B mesons that enhances tagging efficiency by leveraging all hadronisation tracks and is calibrated with specific decay channels.

## Key findings

- 35% improvement in tagging power for B^0 mesons
- 20% improvement for B_s^0 mesons
- Algorithm calibrated with specific decay modes

## 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 $B^{0}_{s}$ mesons using $B^{0}\to J/\psi K^{+}\pi^-$ and $B^{0}_{s}\to D_{s}^{-}\pi^+$ 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 $B^{0}_{s}$ mesons when compared to the combined performance of the existing LHCb flavour-tagging algorithms.