A new algorithm for identifying the flavour of $B_s^0$ mesons at LHCb

Understand

A new algorithm for the determination of the initial flavour of $B_s^0$ mesons is presented.

• The algorithm is based on two neural networks and exploits the $b$ hadron production mechanism at a hadron collider.
• The first network is trained to select charged kaons produced in association with the $B_s^0$ meson.
• The second network combines the kaon charges to assign the $B_s^0$ flavour and estimates the probability of a wrong assignment.