The role of leptonic cascades in $B_c \to B_s$ at the LHC

TL;DR

This paper explores the potential of using leptonic cascades in $B_c$ meson decays to distinguish between different form factor models at the LHC, considering contamination effects and experimental requirements.

Contribution

It introduces a method to analyze $B_c$ decay cascades to differentiate form factor models, accounting for contamination and experimental conditions.

Findings

$p_T$ distribution helps differentiate models

Contamination from vector excitations considered

High luminosity needed for precise measurements

Abstract

We study the feasibility and advantages of investigating the $c\to s$ decay channel of the $B_c$ meson through the cascade decay $B_c\to B_s\pi$, $B_s\to D_s\ell\nu$. We take into account possible contaminations coming from the vector excitations (like $B_s^*$, $D_s^*$ or $\rho$ in the intermediate stages of the cascade) too, as well as the opposite cascade $B_c\to B_s\ell\nu$, $B_s\to D_s\pi$. We show how the $p_T$ distribution of the pion and the lepton can possibly help to differentiate between various form factor models, for which we either need more integrated luminosity at the LHC, or a high-luminosity $e^+e^-$ B factory producing $B_c$ mesons too.