# Study of $B_{c}^{\ast}$ ${\to}$ ${\psi}(1S,2S)P$, ${\eta}_{c}(1S,2S)P$ weak decays

## TL;DR

This paper investigates the weak decays of the $B_{c}^{ ext{*}}$ meson into charmonium states and a pion or kaon using perturbative QCD, predicting measurable branching ratios at future collider experiments.

## Contribution

First study of $B_{c}^{ ext{*}}$ weak decays into charmonium and light mesons using perturbative QCD, providing predictions for branching ratios relevant for future experiments.

## Key findings

- Branching ratio for $B_{c}^{ ext{*}} \to J/\psi \pi$ is about $10^{-8}$.
- Decay modes could be observed at future LHC experiments.
- Provides theoretical predictions for rare $B_{c}^{ ext{*}}$ decays.

## Abstract

Motivated by the potential prospects of the $B_{c}^{\ast}$ meson samples at hadron colliders, the bottom-changing $B_{c}^{\ast}$ ${\to}$ ${\psi}(1S,2S)P$, ${\eta}_{c}(1S,2S)P$ weak decays are first studied with the perturbative QCD approach, where $P$ $=$ ${\pi}$ and $K$. It is found that branching ratio of the CKM-favored $B_{c}^{\ast}$ ${\to}$ $J/{\psi}{\pi}$ decay is about ${\sim}$ ${\cal O}(10^{-8})$, which might be measurable at the future LHC experiments.