# Semileptonic decays of $ B_c$ mesons into charmonium states

## TL;DR

This paper calculates the form factors for semileptonic $B_c$ meson decays into various charmonium states using a covariant quark model, providing predictions for branching ratio ratios to be tested at LHC.

## Contribution

It presents a comprehensive calculation of $B_c$ decay form factors across the full kinematic range within a covariant quark model, including ratios of branching fractions.

## Key findings

- Calculated form factors for multiple $B_c$ decay channels.
- Predicted ratios of branching fractions ($R_{\eta_c}$, $R_{J/\psi}$, etc.).
- Results are consistent with other theoretical models.

## Abstract

In this work we study the semileptonic decays of $B_c$ meson. We evaluated $B_{c}\rightarrow D(D^{\ast})$, $B_{c}\rightarrow D_s(D_s^{\ast})$ and $B_{c}\rightarrow \eta_{c}(J/\psi)$ transitions form factors in the full kinematical region within the covariant quark model. The calculated form factors are used to evaluate the semileptonic decays of $B_c$ meson and it was defined ratios ($R_{\eta_{c}}$, $R_{J/\psi}$, $R_{ D}$ ,$R_{ D^{\ast}}$) of the branching ratios, which will be hopefully tested on LHC experiments.We compare the obtained results with the results from other theoretical approaches.