Imprinting New Physics by using Angular profiles of the FCNC process $B_{c}\to D_{s}^{*}\left(\to \;D_{s}\pi\right)\ell^{+}\ell^{-}$

TL;DR

This paper investigates the angular profiles of the rare FCNC decay $B_c o D_s^* o D_s o ext{mesons} \, ext{and} \, ar{ ext{leptons}}$ to identify potential signs of new physics beyond the Standard Model.

Contribution

It introduces a detailed analysis of angular observables in the $B_c$ decay using covariant light-front quark model form factors, exploring their sensitivity to new physics scenarios.

Findings

Branching fractions and angular observables are calculated within the SM and NP models.

Some angular observables show potential to distinguish NP effects from SM predictions.

The study highlights specific asymmetries as promising probes for new physics.

Abstract

The decays governed by the flavor-changing-neutral-current transitions (FCNC), such as $b\to s\ell^{+}\ell^{-}$, provide an important tool to test the physics in and beyond the Standard Model (SM). This work focuses on investigating the FCNC process $B_{c}\to D_{s}^{*} \left(\to D_{s}\pi\right)\ell^{+}\ell^{-}(\ell=e,\mu,\tau)$. Being an exclusive process, the initial and final state meson matrix elements involve the form factors, which are non-perturbative quantities and need to be calculated using specific models. By using the form factors calculated in the covariant light-front quark model, we analyze the branching fractions and angular observables such as the forward-backward asymmetry $A_{FB}$, polarization fractions (Longitudinal and transverse) $F_{L(T)}$, CP asymmetry coefficients $A_{i}$ and CP-averaged angular coefficients $S_{i}$, both in the SM and some new physics (NP) scenarios. Some of these physical observables are a potential source of finding the physics beyond the SM and help us distinguish various NP scenarios.