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.
Categories: hep-ph