Exclusive Rare B (s,c) Decays in Light-Front Quark Model

Abstract

We investigate the exclusive rare \({B_s\to (K,\eta^{(\prime)})(\nu_{\ell}\bar{\nu_{\ell}}, \ell^+\ell^-)}\) and \({B_c\to D_{(s)}(\nu_{\ell}\bar{\nu_{\ell}}, \ell^+\ell^-)}\) (l = e, μ, τ) decays within the standard model and the light-front quark model constrained by the variational principle for the QCD motivated effective Hamiltonian. The branching ratios and the longitudinal lepton polarization asymmetries are calculated and compared with other theoretical model predictions.