Exclusive semileptonic $B_c$-meson decays to radially excited charmonium and charm meson states

Abstract

In the wake of recent measurements of ratios of semileptonic branching fractions: ${\mathcal{R}}_{J/\psi },{\mathcal{R}}_D$ and ${\mathcal{R}}_{D^{\ast }}$ reported by the LHCb, BELLE and HFLAV Collaborations, we calculate invariant form factors for the exclusive semileptonic $B_c$-meson decays to radially excited charmonium and charm meson states in the full kinematical region within the framework of relativistic independent quark (RIQ)model. We evaluate the lepton mass effect in the decay processes induced by $b\to c,u$ transition at the quark level. Our predictions on branching fractions for $B_c\to {\eta }_c/\psi (nS)$ are found $\sim 10^{-2}-10^{-4}$ and that for $B_c\to D^{\ast }(nS)$ are $\sim 10^{-4}$ in their $e^{-}$ decay modes, which lie within the detection accuracy of current experiment. Our predictions on branching fractions, forward backward asymmetry and asymmetry parameter are found in reasonable agreement with other model predictions; which can hopefully be tested in future experiments at LHC and Tevatron. Our predicted observable $\mathcal{R}$ in this sector are found comparable to other standard model (SM) predictions that violate the lepton flavor universality hinting at new physics beyond SM.

40 pages and 23 figure files. arXiv admin note: substantial text overlap with arXiv:2106.09463

References in corpus (15)

• On the B to D* tau nu Sensitivity to New Physics
• Measurement of the branching ratio of ${\bar{B}}^0\to D^{\ast +}{\tau }^{-}{\bar{\nu }}_{\tau }$ relative to ${\bar{B}}^0\to D^{\ast +}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with a semileptonic tagging method
• Exclusive semileptonic and nonleptonic decays of the Bc meson
• Study of exclusive semileptonic and nonleptonic decays of $B_c^{-}$ in a nonrelativistic quark model
• Semileptonic $B_c$ decays and Charmonium distribution amplitude
• Estimation of Semileptonic Decays of $B_c$ Meson to S-wave Charmonia with NRQCD
• S-wave ground state charmonium decays of $B_c$ mesons in the perturbative QCD approach
• Study of Bc --> J/psi pi, etac pi decays with perturbative QCD approach
• Bc Meson Formfactors and Bc-->PV Decays Involving Flavor Dependence of Transverse Quark Momentum
• Weak productions of new charmonium in semi-leptonic decays of B_c
• QCD corrections to the $B_c$ to charmonia semi-leptonic decays
• Semileptonic B_{c} to P-Wave Charmonia Transitions within QCD Sum Rules
• Exclusive nonleptonic Bc-meson decays to S-wave charmonium states
• Lepton mass effects in exclusive semileptonic $B_c$-meson decays
• Radially Excited States of ${\eta }_c$

Cited by in corpus (3)

• Analyzing the semileptonic and nonleptonic $B_c\to J/\psi ,{\eta }_c$ decays
• Assessing Lepton Flavor Universality Violations in Semileptonic Decays
• Study of angular observables in exclusive semileptonic $B_c$ decays