Study of semileptonic ${\bar{B}}^{\ast }\to P\ell {\bar{\nu }}_{\ell }$ decays

Abstract

In anticipation of abundant $B^{\ast }$ data samples at high-luminosity heavy-flavor experiments in the future, the tree-dominated semileptonic ${\bar{B}}_{u,d,s}^{\ast }\to P{\ell }^{-}{\bar{\nu }}_{\ell }$ $(P=D,D_s,\pi ,K)$ decays are studied within the Standard Model. After a detailed calculation of the helicity amplitudes, the theoretical predictions for branching fraction~(decay rate), lepton spin asymmetry, forward-backward asymmetry and ratio $R_D^{\ast (L)}$ are firstly presented. It is found that the CKM-favored ${\bar{B}}^{\ast }\to D{\ell }^{-}{\bar{\nu }}_{\ell }$ decays have relatively large branching fractions of $\mathcal{O}(10^{-9})$$\sim$$\mathcal{O}(10^{-7})$, and are in the scope of running LHC and forthcoming SuperKEKB/Belle-II experiments.

18 pages, 2 figures

References in corpus (8)

• Big-Bang Nucleosynthesis
• 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
• Implications of lepton flavor universality violations in B decays
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Decay constants and radiative decays of heavy mesons in light-front quark model
• Quenched lattice calculation of the vector channel B --> D* l nu decay rate
• Form factors and decay rate of $B_c^{\ast }\to D_s{l}^{+}{l}^{-}$ decays in the QCD sum rules

Cited by in corpus (3)

• Remarks on the Standard Model predictions for $R(D)$ and $R(D^{\ast })$
• Probing new physics in semileptonic ${\Sigma }_b$ and ${\Omega }_b$ decays
• $B^{\ast }$ $\to$ $\bar{D}D$ decays with perturbative QCD approach