Exclusive weak B decays involving $\tau$ lepton in the relativistic quark model

Abstract

Semileptonic and leptonic B decays are analyzed in the framework of the relativistic quark model. Special attention is payed to the decays involving $\tau$ lepton. It is found that the calculated particular decay branching fractions are consistent with available experimental data within error bars. However, the predicted and recently measured ratios $R(D^{(\ast )})$ of the $B\to D^{(\ast )}\tau {\nu }_{\tau }$ and $B\to D^{(\ast )}l{\nu }_l$ branching fractions differ by 1.75$\sigma$ for $R(D)$ and by 2.4$\sigma$ for $R(D^{\ast })$.

6 pages, 2 figures

References in corpus (6)

• On the B to D* tau nu Sensitivity to New Physics
• Exclusive semileptonic and nonleptonic decays of the Bc meson
• Relativistic treatment of the decay constants of light and heavy mesons
• Evidence for B- -> tau- nu_bar with a Semileptonic Tagging Method
• Decay constants of the heavy-light mesons from the field correlator method
• New analysis of semileptonic B decays in the relativistic quark model

Cited by in corpus (4)

• Probing new physics in ${\bar{B}}^0\to D^{(\ast )}{\tau }^{-}{\bar{\nu }}_{\tau }$ using the longitudinal, transverse, and normal polarization components of the tau lepton
• Semileptonic decays of ${\Lambda }_b$ baryons in the relativistic quark model
• Weak decays of $B_s$ mesons to $D_s$ mesons in the relativistic quark model
• A comprehensive study on the semileptonic decay of heavy flavor mesons