Model independent analysis of $B^{\ast }\to P\ell {\bar{\nu }}_{\ell }$ decay processes

Abstract

Very compelling deviations in the recently observed lepton nonuniversality observables $(R_{D^{(\ast )}},R_{K^{(\ast )}},R_{J/\psi })$ of semileptonic $B$ meson decays from their Standard Model predictions hint towards the presence of some kind of new physics beyond it. In this regard, we investigate the effect of new physics in the semileptonic ${\bar{B}}_{d(s)}^{\ast }\to P\ell {\bar{\nu }}_{\ell }$ decay processes, where $P=D,\pi (D_s,K$), in a model independent way. We consider the presence of additional vector and scalar type interactions and constrain the corresponding new couplings by fitting $\mathrm{Br}({\mathrm{B}}_{\mathrm{u}}^{+}\to {\tau }^{+}{\nu }_{\tau })$, $\mathrm{Br}(\mathrm{B}\to \pi \tau {\bar{\nu }}_{\tau })$, $\mathrm{Br}({\mathrm{B}}_{\mathrm{c}}^{+}\to {\tau }^{+}{\nu }_{\tau })$, $R_{\pi }^l$, $R_{D^{(\ast )}}$ and $R_{J/\psi }$ data. Using the constrained new parameters, we estimate the branching ratios, forward-backward asymmetry, lepton-spin asymmetry and lepton non-universality observables of ${\bar{B}}_{d,s}^{\ast }\to P\tau {\bar{\nu }}_{\tau }$ processes. We find that the branching ratios of these decay modes are sizeable and deviate significantly (for vector-type couplings) from their corresponding standard model values, which are expected to be within the reach of Run III of Large Hadron Collider experiment.

arXiv comment24 pages, 6 figures, to appear in EPJC

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• Probing effects of new physics in ${\Lambda }_b^0\to {\Lambda }_c^{+}{\mu }^{-}{\bar{\nu }}_{\mu }$ decays
• Probing new physics in semileptonic ${\Sigma }_b$ and ${\Omega }_b$ decays
• Exploring the role of new physics in $b\to u\tau \bar{\nu }$ decays
• Chirality structure of vector like new physics operators in charged current transitions
• Model Dependent Analysis of D_((s))^+ arrows η^((')) l^+ ν_l Decays in Beyond Standard Model