Model independent investigation of rare semileptonic b \to u l \barν_l decay processes

Abstract

Motivated by the recent observation of lepton universality violation in the flavour changing charged current transitions $b\to cl{\bar{\nu }}_l$, we intend to scrutinize the lepton non-universality effects in rare semileptonic $B$ meson decays involving the quark level transitions $b\to ul{\bar{\nu }}_l$. In this regard, we envisage the model-independent approach and consider the generalized effective Lagrangian in the presence of new physics and constrain the new parameters by using the experimental branching fractions of $B_u^{+}\to l^{+}{\nu }_l$ and $B^{-}\to {\pi }^0{\mu }^{-}{\bar{\nu }}_{\mu }$ processes, where $l=e,\mu ,\tau$. We then estimate the branching ratios and forward-backward asymmetries of $B_{(s)}\to P(V)l{\bar{\nu }}_l$ processes, where $P(=K,\pi ,{\eta }^{(\prime )})$ denotes the pseudoscalar meson and $V(=K^{\ast },\rho )$ is the vector meson. We also find out various lepton non-universality parameters in these processes in the presence of new physics.

arXiv comment32 pages, 21 figures, to appear in Phys. Rev. D

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Cited by in corpus (3)

• Probing New Physics with $\bar{B}\to \rho (770){\ell }^{-}{\bar{\nu }}_{\ell }$ and $\bar{B}\to a_1(1260){\ell }^{-}{\bar{\nu }}_{\ell }$
• Impact of vector new physics couplings on $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decays
• Exploring the role of new physics in $b\to u\tau \bar{\nu }$ decays