$R(D^{(\ast )})$ and $\mathcal{B}r(B\to \tau {\nu }_{\tau })$ in a Flipped/Lepton-Specific 2HDM with anomalously enhanced charged Higgs coupling to $\tau$/b

Abstract

Babar, Belle and recently LHCb has reported an excess in the measurements of $R(D^{\ast })$, $R(D)$ and $\mathcal{B}r(B\to \tau {\nu }_{\tau })$ than expected from SM, a possible signature of lepton flavor universality violating NP. In this work we analyze the phenomenological implications for these decay modes in a Flipped/Lepton-Specific 2HDM with anomalously enhanced Yukawa coupling of $H^{\pm }$ to $\tau$/b. When experimental and theoretical errors are added in quadrature, we conclude that this phenomenological extension of SM can give results in agreement within 1$\sigma$ deviation for the combination of $R(D^{(\ast )})$ and $\mathcal{B}r(B\to \tau {\nu }_{\tau })$ compare to about 4$\sigma$ deviation from SM from the latest combined[Babar,Belle,LHCb] experimental data for these observables.

arXiv comment10 pages

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• $b\to s{\ell }^{+}{\ell }^{-}$ Transitions in Two-Higgs-Doublet Models
• Charged current $b\to c\tau {\bar{\nu }}_{\tau }$ anomalies in a general $W^{\prime }$ boson scenario
• $B\to D^{(\ast )}\tau {\nu }_{\tau }$ in the 2HDM with an anomalous $\tau$ coupling
• Analysing the charged scalar boson contribution to the charged-current $B$ meson anomalies
• Detailed Study of the Decay Lambda_b --> Lambda_c tau {\bar ν}_τ
• Probing New Physics in light of recent developments in $b\to c\ell \nu$ transitions
• Polarization in (quasi-)two-body decays and new physics