$\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ excesses in ALRSM constrained from $B$, $D$ decays and $D^0-{\bar{D}}^0$ mixing

Abstract

Recent experimental results from the LHCb, BaBar and Belle collaborations on the semitauonic decays of $B$ meson, $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$, showing a significant deviation from the Standard Model (SM), hint towards a new physics scenario beyond the SM. In this work, we show that these enhanced decay rates can be explained within the framework of $E_6$ motivated Alternative Left-Right Symmetric Model (ALRSM), which has been successful in explaining the recent CMS excesses and has the feature of accommodating high scale leptogenesis. The R-parity conserving couplings in ALRSM can contribute universally to both $\bar{B}\to D\tau \bar{\nu }$ and $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ via the exchange of scalar leptoquarks. We study the leptonic decays $D_s^{+}\to {\tau }^{+}\bar{\nu }$, $B^{+}\to {\tau }^{+}\bar{\nu }$, $D^{+}\to {\tau }^{+}\bar{\nu }$ and $D^0$-${\bar{D}}^0$ mixing to constrain the couplings involved in explaining the enhanced $B$ decay rates and we find that ALRSM can explain the current experimental data on $\mathcal{R}(D^{(\ast )})$ quite well while satisfying these constraints.

10 pages, 10 figures, minor refinements, all results unchanged, new references added

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• Implications of lepton flavor universality violations in B decays
• Search for heavy neutrinos and W bosons with right-handed couplings in proton-proton collisions at sqrt(s) = 8 TeV
• Heavy neutrinos and the $pp\to lljj$ CMS data
• Accumulating evidence for nonstandard leptonic decays of D_s mesons
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Cited by in corpus (37)

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• Phenomenology of an $SU(2)\times SU(2)\times U(1)$ model with lepton-flavour non-universality
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• New Physics in the Visible Final States of $B\to D^{(\ast )}\tau \nu$
• LHCb anomaly and $B$ physics in flavored Z${}^{\prime }$ models with flavored Higgs doublets
• D* polarization as a probe to discriminate new physics in B --> D* tau nubar
• Charged-Higgs on $R_{D^{(\ast )}}$, $\tau$ polarization, and FBA
• Discrepancies in simultaneous explanation of Flavor Anomalies and IceCube PeV Events using Leptoquarks
• LHC constraints and prospects for $S_1$ scalar leptoquark explaining the $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ anomaly
• QCD Improved Matching for Semi-Leptonic B Decays with Leptoquarks
• Lepton Number Violation and `Diracness' of massive neutrinos composed of Majorana states
• Revisiting R-parity violating interactions as an explanation of the B-physics anomalies
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• Lepton flavour violating B meson decays via scalar leptoquark
• Anomalies in (semi)-leptonic $B$ decays $B^{\pm }\to {\tau }^{\pm }\nu$, $B^{\pm }\to D{\tau }^{\pm }\nu$ and $B^{\pm }\to D^{\ast }{\tau }^{\pm }\nu$, and possible resolution with sterile neutrino
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• Probing a simplified, $W^{\prime }$ model of $R(D^{(\ast )})$ anomalies using $b$-tags, $\tau$ leptons and missing energy
• Correlating Tauonic B Decays to the Neutron EDM via a Scalar Leptoquark
• Reconciling $B$-decay anomalies with neutrino masses, dark matter and constraints from flavour violation
• A nonunitary interpretation for a single vector leptoquark combined explanation to the $B$-decay anomalies
• R-parity violating solutions to the $R_{D^{(\ast )}}$ anomaly and their GUT-scale unifications
• ${\rm Y}$ and $\psi$ leptonic decays as probes of solutions to the $R_D^{(\ast )}$ puzzle
• The Forward-Backward Asymmetry in $B\to D^{\ast }\ell \nu$: One more hint for Scalar Leptoquarks?
• New Physics effects in charm meson decays involving $c\to u{l}^{+}{l}^{-}(l_i^{\mp }{l}_j^{\pm })$ transitions
• Dispersive analysis of neutral meson mixing
• Remarks on the Standard Model predictions for $R(D)$ and $R(D^{\ast })$
• Constraints on Scalar Leptoquark from Kaon Sector
• Electroweak couplings and LHC constraints on alternative $Z^{\prime }$ models in $E_6$
• The fate of $V_1$ vector leptoquarks: the impact of future flavour data
• Revisiting the Scalar Leptoquark ($S_1$) Model with the Updated Leptonic Constraints
• Role of electromagnetic corrections in the $\pi \pi$ distributions of ${\psi }^{\prime }\to J/\psi \pi \pi$