Abstract
Recent experimental results from the LHCb, BaBar and Belle collaborations on the semitauonic decays of B meson, \( \overline{B}\to {D}^{\left(\ast \right)}\tau \overline{\nu} \), 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 \( \overline{B}\to D\tau \overline{\nu} \) and \( \overline{B}\to {D}^{\ast}\tau \overline{\nu} \) via the exchange of scalar leptoquarks. We study the leptonic decays \( {D}_s^{+}\to {\tau}^{+}\overline{\nu} \), \( {B}^{+}\to {\tau}^{+}\overline{\nu} \), \( {D}^{+}\to {\tau}^{+}\overline{\nu} \) and \( {D}^0-{\overline{D}}^0 \) 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 \( \mathrm{\mathcal{R}}\left({D}^{\left(\ast \right)}\right) \) quite well while satisfying these constraints.
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Hati, C., Kumar, G. & Mahajan, N. \( \overline{B}\to {D}^{\left(\ast \right)}\tau \overline{\nu} \) excesses in ALRSM constrained from B, D decays and \( {D}^0-{\overline{D}}^0 \) mixing. J. High Energ. Phys. 2016, 117 (2016). https://doi.org/10.1007/JHEP01(2016)117
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DOI: https://doi.org/10.1007/JHEP01(2016)117