B ¯ → D ∗ τ ν ¯ $$ \overline{B}\to {D}^{\left(\ast \right)}\tau \overline{\nu} $$ excesses in ALRSM constrained from B, D decays and D 0 − D ¯ 0 $$ {D}^0-{\overline{D}}^0 $$ mixing

• DOI: 10.1007/jhep01(2016)117
• Publication Date: 2016-01-22T10:22:18Z
• Authors: Chandan Hati; Girish Kumar; Namit Mahajan
• Keywords: Bar (unit); Leptogenesis; CP violation

Recent experimental results from the LHCb, BaBar and Belle collaborations on semitauonic decays of $B$ meson, $\bar{B}\rightarrow D^{(\ast)}\tau \bar{\nu}$, showing a significant deviation Standard Model (SM), hint towards new physics scenario beyond SM. In this work, we show that these enhanced decay rates can be explained within framework $E_{6}$ motivated Alternative Left-Right Symmetric (ALRSM), which has been successful in explaining recent CMS excesses feature accommodating high scale leptogenesis. The R-parity conserving couplings ALRSM contribute universally to both D \tau \bar{\nu}$ via exchange scalar leptoquarks. We study leptonic $D_{s}^{+} \rightarrow \tau^{+} $B^{+}\rightarrow $D^{+}\rightarrow $D^{0}$-$\bar{D}^{0}$ mixing constrain involved find explain current data $\mathcal{R}(D^{(\ast)})$ quite well while satisfying constraints.