Speaker
Description
Recent measurements of the ratios of branching ratios $R(D) \equiv \frac{\mathcal{B}(\bar{B} \to D \tau^- \bar{\nu}_{\tau})}{\mathcal{B}(\bar{B} \to D \ell^- \bar{\nu}_{\ell})} $ and
$R(D*) \equiv \frac{\mathcal{B}(\bar{B} \to D^* \tau^- \bar{\nu}_{\tau})}{\mathcal{B}(\bar{B} \to D^* \ell^- \bar{\nu}_{\ell})} $ by the Belle, BaBar and LHCb experiments indicate evidence for New Physics(NP) surpassing the predictions of the Standard Model (SM), with the deviation reaching a combined significance of $3.8\sigma$. In this work, we investigate the differential decay distributions of $ \bar{B} \to D^* \ell \bar{N}$, where ( N ) is a heavy right-handed neutrino and $\ell= e, \mu$. We employ a newly developed Monte Carlo event generator built upon the EvtGen framework, used specifically to simulate beyond-the-standard model processes. We validate the implementation of the model by comparing the Monte-Carlo results with analytical results for various observables in the angular distribution such as $A_{FB}$, $S_{3}$, $S_{5}$ etc.