New physics searches in $B \rightarrow D^{(*)}\tau \nu$ decays

TL;DR

This paper reviews current measurements of semi-tauonic B meson decays, discusses experimental challenges and background contributions, and explores potential New Physics models that could explain observed discrepancies from the Standard Model.

Contribution

It provides a comprehensive overview of experimental methods, background issues, and discusses a specific New Physics model relevant to semi-tauonic B decays.

Findings

Highlighting the importance of background contributions from $D^{**}$

Discussion of the 3.2$\sigma$ discrepancy in BaBar measurements

Analysis of a New Physics model sensitive to experimental tests

Abstract

I review the current status of measurements involving semi-tauonic $B$ meson decay at the $B$-factories. I briefly discuss the experimental methods and highlight the importance of background contributions especially from poorly understood $D^{**}$ in this study. Perhaps this can also shed some light on the discrepancy in the BaBar measurement of ratio of semi-tauonic and semi-leptonic ($e$/$\mu$) modes of $B$ decay from the Standard Model (SM) at 3.2$\sigma$. I will also discuss one of the New Physics (NP) models that could be experimentally sensitive in being distinguished from the Standard Model (SM).