Semitauonic B Decay Anomaly

TL;DR

This paper discusses the discrepancy between experimental measurements and Standard Model predictions of semitauonic B decay ratios, exploring potential new physics explanations that are highly constrained and challenging to realize.

Contribution

It provides a brief analysis of the B decay anomaly and examines the difficulties in proposing new physics solutions within current constraints.

Findings

Experimental ratios exceed Standard Model predictions

Standard Model cannot fully explain the anomaly

New physics explanations are highly constrained

Abstract

The anomalously large experimentally measured ratios of the semitauonic decay $B\rightarrow D^{(*)} +\tau+\nu$ and the corresponding semileptonic $B\rightarrow D^{*} +\l+\bar{\nu}_l$ disagree with the predictions of the standard E.W + QCD model(S.M). We briefly comment on this disagreement and on possible new physics explanations which are rather constrained and difficult to implement.