The anomalously large experimentally measured ratios of the semitauonic decay B→D(∗)+τ+ν and the corresponding semileptonic B→D∗+\l+νˉl 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.
@article{arxiv.1508.04463,
title = {Semitauonic B Decay Anomaly},
author = {E. C. F. S. Fortes and Shmuel Nussinov},
journal= {arXiv preprint arXiv:1508.04463},
year = {2016}
}