B-meson charged current anomalies: The post-Moriond 2019 status

Abstract

In this paper, we discuss the impact of the recent Belle result on the various theoretical explanations of the R-D and R-D* anomalies. The pure tensor explanation, which was strongly disfavored by the measurements of F-L(D)* and high-p(T) pp -> tau nu searches before Moriond, is now completely allowed because of the reduction of the experimental world average. Moreover, the pure right-chiral vector solution (involving right-chiral neutrinos) has now moved into the 2 sigma allowed range of the LHC pp -> tau nu searches. We also critically reexamine the bound on B(B-c(-) -> tau(-)(nu) over bar (tau)) from large electron-positron collider data and show that the bound is considerably weaker than the number 10% often used in the recent literature.