Lepton Flavor Violation in B Decays?
Abstract
The LHCb Collaboration's measurement of R_K = B(B+ -> K+ mu+ mu-)/B(B+ -> K+ e+e-) lies 2.6 sigma below the Standard Model prediction. Several groups suggest this deficit to result from new lepton non-universal interactions of muons. But non-universal leptonic interactions imply lepton flavor violation in B decays at rates much larger than are expected in the Standard Model. A simple model shows that these rates could lie just below current limits. An interesting consequence of our model, that B(B_s -> mu+ mu-)_{exp}/B(B_s -> mu+ mu-)_{SM} = R_K = 0.75, is compatible with recent measurements of these rates. We stress the importance of searches for lepton flavor violations, especially for B -> K mu e, K mu tau and B_s -> mu e, mu tau.
Cite
@article{arxiv.1411.0565,
title = {Lepton Flavor Violation in B Decays?},
author = {Sheldon L. Glashow and Diego Guadagnoli and Kenneth Lane},
journal= {arXiv preprint arXiv:1411.0565},
year = {2015}
}
Comments
8 pages. Discussion of P'5 added; some discussion sharpened; discussion of decays with tau's modified; references added