hep-ph

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# Title: 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.
 Comments: 8 pages. Discussion of P'5 added; some discussion sharpened; discussion of decays with tau's modified; references added Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex) Journal reference: Phys. Rev. Lett. 114, 091801 (2015) DOI: 10.1103/PhysRevLett.114.091801 Report number: CERN-PH-TH-2014-229, LAPTH-227/14 Cite as: arXiv:1411.0565 [hep-ph] (or arXiv:1411.0565v2 [hep-ph] for this version)

## Submission history

From: Kenneth Lane [view email]
[v1] Mon, 3 Nov 2014 17:06:37 GMT (16kb,D)
[v2] Fri, 14 Nov 2014 17:35:12 GMT (17kb,D)
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