Hint of lepton flavou non-universality in B meson decays

被引：120
作者：
Ghosh, Diptimoy [1 ]
Nardecchia, Marco [2 ]
Renner, S. A. [2 ]
机构：
[1] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy
[2] Univ Cambridge, DAMTP, Cambridge CB3 0WA, England
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2014年 / 12期
基金：
欧洲研究理事会;
关键词：
Rare Decays; Beyond Standard Model; B-Physics; CP VIOLATION;
D O I：
10.1007/JHEP12(2014)131
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
The LHCb collaboration has recently presented their result on R-K = B(B+ -> K+ mu(+) mu(-)) /B(B+ -> K(+)e(+)e(-)) for the dilepton invariant mass bin m 2 m(ll)(2) = 1 - 6 GeV2 (l = mu,e). The measurement shows an intriguing 2.6 sigma deviation from the Standard Model (SM) prediction. In view of this, we study model independent New Physics (NP) explanations of R K consistent with other measurements involving b -> sl(+) l(-) transition, relaxing the assumption of lepton universality. We perform a Bayesian statistical fit to the NP Wilson Coefficients and compare the Bayes Factors of the different hypotheses in order to quantify their goodness-of-fit. We show that the data slightly favours NP in the muon sector over NP in the electron sector.
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页数：18
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