Abstract: The LHCb collaboration has recently presented their result on RK = ℬ(B<sup>+</sup> → K<sup>+</sup>μ<sup>+</sup>μ<sup>−</sup>)/ ℬ(B<sup>+</sup> → K<sup>+</sup>e<sup>+</sup>e<sup>−</sup>) for the dilepton invariant mass bin mℓℓ<sup>2</sup> = 1 − 6 GeV<sup>2</sup> (ℓ = μ, e). The measurement shows an intriguing 2.6σ deviation from the Standard Model (SM) prediction. In view of this, we study model independent New Physics (NP) explanations of RK consistent with other measurements involving b → sℓ<sup>+</sup>ℓ<sup>−</sup> 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.
Hint of lepton flavour non-universality in B meson decays / Ghosh, D.; Nardecchia, M.; Renner, S. A.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2014:12(2014). [10.1007/JHEP12(2014)131]
Hint of lepton flavour non-universality in B meson decays
Nardecchia M.;
2014
Abstract
Abstract: The LHCb collaboration has recently presented their result on RK = ℬ(B+ → K+μ+μ−)/ ℬ(B+ → K+e+e−) for the dilepton invariant mass bin mℓℓ2 = 1 − 6 GeV2 (ℓ = μ, e). The measurement shows an intriguing 2.6σ deviation from the Standard Model (SM) prediction. In view of this, we study model independent New Physics (NP) explanations of RK 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
