Hint of lepton flavour non-universality in B meson decays

By D. Ghosh, Marco Nardecchia, S. Renner. 2014

183 citations recorded by the source corpus.

A bstractThe 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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/19c899e05d28b16d0aa25e558684a7de0b3ad1a7

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In Nuclear and High Energy Physics

Citations in the corpus

Lepton universality violation with lepton flavor conservation in B-meson decays (2015, background): “The appearance of all the aforementioned anomalies has prompted intense theoretical activity (see for example [5, 7, 21, 22, 24–42]).”
Rare $B$ Decays as Tests of the Standard Model (2016, background): “[C (′) 9,10] e s have been performed in [193, 251, 243] (see also [337]).”
Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data (2017, background): “We consider the large-recoil limit and we work under the hypothesis that New Physics enters in muon modes and is suppressed for electrons [2, 42].”
Flavour anomalies after the RK∗ measurement (2017, methodology): “the bound |c bLbL | < 1/(210 TeV) 2 [30, 31].”
Lepton flavor non-universality in B-meson decays from a U(2) flavor model (2015, background): “While new physics in the muonic sector alone gives the most economical explanation of the LHCb anomalies (including RK [12, 14]), it has been emphasized that large corrections in electron channels are not only allowed but could also (slightly) improve the goodness of the global fit [13].”
On the breaking of lepton flavor universality in B decays (2015, unknown): “[14–31].”
Diagnosing lepton-nonuniversality in b → sℓℓ (2014, background): “The available experimental and theoretical analyses on B̄ → K̄(∗)μμ are much more sophisticated than their electron counterparts, and are subject to correlations [18–21], and more recently [9, 11, 13].”