Hint of lepton flavour non-universality in B meson decays

Ghosh, Diptimoy; Nardecchia, Marco; Renner, Sophie

doi:10.1007/jhep12(2014)131

Cited by 151 publications

(159 citation statements)

References 61 publications

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“…The observed decay rate for B 0 s → µ + µ − is slightly below, but compatible with the SM prediction [11]. While none of these LHCb anomalies by themselves are significant enough to claim a discovery, it is intriguing that they point to a common Lorentz structure when interpreted as a signal of NP [12][13][14][15][16][17]. A simultaneous explanation of ∆a µ , however, requires more sophisticated model building.…”

Section: Introductionmentioning

confidence: 65%

Dark matter relic from muon anomalies

2015

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We show that the recently reported anomalies in b → sµ + µ − transitions, as well as the longstanding gµ − 2 discrepancy, can be addressed simultaneously by a new massive abelian gauge boson with loop-induced coupling to muons. Such a scenario typically leads to a stable dark matter candidate with a thermal relic density close to the observed value. Dark matter in our model couples dominantly to leptons, hence signals in direct detection experiments lie well below the current sensitivity. The LHC, in combination with indirect detection searches, can test this scenario through distinctive signatures with muon pairs and missing energy.

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Section: Introductionmentioning

confidence: 65%

Dark matter relic from muon anomalies

2015

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“…1 Previous measurements [3,4] had significantly larger uncertainties and were consistent with the SM prediction, which is R K = 1 to an excellent approximation [5]. Theory interpretations of the recent R K data are given in [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 69%

“…The available experimental and theoretical analyses onB →K ( * ) µµ are much more sophisticated than their electron counterparts, and are subject to correlations [18][19][20][21], and more recently [9,11,13]. Adopting the results of [11] which include R K data but assume real Wilson coefficients, the allowed ranges at 95 % CL are roughly LHCb's upcoming 3fb −1 analysis ofB →K * µµ data should significantly improve the muon bounds.…”

Section: Experimental Constraints On the Chiral Wilson Coefficientsmentioning

confidence: 99%

“…These asymmetries are effectively nulltests of the SM because of the smallness of V ub V * us /(V tb V * ts ). The asymmetries A (D) 7,8,9 , which can be obtained from an angular analysis (see appendix B) are particularly promising because they are naive T-odd and hence do not require strong phases. They exhibit the following features: A 9 is sensitive to right-handed currents, A D 7 is sensitive to C ( ) 10 , and A…”

Section: Cp Violationmentioning

confidence: 99%

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Diagnosing lepton-nonuniversality in b → sℓℓ

Hiller

Schmaltz

2015

J. High Energ. Phys.

125

111

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Ratios of branching fractions of semileptonic B decays, (B → Hµµ) over (B → Hee) with H = K, K * , X s , K 0 (1430), φ, . . . are sensitive probes of lepton universality. In the Standard Model, the underlying flavor changing neutral current process b → s is lepton flavor universal. However models with new flavor violating physics above the weak scale can give substantial non-universal contributions. The leading contributions from such new physics can be parametrized by effective dimension six operators involving left-or right-handed quarks. We show that in the double ratios R Xs /R K , R K * /R K and R φ /R K the dependence on new physics coupling to left-handed quarks cancels out. Thus a measurement of any of these double ratios is a clean probe of flavor nonuniversal physics coupling to right-handed quarks. We also point out that the observables R Xs , R K * , R K 0 (1430) and R φ depend on the same combination of Wilson coefficients and therefore satisfy simple consistency relations.

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“…We obtain that the maximal allowed values can be quite large, namely, 6) and could be an opportunity for future experiments.…”

Section: Jhep08(2017)104mentioning

confidence: 81%

A leptoquark model to accommodate R K exp < R K SM and R K ∗ exp < R K ∗

Bečirević

Sumensari

2017

J. High Energ. Phys.

125

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Abstract:We show that a modification of the model with a low energy scalar leptoquark state carrying hypercharge Y = 7/6 allows to accommodate both R K < 1 and R K * < 1, through loop effects, consistent with recent observations made at LHCb. We describe details of the model, compute the relevant Wilson coefficient and, after discussing a number of constraints, we examine the phenomenological consequences of the model. The bounds on the lepton flavor violating decay rates, induced by this model, include B(Z → µτ ) O(10 −7 ), and B(B → Kµτ ) O(10 −9 ). We also comment on the interpretation of the bounds on the leptoquark mass obtained from the direct searches at LHC.

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Hint of lepton flavour non-universality in B meson decays

Cited by 151 publications

References 61 publications

Dark matter relic from muon anomalies

Dark matter relic from muon anomalies

Diagnosing lepton-nonuniversality in b → sℓℓ

A leptoquark model to accommodate R K exp < R K SM and R K ∗ exp < R K ∗

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