Abstract
Motivated by the recent LHCb announcement of a 3.1σ violation of lepton- flavor universality in the ratio RK = Γ(B → Kμ+μ−)/Γ(B → Ke+e−), we present an updated, comprehensive analysis of the flavor anomalies seen in both neutral-current (b → sℓ+ℓ−) and charged-current (b → \( c\tau \overline{\nu} \)) decays of B mesons. Our study starts from a model-independent effective field-theory approach and then considers both a simplified model and a UV-complete extension of the Standard Model featuring a vector leptoquark U1 as the main mediator of the anomalies. We show that the new LHCb data corroborate the emerging pattern of a new, predominantly left-handed, semileptonic current-current interaction with a flavor structure respecting a (minimally) broken U(2)5 flavor symmetry. New aspects of our analysis include a combined analysis of the semileptonic operators involving tau leptons, including in particular the important constraint from Bs-\( {\overline{B}}_s \) mixing, a systematic study of the effects of right-handed leptoquark couplings and of deviations from minimal flavor-symmetry breaking, a detailed analysis of various rare B-decay modes which would provide smoking-gun signatures of this non-standard framework (LFV decays, di-tau modes, and B → K(*)\( \nu \overline{\nu} \)), and finally an updated analysis of collider bounds on the leptoquark mass and couplings.
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Cornella, C., Faroughy, D.A., Fuentes-Martín, J. et al. Reading the footprints of the B-meson flavor anomalies. J. High Energ. Phys. 2021, 50 (2021). https://doi.org/10.1007/JHEP08(2021)050
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DOI: https://doi.org/10.1007/JHEP08(2021)050