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Reading the footprints of the B-meson flavor anomalies

Cornella, Claudia ; Faroughy, Darius A. ; Fuentes-Martín, Javier ; Isidori, Gino ; Neubert, Matthias

The journal of high energy physics, 2021-08, Vol.2021 (8), p.1-53, Article 50 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Reading the footprints of the B-meson flavor anomalies
Autor: Cornella, Claudia ; Faroughy, Darius A. ; Fuentes-Martín, Javier ; Isidori, Gino ; Neubert, Matthias
Assuntos: Anomalies ; Beyond Standard Model ; Broken symmetry ; Classical and Quantum Gravitation ; Couplings ; Decay ; Elementary Particles ; Field theory ; Flavor (particle physics) ; Heavy Quark Physics ; Hypotheses ; Large Hadron Collider ; Leptons ; Mesons ; Physics ; Physics and Astronomy ; Quantum Field Theories ; Quantum Field Theory ; Quantum Physics ; Quarks ; Regular Article - Theoretical Physics ; Relativity Theory ; Standard model (particle physics) ; String Theory ; Symmetry
É parte de: The journal of high energy physics, 2021-08, Vol.2021 (8), p.1-53, Article 50
Descrição: A bstract Motivated by the recent LHCb announcement of a 3 . 1 σ violation of lepton- flavor universality in the ratio R K = 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 → cτ ν ¯ ) 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 U 1 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 B s - 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 (*) ν ν ¯ ), and finally an updated analysis of collider bounds on the leptoquark mass and couplings.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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Reading the footprints of the B-meson flavor anomalies

Cornella, Claudia ; Faroughy, Darius A. ; Fuentes-Martín, Javier ; Isidori, Gino ; Neubert, Matthias

Berlin/Heidelberg: Springer Berlin Heidelberg

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