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Semileptonic B-physics anomalies: A general EFT analysis within U(2)n flavor symmetry


Bordone, Marzia; Isidori, Gino; Trifinopoulos, Sokratis (2017). Semileptonic B-physics anomalies: A general EFT analysis within U(2)n flavor symmetry. Physical review D, 96(1):015038.

Abstract

We analyze the recent hints of lepton flavor universality violations in semileptonic B decays within a general effective field theory (EFT) based on a U(2)n flavor symmetry acting on the light generations of Standard Model (SM) fermions. We analyze in particular the consistency of these anomalies with the tight constraints on various low-energy observables in B and τ physics. We show that, with a moderate fine-tuning, a consistent picture for all low-energy observables can be obtained under the additional dynamical assumption that the new physics (NP) sector is coupled preferentially to third-generation SM fermions. We discuss how this dynamical assumption can be implemented in general terms within the EFT, and we identify a series of observables in τ decays which could provide further evidence of this NP framework.

Abstract

We analyze the recent hints of lepton flavor universality violations in semileptonic B decays within a general effective field theory (EFT) based on a U(2)n flavor symmetry acting on the light generations of Standard Model (SM) fermions. We analyze in particular the consistency of these anomalies with the tight constraints on various low-energy observables in B and τ physics. We show that, with a moderate fine-tuning, a consistent picture for all low-energy observables can be obtained under the additional dynamical assumption that the new physics (NP) sector is coupled preferentially to third-generation SM fermions. We discuss how this dynamical assumption can be implemented in general terms within the EFT, and we identify a series of observables in τ decays which could provide further evidence of this NP framework.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Physics and Astronomy (miscellaneous)
Language:English
Date:28 July 2017
Deposited On:20 Dec 2018 11:54
Last Modified:28 Jul 2020 14:04
Publisher:American Physical Society
ISSN:2470-0010
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevd.96.015038

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