Are we overlooking lepton-flavor-universal new physics in b →s ?

Marcel Algueró, Bernat Capdevila, Sébastien Descotes-Genon, Pere Masjuan, Joaquim Matias

Research output: Contribution to journalArticleResearch

47 Citations (Scopus)


© 2019 authors. Published by the American Physical Society.r(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3 . The deviations with respect to the Standard Model that are currently observed in b→s transitions (the so-called flavor anomalies) can be interpreted in terms of different new physics (NP) scenarios within a model-independent effective approach. We reconsider the determination of NP in global fits from a different perspective by removing one implicit hypothesis of current analyses, namely, that NP is only lepton-flavor-universality violating (LFUV). We examine the roles played by LFUV NP and lepton-flavor-universal NP altogether, providing new directions to identify the possible theory beyond the SM responsible for the anomalies observed. New patterns of NP emerge due to the possibility of allowing at the same time large LFUV and lepton-flavor-universal NP contributions to C10μ, which provides a different mechanism to obey the constraint from the Bs→μ+μ- branching ratio. In this landscape of NP, we discuss how to discriminate among these scenarios in the short term, thanks to current and forthcoming observables. While the update of RK will be a major milestone to confirm the NP origin of the flavor anomalies, additional observables, in particular the LFUV angular observable Q5, turn out to be central to assessing the precise NP scenario responsible for the observed anomalies.
Original languageEnglish
Article number075017
JournalPhysical Review D
Issue number7
Publication statusPublished - 1 Apr 2019


Dive into the research topics of 'Are we overlooking lepton-flavor-universal new physics in b →s ?'. Together they form a unique fingerprint.

Cite this