Lepton flavour universality in τ decays

Selimovic, N. (2023) Lepton flavour universality in τ decays. Il nuovo cimento C, 46 (1). pp. 1-8. ISSN 1826-9885

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The evidence for Lepton Flavour Universality (LFU) violation in semileptonic B-decays has been rising over the past few years. Relying on generic effective field theory (EFT) results, it has been shown that models addressing the B-anomalies necessarily lead, at one-loop, to deviations from LFU in τ decays at the few per-mil level. Once a (renormalizable) UV model is specified, the leading-log EFT result receives finite corrections from the matching at the UV scale. We discuss such corrections in a motivated class of models for the B-anomalies, based on an extended SU(4) × SU(3) × SU(2) × U(1) gauge sector. In this scenario, we obtain precise predictions for the effective W-boson and Z-boson couplings to leptons in terms of the masses and couplings of the new heavy fields. We confirm a few per-mil deviation from universality, within reach of future high-precision experiments.

Item Type: Article
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 07 Feb 2023 15:10
Last Modified: 07 Feb 2023 15:10
URI: http://eprints.bice.rm.cnr.it/id/eprint/22254

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