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http://hdl.handle.net/2445/178800
Title: | New physics in b→sℓℓ transitions at one loop |
Author: | Coy, Rupert Frigerio, Michele Mescia, Federico Sumensari, Olcyr |
Keywords: | Model estàndard (Física nuclear) Teoria de camps (Física) Standard model (Nuclear physics) Field theory (Physics) |
Issue Date: | 23-Jan-2020 |
Publisher: | Società Italiana di Fisica & Springer Verlag |
Abstract: | We investigate new-physics contributions to b→sℓℓ transitions in the context of an effective field theory extension of the Standard Model, including operator mixing at one loop. We identify the few scenarios where a single Wilson coefficient, C/Λ2∼1/TeV2, induces a substantial shift in the lepton flavour universality ratios RK and RK∗ at one loop, while evading Z-pole precision tests, collider bounds, and other flavour constraints. Novel fits to the present data are achieved by a left-handed current operator with quark-flavour indices (2, 2) or (3, 3). Interestingly, the running of the Standard Model Yukawa matrices gives the dominant effect for these scenarios. We match the favoured effective-theory scenarios to minimal, single-mediator models, which are subject to additional stringent constraints. Notably, we recognise three viable instances of a leptoquark with one coupling to fermions only. If the anomalies were confirmed, it appears that one-loop explanations have good prospects of being directly tested at the LHC. |
Note: | Reproducció del document publicat a: https://doi.org/10.1140/epjc/s10052-019-7581-y |
It is part of: | European Physical Journal C, 2020, vol. 80, num. 52 |
URI: | http://hdl.handle.net/2445/178800 |
Related resource: | https://doi.org/10.1140/epjc/s10052-019-7581-y |
ISSN: | 1434-6044 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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