Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/178800
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dc.contributor.authorCoy, Rupert-
dc.contributor.authorFrigerio, Michele-
dc.contributor.authorMescia, Federico-
dc.contributor.authorSumensari, Olcyr-
dc.date.accessioned2021-07-02T16:30:52Z-
dc.date.available2021-07-02T16:30:52Z-
dc.date.issued2020-01-23-
dc.identifier.issn1434-6044-
dc.identifier.urihttps://hdl.handle.net/2445/178800-
dc.description.abstractWe 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.-
dc.format.extent15 p.-
dc.format.mimetypeapplication/pdf-
dc.language.isoeng-
dc.publisherSocietà Italiana di Fisica & Springer Verlag-
dc.relation.isformatofReproducció del document publicat a: https://doi.org/10.1140/epjc/s10052-019-7581-y-
dc.relation.ispartofEuropean Physical Journal C, 2020, vol. 80, num. 52-
dc.relation.urihttps://doi.org/10.1140/epjc/s10052-019-7581-y-
dc.rightscc-by (c) Coy, Rupert et al., 2020-
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/-
dc.sourceArticles publicats en revistes (Física Quàntica i Astrofísica)-
dc.subject.classificationModel estàndard (Física nuclear)-
dc.subject.classificationTeoria de camps (Física)-
dc.subject.otherStandard model (Nuclear physics)-
dc.subject.otherField theory (Physics)-
dc.titleNew physics in b→sℓℓ transitions at one loop-
dc.typeinfo:eu-repo/semantics/article-
dc.typeinfo:eu-repo/semantics/publishedVersion-
dc.identifier.idgrec696372-
dc.date.updated2021-07-02T16:30:53Z-
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess-
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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