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https://hdl.handle.net/2445/178800
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DC Field | Value | Language |
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dc.contributor.author | Coy, Rupert | - |
dc.contributor.author | Frigerio, Michele | - |
dc.contributor.author | Mescia, Federico | - |
dc.contributor.author | Sumensari, Olcyr | - |
dc.date.accessioned | 2021-07-02T16:30:52Z | - |
dc.date.available | 2021-07-02T16:30:52Z | - |
dc.date.issued | 2020-01-23 | - |
dc.identifier.issn | 1434-6044 | - |
dc.identifier.uri | https://hdl.handle.net/2445/178800 | - |
dc.description.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. | - |
dc.format.extent | 15 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Società Italiana di Fisica & Springer Verlag | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1140/epjc/s10052-019-7581-y | - |
dc.relation.ispartof | European Physical Journal C, 2020, vol. 80, num. 52 | - |
dc.relation.uri | https://doi.org/10.1140/epjc/s10052-019-7581-y | - |
dc.rights | cc-by (c) Coy, Rupert et al., 2020 | - |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Model estàndard (Física nuclear) | - |
dc.subject.classification | Teoria de camps (Física) | - |
dc.subject.other | Standard model (Nuclear physics) | - |
dc.subject.other | Field theory (Physics) | - |
dc.title | New physics in b→sℓℓ transitions at one loop | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 696372 | - |
dc.date.updated | 2021-07-02T16:30:53Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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File | Description | Size | Format | |
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696372.pdf | 1.75 MB | Adobe PDF | View/Open |
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