B-decay discrepancies after Moriond 2019
| Autor: | Jason Aebischer, Peter Stangl, Meril Reboud, David M. Straub, Diego Guadagnoli, Wolfgang Altmannshofer |
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| Přispěvatelé: | Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2020 |
| Předmět: |
operator: Wilson
Particle physics Physics and Astronomy (miscellaneous) Physics beyond the Standard Model FOS: Physical sciences lcsh:Astrophysics BELLE leptoquark Computer Science::Digital Libraries 01 natural sciences High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) effective field theory lepton: flavor: universality lcsh:QB460-466 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] Effective field theory quark: transition lcsh:Nuclear and particle physics. Atomic energy. Radioactivity Leptoquark fermion: operator 010306 general physics Engineering (miscellaneous) B/s: decay Physics Large Hadron Collider new physics 010308 nuclear & particles physics High Energy Physics::Phenomenology scale: electroweak interaction B: decay ATLAS LHC-B Universality (dynamical systems) High Energy Physics - Phenomenology [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] bottom: decay lcsh:QC770-798 High Energy Physics::Experiment strangeness: production renormalization group four-fermion interaction Electroweak scale Lepton |
| Zdroj: | European Physical Journal C: Particles and Fields European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2020, 80 (3), pp.252. ⟨10.1140/epjc/s10052-020-7817-x⟩ European Physical Journal European Physical Journal C: Particles and Fields, Vol 80, Iss 3, Pp 1-27 (2020) |
| ISSN: | 1434-6052 1434-6044 |
| DOI: | 10.1140/epjc/s10052-020-7817-x |
| Popis: | Following the updated measurement of the lepton flavour universality (LFU) ratio R_K in B -> Kll decays by LHCb, as well as a number of further measurements, e.g. R_K* by Belle and B_s -> mu mu by ATLAS, we analyse the global status of new physics in b -> s transitions in the weak effective theory at the b-quark scale, in the Standard Model effective theory at the electroweak scale, and in simplified models of new physics. We find that the data continues to strongly prefer a solution with new physics in semi-leptonic Wilson coefficients. A purely muonic contribution to the combination C_9 = -C_10, well suited to UV-complete interpretations, is now favoured with respect to a muonic contribution to C_9 only. An even better fit is obtained by allowing an additional LFU shift in C_9. Such a shift can be renormalization-group induced from four-fermion operators above the electroweak scale, in particular from semi-tauonic operators, able to account for the potential discrepancies in b -> c transitions. This scenario is naturally realized in the simplified U_1 leptoquark model. We also analyse simplified models where a LFU effect in b -> sll is induced radiatively from four-quark operators and show that such a setup is on the brink of exclusion by LHC di-jet resonance searches. 41 pages, 20 figures, 3 tables. Originally presented at Moriond EW 2019 on March 22, 2019. v2: Numerics updated including the Belle RD(*) update, clarifications and references added |
| Databáze: | OpenAIRE |
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