publication . Article . 2018

Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data

Capdevila, Bernat; Crivellin, Andreas; Descotes-Genon, Sébastien; Matias, Joaquim; Virto, Javier;
Open Access English
  • Published: 19 Jan 2018 Journal: Journal of High Energy Physics, volume 2,018, issue 1, pages 1-22 (issn: 1029-8479, Copyright policy)
  • Publisher: SpringerOpen
  • Country: United States
In the Standard Model (SM), the rare transitions where a bottom quark decays into a strange quark and a pair of light leptons exhibit a potential sensitivity to physics beyond the SM. In addition, the SM embeds Lepton Flavour Universality (LFU), leading to almost identical probabilities for muon and electron modes. The LHCb collaboration discovered a set of deviations from the SM expectations in decays to muons and also in ratios assessing LFU. Other experiments (Belle, ATLAS, CMS) found consistent measurements, albeit with large error bars. We perform a global fit to all available b → sℓ+ℓ− data (ℓ = e, μ) in a model-independent way allowing for different patterns of New Physics. For the first time, the NP hypothesis is preferred over the SM by 5 σ in a general case when NP can enter SM-like operators and their chirally-flipped partners. LFU violation is favoured with respect to LFU at the 3-4 σ level. We discuss the impact of LFU-violating New Physics on the observable P5 from B → K∗μ+μ− and we compare our estimate for long-distance charm contributions with an empirical model recently proposed by a group of LHCb experimentalists. Finally, we discuss NP models able to describe this consistent pattern of deviations.
Swiss National Science Foundation (Ambizione Grant PZ00P2 154834)
Centro de Excelencia Severo Ochoa (SEV-2012-023)
European Union. HORIZON 2020 (grants No 692194)
European Union. HORIZON 2020 (grants No 674896)
European Union. HORIZON 2020 (grants No 690575)
Swiss National Science Foundation
grant FPA2014-61478-EXP
Persistent Identifiers
arXiv: High Energy Physics::Experiment
free text keywords: Effective Field Theories, Heavy Quark Physics, Nuclear and High Energy Physics, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, lcsh:QC770-798, Bottom quark, Physics beyond the Standard Model, Electron, Lepton, Observable, Physics, Universality (dynamical systems), Muon, Particle physics, Strange quark
Funded by
EC| InvisiblesPlus
  • Funder: European Commission (EC)
  • Project Code: 690575
  • Funding stream: H2020 | MSCA-RISE
Validated by funder
Ruđer Bošković Institute: Twinning for a step forward of the Theoretical Physics Division
  • Funder: European Commission (EC)
  • Project Code: 692194
  • Funding stream: H2020 | CSA
SNSF| Flavour Physics beyond the Standard Model
  • Funder: Swiss National Science Foundation (SNSF)
  • Project Code: PZ00P2_154834
  • Funding stream: Careers | Ambizione
The Elusives Enterprise: Asymmetries of the Invisible Universe
  • Funder: European Commission (EC)
  • Project Code: 674896
  • Funding stream: H2020 | MSCA-ITN-ETN

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