publication . Article . Preprint . 2017

Patterns of New Physics in $b\to s\ell^+\ell^-$ transitions in the light of recent data

Capdevila, Bernat; Crivellin, Andreas; Descotes-Genon, Sébastien; Matias, Joaquim; Virto, Javier;

Open Access English

Published: 18 Apr 2017

Publisher: HAL CCSD

Country: France

Summary
References
76
Related research
11

Abstract

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 $b\to s\ell^+\ell^-$ data ($\ell=e,\mu$) 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 $5\,\sigma$ 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$\,\sigma$ level. We discuss the impact of LFU-violating New Physics on the observable $P_5^\prime$ from $B \to K^*\mu^+\mu^-$ 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.

Comment: 13 pages, 6 figures. Accepted for publication in JHEP

Subjects

arXiv: High Energy Physics::Experiment

free text keywords: lepton: flavor: violation, new physics, numerical calculations, CMS, ATLAS, BELLE, LHC-B, Wilson, effective Hamiltonian, B: branching ratio, B: semileptonic decay, universality: violation, Effective Field Theories, Heavy Quark Physics, lepton: flavor: universality, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics - Phenomenology, High Energy Physics - Experiment, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]

Related Organizations

Paul Scherrer Institute
Switzerland
Typologie et Universaux Linguistiques
France
Institut National des Sciences de l'Univers
France

Funded by

EC| RBI-T-WINNING, EC| ELUSIVES, EC| InvisiblesPlus, SNSF| Flavour Physics beyond the Standard Model

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Preprint . 2017

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HAL Descartes; HAL - UPEC / UPEM; HAL-Pasteur; Hyper Article en Ligne; HAL-Inserm; Mémoires en Sciences de l'Information et de la Communication; Hal-Diderot

Article . 2018

Providers: HAL Descartes; HAL - UPEC / UPEM; HAL-Pasteur; Hyper Article en Ligne; HAL-Inserm; Mémoires en Sciences de l'Information et de la Communication; Hal-Diderot

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