Emerging patterns of New Physics with and without Lepton Flavour Universal contributions
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Author(s)
Algueró, Marcel
Capdevila, Bernat
Crivellin, Andreas
Descotes-Genon, Sébastien
Masjuan, Pere
Matias, Joaquim
Virto, Javier
Date Issued
August 2019
Journal
European Physical Journal C
Publisher
Springer Science and Business Media LLC
Citation
Algueró, Marcel et al. "Emerging patterns of New Physics with and without Lepton Flavour Universal contributions." European Physical Journal C 79, 8 (August 2019): 714 © 2019 The Author(s)
Version
Final published version
Abstract
We perform a model-independent global fit to b→sℓ+ℓ- observables to confirm existing New Physics (NP) patterns (or scenarios) and to identify new ones emerging from the inclusion of the updated LHCb and Belle measurements of RK and RK∗, respectively. Our analysis, updating Refs. Capdevila et al. (J Virto JHEP 1801:093, 2018) and Algueró et al. (J Matias Phys Rev D 99(7):075017, 2019) and including these new data, suggests the presence of right-handed couplings encoded in the Wilson coefficients C9′μ and C10′μ. It also strengthens our earlier observation that a lepton flavour universality violating (LFUV) left-handed lepton coupling (C9μV=-C10μV), often preferred from the model building point of view, accommodates the data better if lepton-flavour universal (LFU) NP is allowed, in particular in C9U. Furthermore, this scenario with LFU NP provides a simple and model-independent connection to the cτν anomalies, showing a preference of ≈7σ with respect to the SM. It may also explain why fits to the whole set of b→sℓ+ℓ- data or to the subset of LFUV data exhibit stronger preferences for different NP scenarios. Finally, motivated by Z′ models with vector-like quarks, we propose four new scenarios with LFU and LFUV NP contributions that give a very good fit to data.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-019-7216-3
