https://doi.org/10.1140/epjc/s10052-019-7216-3
Regular Article - Theoretical Physics
Emerging patterns of New Physics with and without Lepton Flavour Universal contributions
1
Grup de Física Teòrica (Departament de Física), Universitat Autònoma de Barcelona, 08193, Bellaterra, Barcelona, Spain
2
Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, 08193, Bellaterra, Barcelona, Spain
3
Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
4
Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
5
Laboratoire de Physique Théorique, UMR 8627, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405, Orsay Cedex, France
6
Physics Department T31, Technische Universität München, James Franck-Strasse 1, 85748, Garching, Germany
7
Center for Theoretical Physics, Massachusetts Institute of Technology, 77 Massachusetts Av., Cambridge, MA, 02139, USA
* e-mail: bcapdevila@ifae.es
Received:
27
May
2019
Accepted:
31
July
2019
Published online:
24
August
2019
We perform a model-independent global fit to 
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 
and 
, 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 
and 
. It also strengthens our earlier observation that a lepton flavour universality violating (LFUV) left-handed lepton coupling (
), often preferred from the model building point of view, accommodates the data better if lepton-flavour universal (LFU) NP is allowed, in particular in 
. Furthermore, this scenario with LFU NP provides a simple and model-independent connection to the 
anomalies, showing a preference of 
with respect to the SM. It may also explain why fits to the whole set of data or to the subset of LFUV data exhibit stronger preferences for different NP scenarios. Finally, motivated by 
models with vector-like quarks, we propose four new scenarios with LFU and LFUV NP contributions that give a very good fit to data.
© The Author(s), 2019
