https://doi.org/10.1140/epjc/s10052-019-7092-x
Regular Article - Theoretical Physics
Some results on lepton flavour universality violation
1
Departamento de Física Teórica, Facultad de Ciencias, Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain
2
Departament de Física Quàntica i Astrofísica, Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona, Martí i Franquès 1, 08028, Barcelona, Catalonia, Spain
* e-mail: siannah@unizar.es
Received:
27
June
2018
Accepted:
1
July
2019
Published online:
12
July
2019
Motivated by recent experimental measurements on flavour physics, in tension with Standard Model predictions, we perform an updated analysis of new physics violating lepton flavour universality, by using the effective Lagrangian approach and in the 
and 
leptoquark models. We explicitly analyze the impact of considering complex Wilson coefficients in the analysis of B-anomalies, by performing a global fit of 
and 
observables, together with 
and 
. The inclusion of complex couplings provides a slightly improved global fit, and a marginally improved prediction.
© The Author(s), 2019
