https://doi.org/10.1140/epjc/s10052-018-6437-1
Regular Article - Theoretical Physics
Recent 
physics anomalies: a first hint for compositeness?
1
PRISMA Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099, Mainz, Germany
2
Theoretical Physics Department, CERN, 1 Esplanade des Particules, 1211, Geneva 23, Switzerland
3
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117, Heidelberg, Germany
* e-mail: fgoertz@mpi-hd.mpg.de
Received:
5
September
2018
Accepted:
10
November
2018
Published online:
26
November
2018
We scrutinize the recently further strengthened hints for new physics in semileptonic B-meson decays, focusing on the ‘clean’ ratios of branching fractions 
and 
and examining to which pattern of new effects they point to. We explore in particular the hardly considered, yet fully viable, option of new physics in the right-handed electron sector and demonstrate how a recently proposed framework of leptons in composite Higgs setups naturally solves both the and anomalies via a peculiar structure of new physics effects, predicted by minimality of the model and the scale of neutrino masses. Finally, we also take into account further observables, such as 
, 
, and angular observables in 
decays, to arrive at a comprehensive picture of the model concerning (semileptonic) B decays. We conclude that – since it is in good agreement with the experimental situation in flavor physics and also allows to avoid ultra-light top partners – the model furnishes a very promising scenarios of Higgs compositeness in the light of LHC data.
© The Author(s), 2018
