https://doi.org/10.1140/epjc/s10052-015-3602-7
Regular Article - Theoretical Physics
New physics in 
transitions after LHC run 1
1
Perimeter Institute for Theoretical Physics, 31 Caroline St. N, Waterloo, ON, N2L 2Y5, Canada
2
Excellence Cluster Universe, TUM, Boltzmannstr. 2, 85748, Garching, Germany
* e-mail: david.straub@tum.de
Received:
8
May
2015
Accepted:
6
August
2015
Published online:
25
August
2015
We present results of global fits of all relevant experimental data on rare 
decays. We observe significant tensions between the Standard Model predictions and the data. After critically reviewing the possible sources of theoretical uncertainties, we find that within the Standard Model, the tensions could be explained if there are unaccounted hadronic effects much larger than our estimates. Assuming hadronic uncertainties are estimated in a sufficiently conservative way, we discuss the implications of the experimental results on new physics, both model independently as well as in the context of the minimal supersymmetric standard model and models with flavour-changing 
bosons. We discuss in detail the violation of lepton-flavour universality as hinted by the current data and make predictions for additional lepton-flavour-universality tests that can be performed in the future. We find that the ratio of the forward–backward asymmetries in 
and 
at low dilepton invariant mass is a particularly sensitive probe of lepton flavour universality and allows to distinguish between different new physics scenarios that give the best description of the current data.
© The Author(s), 2015
