Regular Article - Theoretical Physics
Implications for new physics in transitions after recent measurements by Belle and LHCb
National Centre for Nuclear Research, Pasteura 7, 02-093, Warsaw, Poland
* e-mail: email@example.com
Accepted: 23 September 2019
Published online: 11 October 2019
We present a Bayesian analysis of the implications for new physics in semileptonic transitions after including new measurements of at LHCb and new determinations of and at Belle. We perform global fits with 1, 2, 4, and 8 input Wilson coefficients, plus one CKM nuisance parameter to take into account uncertainties that are not factorizable. We infer the 68% and 95.4% credibility regions of the marginalized posterior probability density for all scenarios and perform comparisons of models in pairs by calculating the Bayes factor given a common data set. We then proceed to analyzing a few well-known BSM models that can provide a high energy framework for the EFT analysis. These include the exchange of a heavy boson in models with heavy vector-like fermions and a scalar field, and a model with scalar leptoquarks. We provide predictions for the BSM couplings and expected mass values.
© The Author(s), 2019