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May 6 – 10, 2019
Canada/Pacific timezone

Implications for New Physics in b->smumu transitions after recent measurements by Belle and LHCb

May 7, 2019, 4:30 PM
Bob Wright, B150

Bob Wright, B150

Contributed Oral Rare Decays of Hadrons and Leptons Parallel session 1


Dr Dinesh Kumar (National Centre for Nuclear Research, Warsaw)


We present a Bayesian analysis of the implications for new physics in semileptonic b → s transitions after including new measurements of RK at LHCb and new determinations of RK∗ and RK∗+ at Belle. We perform global fits with 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 Z 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.

Primary author

Dr Dinesh Kumar (National Centre for Nuclear Research, Warsaw)

Presentation materials