# EPS-HEP2019

Jul 10 – 17, 2019
Ghent
Europe/Brussels timezone

## Implications for New Physics in $b\to s \mu\mu$ transitions after recent measurements by Belle and LHCb

Jul 13, 2019, 11:20 AM
20m
Campus Ledeganck - Aud. 5 (Ghent)

### Campus Ledeganck - Aud. 5

#### Ghent

Parallel talk Flavour Physics and CP Violation

### Speaker

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

### Description

We present a Bayesian analysis of the implications for new physics in semileptonic $b\to s$ transitions after including new measurements of $R_K$ at LHCb and new determinations of $R_{K^*}$ and $R_{K^{*+}}$ 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 $Z^{'}$ 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)

### Co-authors

Enrico Maria Sessolo (NCBJ, Warsaw) Dr Kamila Kowalska (National Centre for Nuclear Research, Warsaw, Poland)