Cargando…

Implications for new physics in $b\rightarrow s \mu \mu $ transitions after recent measurements by Belle and LHCb

We present a Bayesian analysis of the implications for new physics in semileptonic $b\rightarrow s$ 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...

Descripción completa

Detalles Bibliográficos
Autores principales: Kowalska, Kamila, Kumar, Dinesh, Sessolo, Enrico Maria
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:https://dx.doi.org/10.1140/epjc/s10052-019-7330-2
http://cds.cern.ch/record/2695075
Descripción
Sumario:We present a Bayesian analysis of the implications for new physics in semileptonic $b\rightarrow s$ 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.