2019/03/31 by Kamila Kowalska, Dinesh Kumar, Enrico Maria Sessolo · 2 citations
Computer Science · Physics and Astronomy · #Bayes factor #Bayesian probability #Bayesian statistics #Computational Physics and Python Applications #Credibility #Fermion #Large Hadron Collider #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Scalar (mathematics) #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-019-7330-2
published as Eur. Phys. J. C (2019) 79: 840 · 22 pages, 6 figures, 23 tables. v3: Minor modifications to the text, references added. Published version
openalex created_date 2019/04/01 · openalex publication_date 2019/10/01 · arxiv created 2019/10/14 · arxiv updated 2019/10/15 · openalex updated_date 2026/08/05
Abstract We present a Bayesian analysis of the implications for new physics in semileptonic b→ s <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>b</mml:mi><mml:mo>→</mml:mo><mml:mi>s</mml:mi></mml:mrow></mml:math> transitions after including new measurements of RK <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>R</mml:mi><mml:mi>K</mml:mi></mml:msub></mml:math> at LHCb and new determinations of RK^* <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>R</mml:mi><mml:msup><mml:mi>K</mml:mi><mml:mo>∗</mml:mo></mml:msup></mml:msub></mml:math> and RK*+ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>R</mml:mi><mml:msup><mml:mi>K</mml:mi><mml:mrow><mml:mrow/><mml:mo>∗</mml:mo><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:msub></mml:math> 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' <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>Z</mml:mi><mml:msup><mml:mrow/><mml:mo>′</mml:mo></mml:msup></mml:msup></mml:math> 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.