Abstract
Flavour physics observables are excellent probes of new physics up to very high energy scales. Here we present FlavBit, the dedicated flavour physics module of the global-fitting package GAMBIT. FlavBit includes custom implementations of various likelihood routines for a wide range of flavour observables, including detailed uncertainties and correlations associated with LHCb measurements of rare, leptonic and semileptonic decays of B and D mesons, kaons and pions. It provides a generalised interface to external theory codes such as SuperIso, allowing users to calculate flavour observables in and beyond the Standard Model, and then test them in detail against all relevant experimental data. We describe FlavBit and its constituent physics in some detail, then give examples from supersymmetry and effective field theory illustrating how it can be used both as a standalone library for flavour physics, and within GAMBIT.
Highlights
Precise measurement of flavour observables is a powerful indirect probe of physics beyond the Standard Model (SM), as new heavy particles predicted by extensions of the SM can contribute to the amplitudes of observables as virtual particles
In this article we present FlavBit, a flavour physics library designed in the context of the Global And Modular BSM Inference Tool (GAMBIT) framework [4], and usable in standalone form
These are largely driven by the B0 → K ∗μ+μ− angular observables, with the corresponding component of the best-fit likelihood improved by Δ ln L = 13.2 with respect to the SM, and Δ ln L = 9.8 compared to the Constrained MSSM (CMSSM)
Summary
Precise measurement of flavour observables is a powerful indirect probe of physics beyond the Standard Model (SM), as new heavy particles predicted by extensions of the SM can contribute to the amplitudes of observables as virtual particles. The resulting likelihoods can be incorporated into the GAMBIT global likelihood to scan the parameter spaces of various models for new physics [4,8,9,10,11], taking into account complementary constraints from direct production [12], dark matter searches [13], and SM and related precision measurements [14]. It is still unclear if these might be accommodated in the SM by larger-than-expected QCD effects, statistical fluctuations or some combination thereof These tensions certainly provide motivation for continued interest and effort in careful combination and cross-correlation of flavour observables with each other, and with searches for new physics in other sectors. The FlavBit source code is freely available from gambit.hepforge.org under the terms of the standard 3-clause BSD license.
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