Eur. Phys. J. C (2017) 77: 786
https://doi.org/10.1140/epjc/s10052-017-5157-2

Special Article - Tools for Experiment and Theory

FlavBit: a GAMBIT module for computing flavour observables and likelihoods

¹ Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn, 53115, Bonn, Germany
² Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
³ H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, 31-342, Kraków, Poland
⁴ Department of Physics, University of Oslo, 0316, Oslo, Norway
⁵ Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, 10691, Stockholm, Sweden
⁶ Department of Physics, Stockholm University, 10691, Stockholm, Sweden
⁷ Department of Physics, University of Adelaide, Adelaide, SA, 5005, Australia
⁸ Australian Research Council Centre of Excellence for Particle Physics at the Tera-scale, Australia, http://www.coepp.org.au/
⁹ NORDITA, Roslagstullsbacken 23, 10691, Stockholm, Sweden
¹⁰ Univ Lyon, Univ Lyon 1, ENS de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574, 69230, Saint-Genis-Laval, France
¹¹ Theoretical Physics Department, CERN, 1211, Geneva 23, Switzerland
¹² LAPTh, Université de Savoie, CNRS, 9 chemin de Bellevue, B.P.110, 74941, Annecy-le-Vieux, France
¹³ Department of Physics, Harvard University, Cambridge, MA, 02138, USA
¹⁴ Department of Physics, Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, UK
¹⁵ GRAPPA, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands

^* e-mail: p.scott@imperial.ac.uk

Received: 18 April 2017
Accepted: 22 August 2017
Published online: 21 November 2017

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.