Eur. Phys. J. C (2016) 76: 161
https://doi.org/10.1140/epjc/s10052-016-3993-0

Regular Article - Theoretical Physics

Flavour-changing Higgs couplings in a class of two Higgs doublet models

¹ Departament de Física Teòrica and IFIC, Universitat de València-CSIC, 46100, Burjassot, Spain
² Departamento de Física and Centro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico (IST), U. de Lisboa (UL), Av. Rovisco Pais, 1049-001, Lisbon, Portugal
³ Centro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico (IST), U. de Lisboa (UL), Av. Rovisco Pais, 1049-001, Lisbon, Portugal

^* e-mail: rebelo@tecnico.ulisboa.pt
^** e-mail: nebot@cftp.ist.utl.pt

Received: 20 September 2015
Accepted: 29 February 2016
Published online: 23 March 2016

Abstract

We analyse various flavour-changing processes like , as well as hadronic decays , in the framework of a class of two Higgs doublet models where there are flavour-changing neutral scalar currents at tree level. These models have the remarkable feature of having these flavour-violating couplings entirely determined by the CKM and PMNS matrices as well as . The flavour structure of these scalar currents results from a symmetry of the Lagrangian and therefore it is natural and stable under the renormalisation group. We show that in some of the models the rates of the above flavour-changing processes can reach the discovery level at the LHC at 13 TeV even taking into account the stringent bounds on low energy processes, in particular .