Nov 26 – 30, 2018
Europe/Vienna timezone

Vacuum Induced CP Violation Generating a Complex CKM Matrix with Controlled Scalar FCNC

Nov 27, 2018, 9:35 AM


Austrian Academy of Sciences, Dr.-Ignaz-Seipel-Platz 2, 1010 Vienna, AUSTRIA
Non-Invited Talk [5] Discrete symmetries and models of flavour mixing Plenary


Dr Miguel Nebot Gomez (CFTP-IST Lisbon)


A viable minimal model with spontaneous CP violation in the framework of a Two Higgs Doublet Model is introduced. The model is based on a generalised Branco-Grimus-Lavoura model with a flavoured $Z_2$ symmetry, under which two of the quark families are even and the third one is odd. The lagrangian respects CP invariance, while the vacuum has a CP violating phase, which is able to generate a complex CKM matrix. Scalar mediated flavour changing neutral couplings are carefully studied, pointing in particular to a deep connection between the generation of a complex CKM matrix from a vacuum phase and the appearance of scalar FCNC. The scalar sector is also presented in detail, showing that the new scalars are necessarily lighter than 1 TeV. A complete analysis of the model including the most relevant constraints is performed, showing that it is viable and that it has definite implications for the observation of New Physics signals in, for example, flavour changing Higgs decays or the discovery of the new scalars at the LHC. Special emphasis is given to processes like $t\to h c,h u$, as well as $h\to bs, bd$, which are relevant for the LHC and the ILC.

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Dr Miguel Nebot Gomez (CFTP-IST Lisbon)

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