English

Physical Constraints on a Class of Two-Higgs Doublet Models with FCNC at tree level

High Energy Physics - Phenomenology 2015-06-18 v2 High Energy Physics - Experiment

Abstract

We analyse the constraints and some of the phenomenological implications of a class of two Higgs doublet models where there are flavour-changing neutral currents (FCNC) at tree level but the potentially dangerous FCNC couplings are suppressed by small entries of the CKM matrix VV. This class of models have the remarkable feature that, as a result of a discrete symmetry of the Lagrangian, the FCNC couplings are entirely fixed in the quark sector by VV and the ratio v2/v1v_2 /v_1 of the vevs of the neutral Higgs. The discrete symmetry is extended to the leptonic sector, so that there are FCNC in the leptonic sector with their flavour structure fixed by the leptonic mixing matrix. We analyse a large number of processes, including decays mediated by charged Higgs at tree level, processes involving FCNC at tree level, as well as loop induced processes. We show that in this class of models one has new physical scalars beyond the standard Higgs boson, with masses reachable at the next round of experiments.

Keywords

Cite

@article{arxiv.1401.6147,
  title  = {Physical Constraints on a Class of Two-Higgs Doublet Models with FCNC at tree level},
  author = {F. J. Botella and G. C. Branco and Adrian Carmona and M. Nebot and Leonardo Pedro and M. N. Rebelo},
  journal= {arXiv preprint arXiv:1401.6147},
  year   = {2015}
}

Comments

33 pages, 9 figures, 6 tables; corrected typos, improved results, minor changes in the text. Matches version accepted for publication