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Roman Pasechnik

Senior lecturer

Typical working day..

CP4 miracle : shaping Yukawa sector with CP symmetry of order four

Author

  • P. M. Ferreira
  • Igor P. Ivanov
  • Enrique Jiménez
  • Roman Pasechnik
  • Hugo Serôdio

Summary, in English

We explore the phenomenology of a unique three-Higgs-doublet model based on the single CP symmetry of order 4 (CP4) without any accidental symmetries. The CP4 symmetry is imposed on the scalar potential and Yukawa interactions, strongly shaping both sectors of the model and leading to a very characteristic phenomenology. The scalar sector is analyzed in detail, and in the Yukawa sector we list all possible CP4-symmetric structures which do not run into immediate conflict with experiment, namely, do not lead to massless or mass-degenerate quarks nor to insufficient mixing or CP -violation in the CKM matrix. We show that the parameter space of the model, although very constrained by CP4, is large enough to comply with the electroweak precision data and the LHC results for the 125 GeV Higgs boson phenomenology, as well as to perfectly reproduce all fermion masses, mixing, and CP violation. Despite the presence of flavor changing neutral currents mediated by heavy Higgs scalars, we find through a parameter space scan many points which accurately reproduce the kaon CP -violating parameter ϵK as well as oscillation parameters in K and B(s) mesons. Thus, CP4 offers a novel minimalistic framework for building models with very few assumptions, sufficient predictive power, and rich phenomenology yet to be explored.

Department/s

  • Theoretical Particle Physics

Publishing year

2018-01-01

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2018

Issue

1

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • Beyond Standard Model
  • CP violation
  • Discrete Symmetries
  • Higgs Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479