Impact of a CP-Violating Higgs Sector: From LHC to Baryogenesis

Jing Shu and Yue Zhang
Phys. Rev. Lett. 111, 091801 – Published 27 August 2013

Abstract

We observe a generic connection between LHC Higgs data and electroweak baryogenesis: the particle that contributes to the CP-odd hgg or hγγ vertex would provide the CP-violating source during a first-order phase transition. It is illustrated in the two Higgs doublet model that a common complex phase controls the lightest Higgs properties at the LHC, electric dipole moments, and the CP-violating source for electroweak baryogenesis. We perform a general parametrization of Higgs effective couplings and a global fit to the LHC Higgs data. Current LHC measurements prefer a nonzero phase for tanβ1 and electric dipole moment constraints still allow an order-one phase for tanβ1, which gives sufficient room to generate the correct cosmic baryon asymmetry. We also give some prospects in the direct measurements of CP violation in the Higgs sector at the LHC.

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  • Received 13 April 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.091801

© 2013 American Physical Society

Authors & Affiliations

Jing Shu1 and Yue Zhang2

  • 1State Key Laboratory of Theoretical Physics and Kavli Institute for Theoretical Physics China (KITPC), Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
  • 2California Institute of Technology, Pasadena, California 91125, USA

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Vol. 111, Iss. 9 — 30 August 2013

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