Complex Vacuum and Lightness of Higgs Boson

Understand

The CP violation observed in K- and B-mesons can be successfully accommodated via the CKM matrix in the standard model.

• However the additional CP violation is required in order to induce the matter and anti-matter asymmetry observed in the Universe.
• The additional CP violation can be induced by complex vacuum, namely the spontaneous CP violation.
• In this paper we reveal the intimate connection of the spontaneous CP violation and the lightness of the Higgs boson, which was recently discovered by ATLAS and CMS at the LHC.