1304.0773 (Jing Shu et al.)

Impact of a CP Violating Higgs: from LHC to Baryogenesis    [PDF]

Jing Shu, Yue Zhang

We observe a generic connection between LHC Higgs data and electroweak baryogenesis: the particle that contributes to CP violating $hgg$ or $h\gamma\gamma$ vertex would provide a CP violating source during first order phase transition. It is illustrated in the 2HDM that a common CP violating 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 CP violating phase for $\tan \beta \lesssim 1$ and EDM constraints still allow an order one phase for $\tan \beta \sim1$, which gives sufficient room for generating the correct cosmic baryon asymmetry. We also give some prospects in the direct measurements of CP violation in the Higgs sector at the LHC.

View original: http://arxiv.org/abs/1304.0773