Neutron EDM in Four Generation Standard Model
نویسندگان
چکیده
A fourth generation of quarks may provide sufficient CP violation for the baryon asymmetry of the Universe. We estimate the neutron electric dipole moment in the presence of the fourth generation, and find it would be dominated by the strange quark chromoelectric dipole moment, assuming it does not get wiped out by a Peccei-Quinn symmetry. With three loop analytical expression, 500 GeV heavy quark mass, and a Jarlskog CPV factor which is consistent well with LHC 2011 summer data, the neutron EDM is found around 10 −31 e cm, still far below the 10 −28 e cm reach of next generation of experiments.
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