A new mechanism for baryogenesis living through electroweak era

We present a new mechanism for baryogenesis by introducing a heavy vector-like SU(2)W singlet quark(s) with Qem=23 quark U or Qem=−13 quark D. The lifetime of the heavy quark is assumed to be in the range 2×10−11s<τ<1s. Being SU(2)W singlet, it survives the electroweak phase transition era. It mixes with SU(2)W doublet quarks with tiny mixing angles to satisfy the FCNC constraints, where a simple Z2 symmetry is suggested for realizing this scheme. The heavy quark asymmetry is generated in analogy with the old GUT scenario.