A New Mechanism For Baryogenesis Living Through Electroweak Era
High Energy Physics - Phenomenology
2009-11-10 v2 Astrophysics
Abstract
We present a new mechanism for baryogenesis by introducing a heavy vector-like SU(2)_W singlet quark(s) with Q_{em}=2/3 quark U or Q_{em}=-1/3 quark D. The lifetime of the heavy quark is assumed to be in the range 2 \times 10^{-11}s < t < 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 Z_2 symmetry is suggested for realizing this scheme. The heavy quark asymmetry is generated in analogy with the old GUT scenario.
Cite
@article{arxiv.hep-ph/0409001,
title = {A New Mechanism For Baryogenesis Living Through Electroweak Era},
author = {Hyung Do Kim and Jihn E. Kim and Takuya Morozumi},
journal= {arXiv preprint arXiv:hep-ph/0409001},
year = {2009}
}
Comments
10 pages, typos corrected, the washout rate by sphaleron corrected and new bound from the decay using 4 fermi interaction added