Post--Sphaleron Baryogenesis

Abstract

We present a new mechanism for generating the baryon asymmetry of the universe directly in the decay of a singlet scalar field $S_r$ with a weak scale mass and a high dimensional baryon number violating coupling. Unlike most currently popular models, this mechanism, which becomes effective after the electroweak phase transition, does not rely on the sphalerons for inducing a nonzero baryon number. CP asymmetry in $S_r$ decay arises through loop diagrams involving the exchange of $W^{\pm }$ gauge bosons, and is suppressed by light quark masses, leading naturally to a value of ${\eta }_B\sim 10^{-10}$. We show that the simplest realization of this mechanism, which uses a six quark $\Delta B=2$ operator, predicts colored scalars accessible to the LHC, and neutron--antineutron oscillation within reach of the next generation experiments.

13 pages, 4 figures, typos corrected, references and acknowledgment added

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