title: Postsphaleron 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+/- gauge bosons and is suppressed by light quark masses, leading naturally to a value of eta(B) approximately 10(-10). The simplest realization of this idea which uses a six quark DeltaB=2 operator predicts colored scalars accessible to the CERN Large Hadron Collider and neutron-antineutron oscillation within reach of the next-generation experiments.
authors.affiliation: Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA.
authors.forename: K S
authors.initials: KS
authors.lastname: Babu
authors.forename: R N
authors.initials: RN
authors.lastname: Mohapatra
authors.forename: S
authors.initials: S
authors.lastname: Nasri