Postsphaleron baryogenesis

K. S. Babu, R. N. Mohapatra, S. Nasri

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)


We present a new mechanism for generating the baryon asymmetry of the Universe directly in the decay of a singlet scalar field Sr 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 Sr 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 ηB∼10-10. The simplest realization of this idea which uses a six quark ΔB=2 operator predicts colored scalars accessible to the CERN Large Hadron Collider and neutron-antineutron oscillation within reach of the next-generation experiments.

Original languageEnglish
Article number131301
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 2006
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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