1.
Phys Rev Lett
; 113(18): 181601, 2014 Oct 31.
Artigo
em Inglês
| MEDLINE
| ID: mdl-25396359
RESUMO
An extensively studied mechanism to create particle-antiparticle asymmetries is the out-of-equilibrium and CP violating decay of a heavy particle. We, instead, examine how asymmetries can arise purely from 2â2 annihilations rather than from the usual 1â2 decays and inverse decays. We review the general conditions on the reaction rates that arise from S-matrix unitarity and CPT invariance, and show how these are implemented in the context of a simple toy model. We formulate the Boltzmann equations for this model, and present an example solution.