Year: 2016
Type: article
Abstract: $CP$ violation, which is crucial for producing the baryon asymmetry of the Universe, is enhanced in particle-antiparticle oscillations. We study particle-antiparticle oscillations [of a particle with mass $O(100\text{ }\text{ }\mathrm{GeV})$] with $CP$ violation in the early Universe in the presence of interactions with $O(\mathrm{ab}\text{\ensuremath{-}}\mathrm{fb})$ cross sections. We show that if baryon-number-violating interactions exist, a baryon asymmetry can be produced via out-of-equilibrium decays of oscillating particles. As a concrete example we study a $U(1{)}_{R}$-symmetric, $R$-parity-violating supersymmetry model with pseudo-Dirac gauginos, which undergo particle-antiparticle oscillations. Taking bino to be the lightest $U(1{)}_{R}$-symmetric particle, and assuming it decays via baryon-number-violating interactions, we show that bino-antibino oscillations can produce the baryon asymmetry of the Universe.
Authors: Seyda Ipek, John March-Russell
Institution: Fermi National Accelerator Laboratory
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: U.S. Department of Energy
OpenAlex ID: W2339893909