Baryogenesis via mesino oscillations

Abstract

We propose a new mechanism for baryogenesis at the 1-200 MeV scale. Enhancement of CP violation takes place via interference between oscillations and decays of mesinos-bound states of a scalar quark and antiquark and their CP conjugates. We present the mechanism in a simplified model with four new fundamental particles, with masses between 300 GeV and 10 TeV, and show that some of the experimentally allowed parameter space can give the observed baryon-to-entropy

Baryogenesis from B meson oscillations

“…In the present work, we reexamine the simpler model of ref. [4], and show that for a different parameter range that was not considered in the previous work, baryon number violating decays of B 0 mesons are allowed by experiment, potentially observable, and could be the explanation for baryogenesis.…”

“…In the present work, we reexamine the simpler model of ref. [4], and show that for a different parameter range that was not considered in the previous work, baryon number violating decays of B 0 mesons are allowed by experiment, potentially observable, and could be the explanation for baryogenesis.The baryogenesis scenario described here begins in the pre-nucleosynthesis early universe with the decays of a long lived scalar into b−quarks and anti-quarks. These * Electronic address: anelson@phys.washington.edu † Electronic address: huangyu@uw.edu…”

“…CP violation also occurs, however the standard model CP violation appears to be too small to explain the observed baryon asymmetry. Finally, the minimal Standard Model contains no mechanism for departure from thermal equilibrium.Recent work [3,4] has shown the possibility for low energy baryogenesis via the oscillations of neutral hadrons, in conjunction with new sources of CP and baryon number violation. In ref.[4], the oscillating hadrons were mesinos-bound states of a quark and an anti-squark.…”

“…Our model is similar to the one used in ref. [5] to produce the baryon asymmetry through oscillations of baryons [3,4], although even simpler. It is worth noting that even though we use a similar model, the parameter space is different and we are less constrained from dinucleon decay.…”

Baryogenesis via particle-antiparticle oscillations

“…We include interactions, specifically elastic scatterings with light particles and an- 3 For studies of quantum decoherence effects in flavor oscillations in resonant leptogenesis, see, e.g., [21][22][23][24] 4 As a way to evade all quantum decoherence effects, the authors of Ref. [27] used heavy particles that decay out-of-equilibrium at very low temperatures to mesinos. In that case there are no other processes that compete with oscillations and mesino-antimesino oscillations enhances CP violation.…”