Baryogenesis by B - L generation due to superheavy particle decay

TL;DR

This paper proposes a mechanism for baryogenesis via B-L generation from the decay of superheavy particles, which can account for the universe's baryon asymmetry without conflicting with nucleon stability constraints.

Contribution

It introduces a novel baryogenesis scenario involving superheavy particle decay with dimension-7 B-L violating operators, differing from traditional leptogenesis models.

Findings

Superheavy fields heavier than 10^{13-14} GeV can generate sufficient baryon asymmetry.

The B-L violating operators have dimension 7, allowing compatibility with nucleon stability.

The mechanism explains the observed baryon asymmetry without conflicting with existing constraints.

Abstract

We have shown that the $B-L$ generation due to the decay of the thermally produced superheavy fields can explain the Baryon assymmetry in the universe if the superheavy fields are heavier than $10^{13-14}$ GeV. Note that although the superheavy fields have non-vanishing charges under the standard model gauge interactions, the thermally prduced baryon asymmetry is sizable. The $B-L$ violating effective operators induced by integrating the superheavy fields have dimension 7, while the operator in the famous leptogenesis has dimension 5. Therefore, the constraints from the nucleon stability can be easily satisfied.