Is leptogenesis falsifiable at LHC?

TL;DR

This paper explores whether leptogenesis, a theory explaining the universe's matter-antimatter imbalance, can be experimentally falsified through collider discoveries like right-handed gauge bosons or Z' particles.

Contribution

It demonstrates that certain collider signals, such as right-handed gauge interactions, can rule out canonical leptogenesis mechanisms, providing a way to test the theory.

Findings

Discovery of right-handed gauge interactions would exclude canonical leptogenesis.

Lower bounds on W_R mass necessary for successful leptogenesis are established.

Observation of a Z' could also falsify leptogenesis models.

Abstract

It is well known that the leptogenesis mechanism offers an attractive possibility to explain the baryon asymmetry of the universe. Its particular robustness however comes with one major difficulty: it will be very hard if not impossible to test experimentally in a foreseeable future, as most of the mechanics typically takes place at high energy or results from suppressed interactions, without unavoidable low-energy implications. An alternate approach is taken by asking: can it be at least falsified? We show that possible discoveries at current and future colliders, most notably that of right-handed gauge interactions, would indeed forbid at least the "canonical" leptogenesis mechanisms, namely those based on right-handed neutrino decay. General lower bounds for successful leptogenesis on the mass of the right-handed gauge boson W_R are given. Other possibilities to falsify leptogenesis, including from the observation of a Z', are also considered.