LHC Signatures of WIMP-triggered Baryogenesis

TL;DR

This paper explores how WIMP-triggered baryogenesis can produce detectable collider signatures at the LHC, including diphoton resonances, multi-quark events, and exotic jets, offering new ways to test dark matter and baryon asymmetry theories.

Contribution

It demonstrates that WIMP-triggered baryogenesis models can be tested at the LHC through distinctive signatures even without WIMPs interacting via SM gauge or Higgs portals.

Findings

Diphoton resonance signals within current LHC reach.

Multi-top and multi-bottom quark production signatures.

Potential for di-nucleon decay as a probe.

Abstract

A robust mechanism was recently proposed in which thermal freeze-out of WIMPs can provide a unified origin of dark matter and baryon abundances in our universe. We point out that this WIMP-triggered baryogenesis mechanism can exhibit a rich collider phenomenology and be tested at the current and near-future experiments at LHC, even in the case where the WIMPs are completely devoid of SM gauge and higgs portal interactions, as may be motivated by the persistent null results of WIMP dark matter searches. We catalogue a rich array of LHC signatures robustly present in such a scenario. In particular, the simplest such implementation can already offer a very clean signal of a TeV-scale resonance that decays to diphotons with a cross section that can easily be within the reach of the current and near-future LHC runs in the region of parameter space that leads to a successful baryogenesis. Other characteristic signatures include the production of multi-bottom and/or multi-top quarks, promptly or displaced. An even more exotic possibility is the production of two separate sets of isolated emerging jets connected by a charged track, which may require new dedicated studies. Finally, di-nucleon decay can also provide a powerful probe of the mechanism.