LHC Signatures of WIMP-triggered Baryogenesis

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.

13 pages, 3 figures. Version accepted for publication in PRD. The 750 GeV benchmark point was removed and replaced with more general benchmark points. All other signals remain unchanged but with some more discussions added in response to more recent results from the LHC

References in corpus (7)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Parton distributions in the LHC era: MMHT 2014 PDFs
• Emerging Jets
• Search for pair-produced resonances decaying to jet pairs in proton-proton collisions at sqrt(s) = 8 TeV
• Probing Baryogenesis with Displaced Vertices at the LHC
• The Fate of Long-Lived Superparticles with Hadronic Decays after LHC Run 1
• Axino LSP Baryogenesis and Dark Matter

Cited by in corpus (8)

• Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case
• Probing Leptogenesis with the Cosmological Collider
• A flavoured dark sector
• Interpreting the 750 GeV digamma excess: a review
• WIMP Cogenesis for Asymmetric Dark Matter and the Baryon Asymmetry
• Dark Freeze-out Cogenesis
• LHC phenomenology and baryogenesis in supersymmetric models with a $U(1{)}_R$ baryon number
• Baryon asymmetry generation in the E6CHM