Probing baryon asymmetry of the Universe at LHC and SHiP

Abstract

The origin of the baryon asymmetry of the Universe (BAU) is one of the major puzzles beyond the Standard Model. Detecting the particles responsible for the generation of the BAU would enormously boost our understanding of physics of the early Universe. Here we demonstrate that searches for displaced vertices at ATLAS, CMS and LHCb allow detecting heavy neutral leptons (HNL) with parameters that can simultaneously lead to the successful generation of the BAU and explain the masses and oscillations of active neutrinos. The combination of a dedicated LHC search program and a complementary Intensity Frontier experiment (such as SHiP) will allow exploring a sizeable part of the "minimal HNL baryogenesis" parameter space.

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• Displaced Vertex signatures of a pseudo-Goldstone sterile neutrino
• Reconciling resonant leptogenesis and baryogenesis via neutrino oscillations
• Testability of leptogenesis with three RH-neutrinos below the electroweak scale