Displaced vertex signals of low temperature baryogenesis

TL;DR

This paper investigates low-temperature baryogenesis involving long-lived particles, proposing signals like displaced vertices at the LHC, and emphasizes the importance of far detector experiments for discovering new physics.

Contribution

It introduces a model with SM singlets that generates baryon asymmetry through long-lived fermion decays, predicting observable displaced vertex signals at the HL-LHC.

Findings

Displaced vertex signals can be effectively probed at the HL-LHC.

Far detector experiments like MATHUSLA enhance discovery potential.

The model avoids strong flavor physics bounds while predicting rich diquark phenomenology.

Abstract

We explore the connection of baryogenesis at temperatures below the electroweak scale and signals for long-lived particles at the LHC. The model features new SM singlets, with a long-lived fermion decaying to quarks to generate the baryon asymmetry. The model avoids strong flavor physics bounds while predicting a rich diquark phenomenology, monojet signals, and displaced vertices. We show how the displaced vertex signals can be probed at the HL-LHC. The large transverse production makes a strong physics case for constructing far detector experiments such as MATHUSLA, ANUBIS, and CODEX-b, complementary to the central and forward long-lived particle program.