A simple testable model of baryon number violation: Baryogenesis, dark matter, neutron–antineutron oscillation and collider signals

Rouzbeh Allahverdi,P.S Bhupal Dev,Bhaskar Dutta

doi:10.1016/j.physletb.2018.02.019

Rouzbeh Allahverdi, P.S Bhupal Dev + Show 1 more

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https://doi.org/10.1016/j.physletb.2018.02.019

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Abstract

We study a simple TeV-scale model of baryon number violation which explains the observed proximity of the dark matter and baryon abundances. The model has constraints arising from both low and high-energy processes, and in particular, predicts a sizable rate for the neutron–antineutron (n−n¯) oscillation at low energy and the monojet signal at the LHC. We find an interesting complementarity among the constraints arising from the observed baryon asymmetry, ratio of dark matter and baryon abundances, n−n¯ oscillation lifetime and the LHC monojet signal. There are regions in the parameter space where the n−n¯ oscillation lifetime is found to be more constraining than the LHC constraints, which illustrates the importance of the next-generation n−n¯ oscillation experiments.

Highlights

Baryon number (B), an accidental global symmetry of the Standard Model (SM) Lagrangian, must be broken to dynamically generate the observed baryon asymmetry of the universe [1]
We find an interesting complementarity among the constraints arising from the observed baryon asymmetry, ratio of dark matter and baryon abundances, n − noscillation lifetime and the LHC monojet signal
This makes it plausible to envisage a TeV-scale model of ∆B = 2 that can be tested in laboratory experiments, while simultaneously solving the cosmological puzzle of baryogenesis, and possibly as a bonus, the apparent coincidence of baryon and dark matter (DM) abundances

Summary

A Simple Testable Model of Baryon Number Violation

S. Bhupal Dev, and Bhaskar Dutta3 1Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USA. We study a simple TeV-scale model of baryon number violation which explains the observed proximity of the dark matter and baryon abundances. The model has constraints arising from both low and high-energy processes, and in particular, predicts a sizable rate for the neutronantineutron (n − n) oscillation at low energy and the monojet signal at the LHC. We find an interesting complementarity among the constraints arising from the observed baryon asymmetry, ratio of dark matter and baryon abundances, n − noscillation lifetime and the LHC monojet signal. There are regions in the parameter space where the n − noscillation lifetime is found to be more constraining than the LHC constraints, which illustrates the importance of the next-generation n−noscillation experiments

INTRODUCTION

THE MODEL

COMMON ORIGIN OF DARK MATTER AND BARYON ABUNDANCE

NEUTRON-ANTINEUTRON OSCILLATION

COLLIDER SIGNALS

CONCLUSION