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Related Experiment Video

Updated: Apr 27, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Falsifying high-scale leptogenesis at the LHC.

Frank F Deppisch¹, Julia Harz¹, Martin Hirsch²

¹Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom.

Physical Review Letters

|June 21, 2014

Summary

This summary is machine-generated.

Detecting lepton number violating (LNV) processes would falsify high-scale leptogenesis (LG) models by violating out-of-equilibrium conditions. However, non-observation of LNV processes does not rule out all LG models.

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Area of Science:

Particle Physics
Cosmology
Astroparticle Physics

Background:

The observed baryon asymmetry in the Universe is a key cosmological puzzle.
Lepton number violating (LNV) processes are crucial for baryogenesis models.
High-scale leptogenesis (LG) models propose mechanisms for generating this asymmetry.

Purpose of the Study:

To investigate the implications of observing LNV processes for high-scale LG models.
To determine the constraints imposed by LNV processes on early Universe cosmology.
To analyze the impact of LNV on the washout factor and equilibrium conditions.

Main Methods:

Theoretical analysis of LNV processes and their connection to baryon asymmetry.
Examination of leptogenesis models with heavy right-handed neutrinos.
Assessment of the out-of-equilibrium condition in the early Universe.

Main Results:

A nonzero cross section for LNV processes would strongly constrain washout factors.
This would violate the out-of-equilibrium condition in high-scale LG models.
Observation of LNV processes would falsify high-scale LG models.

Conclusions:

The detection of LNV processes at the LHC would rule out specific high-scale leptogenesis scenarios.
Non-observation of LNV processes does not exclude the viability of all leptogenesis models.
Constraints on early Universe physics are derived from LNV process measurements.