The long-lived stau as a thermal relic

2009/09/18 by Josef Pradler, Pradler, Josef
Biochemistry, Genetics and Molecular Biology · Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #Geomagnetism and Paleomagnetism Studies #Geophysics and Gravity Measurements #High Energy Physics - Phenomenology (hep-ph)

paper · pdf · doi:10.48550/arxiv.0909.3429

openalex publication_date 2009/09/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We consider physics beyond the Standard Model in which a long-lived electromagnetically charged massive particle species (CHAMP) appears. We discuss the unique sensitivity the early Universe exhibits on the mere presence and on the decay of such a particle. A CHAMP can be realized in supersymmetric extensions of the Standard Model. We carry out a detailed study of gravitino dark matter scenarios in which the lighter stau is the lightest Standard Model superpartner and thus the CHAMP. Particularly stringent constraints on the gravitino-stau scenario arise from the thermal catalysis of primordial nucleosynthesis reactions. This motivates a thorough investigation of the thermal freeze-out process of the long-lived stau. There, we show that even the most stringent cosmological constraints can potentially be evaded.

Citations

• Motivations for and Implications of Non-Universal GUT-Scale Boundary Conditions for Soft SUSY-Breaking Parameters
• Cosmic abundances of stable particles: Improved analysis
• Supersymmetry and Supergravity
• The beryllium abundance in the very metal-poor halo star G 64-12 from\n VLT/UVES observations
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• Classical Electrodynamics

Related

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• LHC signature with long-lived stau in high reheating temperature scenario
• Charged long-lived particles in the GMSB scenario at the Future Circular Collider (FCC-ee)
• Big-bang nucleosynthesis with a long-lived CHAMP including He4 spallation process
• Cosmological Stasis from a Single Annihilating Particle Species: Extending Stasis Into the Thermal Domain