Gravitino LSP and leptogenesis after the first LHC results

Journal Article · Tue Apr 01 04:00:00 EDT 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/04/023· OSTI ID:22373639

Heisig, Jan ^[1]

---

1. Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University, Sommerfeldstr. 14, 52056 Aachen (Germany)

Supersymmetric scenarios where the lightest superparticle (LSP) is the gravitino are an attractive alternative to the widely studied case of a neutralino LSP. A strong motivation for a gravitino LSP arises from the possibility of achieving higher reheating temperatures and thus potentially allow for thermal leptogenesis. The predictions for the primordial abundances of light elements in the presence of a late decaying next-to-LSP (NSLP) as well as the currently measured dark matter abundance allow us to probe the cosmological viability of such a scenario. Here we consider a gravitino-stau scenario. Utilizing a pMSSM scan we work out the implications of the 7 and 8 TeV LHC results as well as other experimental and theoretical constraints on the highest reheating temperatures that are cosmologically allowed. Our analysis shows that points with T{sub R}∼>10{sup 9} GeV survive only in a very particular corner of the SUSY parameter space. Those spectra feature a distinct signature at colliders that could be looked at in the upcoming LHC run.

• OSTI ID: 22373639
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 04 Vol. 2014; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
ABUNDANCE
CERN LHC
FORECASTING
MATHEMATICAL SPACE
NONLUMINOUS MATTER
PARTICLE DECAY
PARTICLE PRODUCTION
PROBES
SPECTRA
SUPERSYMMETRY
TEV RANGE 01-10