Gravitino LSP and leptogenesis after the first LHC results

Abstract

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_R>10^9 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.

19 pages + references, 9 eps figures; v2: analysis improved, figures 2-5 updated, conclusions unchanged, presentation improved, references added, matches journal version

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Cited by in corpus (21)

• Dark matter production in the early Universe: beyond the thermal WIMP paradigm
• Physics at the e+ e- Linear Collider
• The Case for an EeV Gravitino
• Probing Leptogenesis
• Constraining new physics with searches for long-lived particles: Implementation into SModelS
• Spectator Effects during Leptogenesis in the Strong Washout Regime
• Constraints on the reheating temperature from sizable tensor modes
• Neutralino and gravitino dark matter with low reheating temperature
• Super-Natural MSSM
• SUSY-QCD corrected and Sommerfeld enhanced stau annihilation into heavy quarks with scheme and scale uncertainties
• LHC constraints on Gravitino Dark Matter
• Long-Lived stop at the LHC with or without R-parity
• Gravitino thermal production revisited and a new cosmological scenario of gauge mediation
• Natural SUSY at LHC with Right-Sneutrino LSP
• Gravitino Dark Matter in Split Supersymmetry with Bilinear R-Parity Violation
• Revisiting gravitino dark matter in thermal leptogenesis
• Suppressing gravitino thermal production with a temperature-dependent messenger coupling
• Stop Decay with LSP Gravitino in the final state: ${\tilde{t}}_1\to \tilde{G}Wb$
• Naturalness in Soft Leptogenesis and Gravitino Mass Bound due to Primordial Black Holes
• Helicity Amplitudes for production of massive gravitino/goldstino
• Very long-lived Stop NLSP in MSSM scenarios with Gravitino LSP