Collider and Dark Matter Searches in Models with Mixed Modulus-Anomaly Mediated SUSY Breaking

Abstract

We investigate the phenomenology of supersymmetric models where moduli fields and the Weyl anomaly make comparable contributions to SUSY breaking effects in the observable sector of fields. This mixed modulus-anomaly mediated supersymmetry breaking (MM-AMSB) scenario is inspired by models of string compactification with fluxes, which have been shown to yield a de Sitter vacuum (as in the recent construction by Kachru {\it et al}). The phenomenology depends on the so-called modular weights which, in turn, depend on the location of various fields in the extra dimensions. We find that the model with zero modular weights gives mass spectra characterized by very light top squarks and/or tau sleptons, or where M_1\sim -M_2 so that the bino and wino are approximately degenerate. The top squark mass can be in the range required by successful electroweak baryogenesis. The measured relic density of cold dark matter can be obtained via top squark co-annihilation at low \tanβ, tau slepton co-annihilation at large \tanβor via bino-wino coannihilation. Then, we typically find low rates for direct and indirect detection of neutralino dark matter. However, essentially all the WMAP-allowed parameter space can be probed by experiments at the CERN LHC, while significant portions may also be explored at an e^+e^- collider with \sqrt{s}=0.5--1 TeV. We also investigate a case with non-zero modular weights. In this case, co-annihilation, A-funnel annihilation and bulk annihilation of neutralinos are all allowed. Results for future colliders are qualitatively similar, but prospects for indirect dark matter searches via gamma rays and anti-particles are somewhat better.

38 pages including 22 EPS figures; latest version posted to conform with published version

References in corpus (2)

• Supersymmetry, Naturalness, and Signatures at the LHC
• The Role of Antimatter Searches in the Hunt for Supersymmetric Dark Matter

Cited by in corpus (18)

• The minimal model of fermionic dark matter
• Explaining the Electroweak Scale and Stabilizing Moduli in M Theory
• Compressed supersymmetry and natural neutralino dark matter from top squark-mediated annihilation to top quarks
• An M theory Solution to the Hierarchy Problem
• Varying the Universality of Supersymmetry-Breaking Contributions to MSSM Higgs Boson Masses
• More about F-term uplifting
• Diphoton decays of stoponium at the Large Hadron Collider
• Deflected Mirage Mediation: A Framework for Generalized Supersymmetry Breaking
• Mirage Pattern from the Heterotic String
• Exploring compressed supersymmetry with same-sign top quarks at the Large Hadron Collider
• Discovery of supersymmetry with degenerated mass spectrum
• The top squark-mediated annihilation scenario and direct detection of dark matter in compressed supersymmetry
• Axionic Mirage Mediation
• Nonthermal dark matter in mirage mediation
• Unravelling Strings at the LHC
• Baryon Asymmetry in a Heavy Moduli Scenario
• Gaugino Condensation with a Doubly Suppressed Gravitino Mass
• Low-scale Gaugino Mass Unification