Supersymmetry Signals of Supercritical String Cosmology at the Large Hadron Collider

Abstract

We investigate the minimal supergravity (mSUGRA) signals at the LHC in the context of supercritical string cosmology (SSC). In this theory, the presence of a time dependent dilaton provides us with a smoothly evolving dark energy and modifies the dark matter allowed region of the mSUGRA model with standard cosmology. Such a dilaton dilutes the supersymmetric dark matter density (of neutralinos) by a factor O(10) and consequently the regions with too much dark matter in the standard scenario are allowed in the SSC. The final states expected at the LHC in this scenario, unlike the standard scenario, consist of Z bosons, Higgs bosons, and/or high energy taus. We show how to characterize these final states and determine the model parameters. Using these parameters, we determine the dark matter content and the neutralino-proton cross section. All these techniques can also be applied to determine model parameters in SSC models with different SUSY breaking scenarios.

26 pages, 21 figures, minor changes and references added

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• Determination of Non-Universal Supergravity Models at the Large Hadron Collider
• Stringy WIMP Detection and Annihilation
• Resolving Histogram Binning Dilemmas with Binless and Binfull Algorithms
• Probing Compressed Mass Spectrum Supersymmetry at the LHC with the Vector Boson Fusion Topology
• Some Aspects of String Cosmology and the LHC