Determining the Dark Matter Relic Density in the Minimal Supergravity Stau-Neutralino Coannihilation Region at the Large Hadron Collider

TL;DR

This paper demonstrates that measurements at the LHC within the minimal supergravity model can predict the dark matter relic density with high precision, matching cosmic measurements, by analyzing stau-neutralino coannihilation.

Contribution

It introduces a method to determine the dark matter relic density from LHC data without needing direct squark mass measurements, focusing on the CA region in mSUGRA.

Findings

Predicted dark matter relic density with 6% uncertainty.

Measured mSUGRA parameters without direct squark mass measurements.

Provided mass measurements of gauginos, squarks, and staus in the CA region.

Abstract

We examine the stau-neutralino coannihilation (CA) mechanism of the early universe. We use the minimal supergravity (mSUGRA) model and show that from measurements at the Large Hadron Collider one can predict the dark matter relic density with an uncertainty of 6% with 30 fb-1 of data, which is comparable to the direct measurement by Wilkinson Microwave Anisotropy Probe. This is done by measuring four mSUGRA parameters m0, m1/2, A0 and tan(beta) without requiring direct measurements of the top squark and bottom squark masses. We also provide precision measurements of the gaugino, squark, and lighter stau masses in this CA region without assuming gaugino universality.