Detection of SUSY in the Stau-Neutralino Coannihilation Region at the LHC

Abstract

We study the feasibility of detecting the stau neutralino (stau_1-neutralino_1)coannihilation region at the LHC using tau leptons. The signal is characterized by multiple low energy tau leptons from neutralino_2-->tau stau_1-->tau tau neutralino_1 decays, where the stau_1 and neutralino_1 mass difference (Delta M) is constrained to be 5-15 GeV by current experimental bounds including the bound on the amount of neutralino cold dark matter. Within the framework of minimal supergravity models, we show that if hadronically decaying tau's can be identified with 50% efficiency for visible pt >20 GeV the observation of such signals is possible in the final state of two tau leptons plus large missing energy and two jets. With a gluino mass of 830 GeV the signal can be observed with as few as 3-10 fb^-1 of data (depending on the size of Delta M). Using a mass measurement of the tau pairs with 10 fb^-1 we can determine dM with a statistical uncertainty of 12% for Delta M = 10 GeV and an additional systematic uncertainty of 14% if the gluino mass has an uncertainty of 5%.

15 pages. 9 Figures, Latex, Typing error in the title as it appeared in the web listing is corrected, paper is unchanged

Cited by in corpus (15)

• Light Neutralino Dark Matter: Direct/Indirect Detection and Collider Searches
• Recoil Detection of the Lightest Neutralino in MSSM Singlet Extensions
• High energy neutrinos from neutralino annihilations in the Sun
• Precision gluino mass at the LHC in SUSY models with decoupled scalars
• Determining the Dark Matter Relic Density in the Minimal Supergravity Stau-Neutralino Coannihilation Region at the Large Hadron Collider
• Probing the parameter space for an MSSM inflation and the neutralino dark matter
• Connecting LHC, ILC, and Quintessence
• SUSY Discovery Potential and Benchmarks for Early Runs at $\sqrt{s}=7$ TeV at the LHC
• Supersymmetry Signals of Supercritical String Cosmology at the Large Hadron Collider
• Using Tau Polarization to probe the Stau Co-annihilation Region of mSUGRA Model at LHC
• Decoding the Mechanism for the Origin of Dark Matter in the Early Universe Using LHC Data
• Discovering the constrained NMSSM with tau leptons at the LHC
• Determination of Non-Universal Supergravity Models at the Large Hadron Collider
• Probing dark matter and CMSSM with same-sign dilepton searches at the LHC
• Third Generation in Cascade Decays