Gravitino Dark Matter Scenarios with Massive Metastable Charged Sparticles at the LHC

Details Gravitino Dark Matter Scenarios with Massive Metastable Charged Sparticles at the LHC Gravitino Dark Matter Scenarios with Massive Metastable Charged Sparticles at the LHC

2006-07-24

arxiv.org/abs/hep-ph/0607261v2

JHEP 0610:061,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 10 figures, updated to version published in JHEP

Scientific paper

10.1088/1126-6708/2006/10/061

We investigate the measurement of supersymmetric particle masses at the LHC in gravitino dark matter (GDM) scenarios where the next-to-lightest supersymmetric partner (NLSP) is the lighter scalar tau, or stau, and is stable on the scale of a detector. Such a massive metastable charged sparticle would have distinctive Time-of-Flight (ToF) and energy-loss ($dE/dx$) signatures. We summarise the documented accuracies expected to be achievable with the ATLAS detector in measurements of the stau mass and its momentum at the LHC. We then use a fast simulation of an LHC detector to demonstrate techniques for reconstructing the cascade decays of supersymmetric particles in GDM scenarios, using a parameterisation of the detector response to staus, taus and jets based on full simulation results. Supersymmetric pair-production events are selected with high redundancy and efficiency, and many valuable measurements can be made starting from stau tracks in the detector. We recalibrate the momenta of taus using transverse-momentum balance, and use kinematic cuts to select combinations of staus, taus, jets and leptons that exhibit peaks in invariant masses that correspond to various heavier sparticle species, with errors often comparable with the jet energy scale uncertainty.

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