Analysis of the long-lived slepton next-to-lightest supersymmetric particle in the gauge-mediated supersymmetry breaking model at a linear collider

• Published in: Physical review. D, Particles and fields Vol. 64; no. 1
• Main Authors: Mercadante, Pedro G., Mizukoshi, J. Kenichi, Yamamoto, Hitoshi
• Format: Journal Article
• Language: English
• Published: United States The American Physical Society 01-07-2001
• Subjects: CHARGED PARTICLES; DETECTION; LIFETIME; LINEAR COLLIDERS; MUONS; PARTICLE ACCELERATORS; PARTICLE IDENTIFICATION; SENSITIVITY; SPARTICLES; SUPERSYMMETRY; SYMMETRY BREAKING
• ISSN: 0556-2821; 1089-4918
• DOI: 10.1103/PhysRevD.64.015005

We performed an analysis on the detection of a long-lived slepton at a linear collider with {radical}s=500 GeV. In gauge-mediated symmetry breaking models a long-lived NLSP is predicted for a large value of the supersymmetry breaking scale {radical}F. Furthermore in a large portion of the parameter space this particle is a stau. Such heavy charged particles will leave a track in the tracking volume and hit the muonic detector. In order to disentangle this signal from the muon background, we explore the kinematics and particle identification tools: a time-of-flight device, dE/dX, and Cherenkov devices. We show that a linear collider will be able to detect long-lived staus with masses up to the kinematical limit of the machine. We also present our estimation of the sensitivity to the stau lifetime.