2024/03/27 by Howard Baer, Baer, Howard, V. Barger +3 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2403.18991
openalex publication_date 2024/03/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Natural supersymmetry (SUSY) with light higgsinos is perhaps the most plausible of all weak scale SUSY models while a variety of motivations point to (right) tau sleptons as the lightest of all the sleptons. We examine a SUSY model line with rather light right-staus embedded within natural SUSY. For light stau1 of a few hundred GeV, then the decays stau1 -> τ\tchi1,20 and ντ\tchi1- occur at comparable rates where the (higgsino-like) \tchi1^± and \tchi20 release only small visible energy: in this case, the expected τ+τ- +\eslt signature is diminished from usual expectations due to the presence of the nearly invisible decay mode \ttau1 -> ντ\tchi1-. However, once m\ttau1> ~m(bino), then decays to binos such as \ttau1 -> τ\tchi30 open up where \tchi30 decays to higgsinos plus W^±, Z0 and h at comparable rates. For these heavier staus, then stau pair production gives rise to diboson+\eslt events which may contain 0, 1 or 2 additional hard τleptons. From these considerations, we examine the potential for future discovery of tau-slepton pair production at high-luminosity LHC. While we do not find a 5σHL-LHC discovery reach for 3000 fb-1, we do find a 95% CL exclusion reach, ranging between m\ttau1:100-450 GeV for m\tchi10~ 100 GeV. This latter reach disappears for m\tchi10>~ 200 GeV.