2005/12/31 by Toshifumi Jittoh, Joe Sato, Takashi Shimomura +1
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.73.055009
published as Phys.Rev.D73:055009,2006 · 15 pages, 5 figures
openalex publication_date 2006/03/17 · arxiv created 2006/05/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the stau lifetime in a scenario with the LSP taken to be a neutralino and the NLSP being a stau, based on the minimal supersymmetric Standard Model. The mass difference between the LSP and NLSP, \ensuremathδm, must satisfy \ensuremathδm/m_\stackrel\texttildelow\ensuremathχ\ensuremath∼ a few % or less for coannihilation to occur, where m_\stackrel\texttildelow\ensuremathχ is the neutralino mass. We calculate the stau lifetime from the decay modes \stackrel\texttildelow\ensuremathτ\ensuremath→\stackrel\texttildelow\ensuremathχ\ensuremathτ, \stackrel\texttildelow\ensuremathχ\ensuremathν_\ensuremathτ\ensuremathπ, and \stackrel\texttildelow\ensuremathχ\ensuremathν_\ensuremathτ\ensuremathμ(e)\ensuremathν_\ensuremathμ(e) and discuss its dependence on various parameters. We find that the lifetime is in the range 10^\ensuremath-22--1016 sec for 10^\ensuremath-2\ensuremath≤\ensuremathδm\ensuremath≤10 GeV. We also discuss the connection with lepton flavor violation if there is mixing between sleptons.