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Long life stau in the minimal supersymmetric standard model

Toshifumi Jittoh·Joe Sato·Takashi Shimomura·Masato Yamanaka
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Abstract

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, $δm$, must satisfy $δm/m_{\tildeχ} \sim$ a few % or less for coannihilation to occur, where $m_{\tildeχ}$ is the neutralino mass. We calculate the stau lifetime from the decay modes $\tildeτ\to \tildeχτ$, $\tildeχν_τπ$, and $\tildeχν_τμ(e)ν_{μ(e)}$ and discuss its dependence on various parameters. We find that the lifetime is in the range $10^{-22}$--$10^{16}$ sec for $10^{-2} \le δm \le 10$ GeV. We also discuss the connection with lepton flavor violation if there is mixing between sleptons.

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Toshifumi Jittoh, Joe Sato, Takashi Shimomura, Masato Yamanaka. 2006-05-11. Long life stau in the minimal supersymmetric standard model. https://doi.org/10.1103/physrevd.73.055009

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