Top-quark decay via R-parity violating interactions at the Tevatron

Abstract

We consider the top-quark decay $t\to \tilde{\ddot{I}}„b$ and $t\to \ddot{I}„b\tilde{\ddot{I}}{‡}_1^0$ via explicit R-parity violating interactions in SUSY theories. We discuss the observability of those channels at the Fermilab Tevatron collider. The existing Tevatron data indicate a 95% confidence level upper bound on the coupling to be less than 0.94(0.63) for a long-lived (short-lived) $\tilde{\ddot{I}}{‡}_1^0$ with $m_{\tilde{\ddot{I}}„}=70$ GeV. At Tevatron Run II with an integrated luminosity of 2 (10) fb${}^{-1}$, one can obtain a 2$\ddot{I}ƒ$ constraint as 0.38 (0.24) for a long-lived $\tilde{\ddot{I}}{‡}_1^0$ and 0.29(0.19) for a short-lived $\tilde{\ddot{I}}{‡}_1^0$, beyond the current indirect limit.

16 pages, 7 eps figures. Using LaTeX with axodraw. LSP decay mode included; more refs.; to appear in PLB