Probing top quark decay into light stop in the supersymmetric standard model at the upgraded Tevatron

Abstract

We investigate the possibility of observing the exotic decay mode of the top quark into the lightest stop (${\tilde{t}}_1$) and neutralino (${\tilde{\chi }}_1^0$) in the minimal supersymmetric standard model with R-parity at the upgraded Tevatron. First we determine the allowed range for the branching fraction $B(t\to {\tilde{t}}_1{\tilde{\chi }}_1^0)$ in the region of parameter space allowed by the $R_b$ data and the CDF $ee\gamma \gamma +/E_T$ event, and then consider all possible backgrounds and investigate the possibility of observing this final state at the Tevatron. We find that this final state is unobservable at Run 1. However, Run 2 can provide significant information on this new decay mode of the top quark: either discover it, or establish a strong constraint on the masses of ${\tilde{t}}_1$ and ${\tilde{\chi }}_1^0$ given approximately by $M_{{\tilde{\chi }}_1^0}>M_{{\tilde{t}}_1}-6$ GeV.

12 pages, LATEX, 2 PS figures

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• Probing new physics from top quark FCNC processes at linear colliders : a mini review
• Single top production at the LHC as a probe of R parity violation
• The FCNC top-squark decay as a probe of squark mixing
• Supersymmetric effects in top quark decay into polarized W-boson
• Top-Quark Phenomenology in Models with Bilinearly and Spontaneously Broken R-parity
• Probing R-parity Violating Interactions from Top Quark Polarization at LHC
• Top quark three-body decays in the R-parity violating MSSM
• Search for the Supersymmetric Partner of the Top-Quark in $p\bar{p}$ Collisions at $\sqrt{s}=1.8\mathrm{TeV}$
• Searching for a stop-pair sample from top counting experiments at hadron colliders
• Techniques for the Top Squark Search at the Fermilab Tevatron