Abstract
The signal of a lighter top squark has been looked at for using Fermilab Tevatron data in the dielectron plus dijet channel. We find that the mass of the lighter top squark when it decays dominantly in the electron plus jet channel can be ruled out up to 220 GeV at 95% C.L. using dielectron data. In the framework of the R-parity breaking supersymmetry (SUSY) model we exclude relevant R-parity violating couplings for a range of top squark masses and other SUSY parameters. The bounds on R-parity violating couplings are very stringent for the parameter space where the lighter top squark turns out to be the next to lightest supersymmetric particle.
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