Search for the lightest scalar top quark in events with two leptons in pp¯ collisions at s=1.96 TeV

Data collected by the D0 detector at a pp¯ center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider have been used to search for pair production of the lightest supersymmetric partner of the top quark decaying into bℓν˜. The search is performed in the ℓℓ′=eμ and μμ final states. No evidence for this process has been found in data samples of approximately 400 pb−1. The domain in the [M(t˜1),M(ν˜)] plane excluded at the 95% C.L. is substantially extended by this search.