Abstract
The rates for same-sign and opposite-sign dimuon events with missing energy (indicative of final-state neutrinos) have been measured in 278 GeV π −-Fe and 350 GeV proton-Fe collisions. The main source of opposite-sign events is two semi-leptonic decays of hadronically produced charm states. The same-sign events are consistent with background from pion and kaon decays. We obtain a limit of 0.044 (90% CL) on the fraction of D 0 semileptonic decays that result in the wrong-sign muon and conclude that less than 9% (90% CL) of same-sign dimuon events produced in neutrino interactions can be attributed to D 0- D 0 mixing. The data imply δm < 6.5 × 10 −4 eV and δλ λ < 0.55 for the difference in mass and inverse lifetime of the CP eigenstates of the D 0. Limits on diffractive bottom production cross sections in proton and pion collisions are also presented.
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