New limits on D0 (1.865) production in proton-nucleus collisions at 400 GeV/c

Abstract

We present final results of a sensitive search for new particles in 7r-+K ~ effective mass spectra observed in protonnucleus collisions at 400 GeV/c. We establish a limit for D°(1.865) production Be+ n-do/dy< 360 nb/nucleon at Ycm ~-0.4. For B ° ~ 7r-K ÷ the limit is 290 nb/nucleon.