A study of the centrally produced + 0 channel in pp interactions at 450 GeV/c The WA102 Collaboration

The reaction pp! pf ( + 0 )ps has been studied at 450 GeV/c in an experiment designed to search for gluonic states. A spin analysis has been performed and the dPT lter applied. The analysis conrms the previous observation that all undisputed qq states are suppressed at small dPT . In addition, a clear dierence is observed in the production mechanism for the and !.