Studies of proton-proton collisions at the CERN ISR with an identified charged hadron of high transverse momentum at 90°

Abstract Results are reported from an investigation of proton-proton collisions at a c.m. energy of 52.6 GeV, in which a charged hadron with large transverse momentum is produced near 90° in the c.m.s. We have studied the momentum and charge correlations between identified high- p T trigger particles and other charged particles in the central region (rapidity | y | p T particles with charge opposite to that of the trigger particle in a small solid angle around the trigger particle. The sum of the momenta of charged particles inside | y | c per GeV/ c increase of the trigger momentum. Opposite in azimuth to the trigger particle we observe close pairs of high- p T particles in both neutral and doubly charged combinations. In this region we see an indication of scaling in the x E variable for trigger momenta exceeding 3 GeV/ c . The distribution of charge is strongly correlated with the charge of the trigger particle. Otherwise the type of trigger particle does not affect strongly the observed event structure, but for trigger momenta above 3 GeV/ c , K − and p triggers are observed to have fewer negative high- p T recoil particles within | y |