STUDIES OF PROTON PROTON COLLISIONS AT THE CERN ISR WITH AN IDENTIFIED CHARGED HADRON OF HIGH TRANSVERSE MOMENTUM AT 90-degrees. 2. ON THE DISTRIBUTION OF CHARGED PARTICLES IN THE CENTRAL REGION

For pt.I see ibid., vol.B135, p.461 (1978). 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 degrees in the c.m.s. The momentum and charge correlations between identified high- rho /sub T/ trigger particles and other charged particles in the central region (rapidity mod y mod <3) have been studied. When the momentum of the trigger particle is increased, an increase of the density of high- rho /sub T/ particles with charge opposite to that of the trigger particle is observed in a small solid angle around the trigger particle. The sum of the momenta of charged particles inside mod y mod <1, following the trigger particle, is found to increase by about 30 MeV/c per GeV/c increase of the trigger momentum. Opposite in azimuth to the trigger particle close pairs of high- rho /sub T/ particles are observed in both neutral and doubly charged combinations. In this region one sees an indication of scaling in the x/sub E/ variable. (22 refs)

Studies of proton-proton collisions at the CERN ISR with an identified charged hadron of high transverse momentum at 900^0 ; 3, jet-like structures

For pt.II see ibid., vol.145, p.305 (1978). Results are reported from a study of proton-proton collisions at a c.m. energy of 52.6 GeV, in which a charged hadron with large transverse momentum is emitted near 90 degrees in the c.m.s. Pairs of particles opposite in azimuth to the trigger particle with transverse momenta above a fixed value show evidence for jet-like structures. Methods to isolate jet-like groups of particles are compared on the basis of a simple model of jet events. Results on the distribution and internal properties of jets from proton-proton collisions are presented, using one of these methods. The jets are found to be very similar in structure to jets observed in e/sup +/e/sup -/ annihilations and in nu p scattering, but have about 20% higher multiplicity mainly originating at small x/sub ///. The charge of the jets is correlated with the charge of the trigger particle. (23 refs)

pp collisions with a high p/sub T/ charged hadron trigger at the CERN ISR

Results are presented from an investigation of proton proton collisions at a c.m. energy of 52.6 GeV in which a charged hadron at large transverse momentum (0.5-6 GeV/c) is emitted near 90 degrees in the c.m.s.. Jet-like structures are observed, and their properties discussed in some detail. (2 refs)