Studies of jet fragmentation in large p/sub T/ events at the ISR

In an experiment done with the SFM-facility at the CERN-ISR, the authors studied events with a high p/sub T/ particle ( pi /sup +/, pi /sup -/, K/sup -/, p) produced at theta =20 degrees and theta =45 degrees . The distribution of leading fragments of the spectator jet in the same rapidity hemisphere as the trigger depends strongly on the kind of trigger particle involved. These distributions agree with predictions from dimensional counting rules, if parton scattering via vector gluon exchange is assumed for the large p/sub T/ process. The average charge of the fastest particle (jet leader) in the away jet is approximately=1/3 independent of the trigger charge, a value expected if 3 valence quarks participate in the hard scattering process. For transverse momenta of approximately=GeV/c the rho /sup 0// pi /sup +or-/ production ratio is near unity. (12 refs).