Jets in e+e- annihilation

The properties of jets produced in e+e- annihilation have been investigated using data taken with the Mark 1 detector at SPEAR. The momentum distributions parallel and perpendicular to the jet axis were measured for all charged tracks, for K0's, and for rho0's. The K0 and rho0 Pt2 distributions are well fit by the form dn/dPt2 = A exp(-B+ Pt2) with B = 4.6 +/- 0.2 for K0's and 5 +/- 1 for rho0's. The charged particle Pt2 distribution cannot be fit with a single exponential, but is similar to that of K0's and rho0's above Pt2 approx. 0.2 GeV2. The charged particle and K0 parallel momentum distributions are similar in shape and approximately exponential. The production of rho0's at low parallel momentum is suppressed. The average number of rho0's per event is 0.4 +/- 0.1. 59 figures, 7 tables