The inclusive production cross sections and mean multiplicities of K, p, and p in e+e- annihilation at a c.m. energy of 29 GeV have been measured with the time-projection chamber at PEP, using ionization energy loss to separate particle types. On average, 10.70.6, 1.350.13 K, and 0.600.08 p,p are contained in an annihilation event. The fraction of pions among final-state particles decreases from over 95% at 0.3 GeV/c momentum to about 60% at high momentum; the kaon and proton fractions rise correspondingly.
ASJC Scopus subject areas
- Physics and Astronomy(all)