Production of Polarized Baryons in Polarized and Unpolarized E exp + E exp - Collisions

摘要

Polarized and unpolarized e exp + e exp - annihilation is considered in lowest order at energies 30 to 150 GeV taking gamma and Z exp 0 exchange in the standard SU(2)xU(1) model into account. The fragmentation of polarized quarks into polarized baryons is described by two kinds of fragmentation functions; the first is based on SU(6) weights and empirical expressions for favoured and disfavoured fragmentation; the second is based upon a Monte Carlo model of the chain decay including helicities of quarks and hadrons. From the cross sections for e exp + e exp - implies qantiq and the fragmentation functions we obtain predictions for the baryon polarization as function of the collision energy and of kinematical variables. (Atomindex citation 13:673726)