[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7974
Identified Hadron Production and Light Quark Fragmentation in
Z0 Decays
Abstract
We have measured the differential cross sections for the production of
pi+, K+, K0, K*0,phi,
p, Lambda and their corresponding antiparticles in separate
samples of flavor-tagged Z0 --> light-flavor (u
anti-u, d anti-d, or s anti-s), Z0 --> c
anti-c and Z0 --> b anti-b events. Clear
flavor dependences are observed, and the results are compared with the
predictions of three fragmentation models. We have also performed a
direct measurement of As, the parity-violating
coupling of the Z0 to strange quarks, by measuring
the left-right-forward-backward production asymmetry in polar angle of
the tagged s quark. Our preliminary result is
As = 0.82 + over - 0.10(stat.)+ over - 0.07(syst).
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