[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7766
Production of
pi+, K+, K0,
K*0, Phi, p and Lambda0
in Hadronic
Z0 Decays
Abstract
We have measured the differential production cross sections as a
function of scaled momentum xp =
2p/Ecm of the identified hadron species
pi+, K+, K0, K*0, Phi,
p, Lambda0 and of the corresponding antihadron
species in inclusive hadronic Z0 decays, as well as
separately for Z0 decays into light (u,d,s),
c and b flavors.
Clear flavor dependences are observed, consistent with expectations
based upon previously measured production and decay properties of
heavy hadrons. These results were used to test the QCD predictions of
Gribov and Lipatov, the predictions of QCD in the Modified Leading
Logarithm Approximation with the ansatz of Local Parton-Hadron
Duality, and the predictions of three fragmentation models. Ratios of
production of different hadron species were also measured as a
function of
xp
and were used to study the
suppression of strange meson, strange and non-strange baryon, and
vector meson production in the jet fragmentation process. The
light-flavor results provide improved tests of the above predictions,
as they remove the contribution of heavy hadron production and decay
from that of the rest of the fragmentation process. In addition we
have compared hadron and antihadron production as a function of
xp
in light quark (as opposed to antiquark) jets. Differences are
observed at high
xp,
providing direct evidence that higher-momentum hadrons are more
likely to contain a primary quark or antiquark. The differences for
pseudoscalar and vector kaons provide new measurements of strangeness
suppression for high-xp fragmentation products.
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