Multihadronic events atEc.m.=29 GeV and predictions of QCD models fromEc.m.=29 GeV toEc.m.=93 GeV

Quantum Physics Particle and Plasma Physics 0103 physical sciences Molecular Nuclear Atomic Nuclear & Particles Physics 01 natural sciences Astronomical and Space Sciences
DOI: 10.1103/physrevd.37.1 Publication Date: 2002-07-26T20:52:55Z
AUTHORS (132)
ABSTRACT
Multihadronic e/sup +/e/sup -/ annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, Q/sub 2/-Q/sub 1/, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, p/sub perpendicular/, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing e/sup +/e/sup -/ data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the Z/sup 0/, are also presented.
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