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Open Access Publications from the University of California

Multihadronic events at Ec.m.=29 GeV and predictions of QCD models from Ec.m.=29 GeV to Ec.m.=93 GeV

  • Author(s): Petersen, A
  • Abrams, G
  • Adolphsen, CE
  • Akerlof, C
  • Alexander, JP
  • Alvarez, M
  • Amidei, D
  • Baden, AR
  • Ballam, J
  • Barish, BC
  • et al.

Multihadronic e+e- 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, Q2-Q1, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, p, 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+e- data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the Z0, are also presented. © 1988 The American Physical Society.

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