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PT(P=3,NAME=OUT)**2 - MEAN SQUARE OF THE PROJECTION OF THE ASSOCIATED PARTICLE TRANSVERSE MOMENTUM ONTO THE NORMAL TO THE TRIGGER PARTICLE PRODUCTION PLANE.
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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.
Aplanarity distribution.
QX Distribution(QX=SQRT(3)*(Q3-Q2)).
The (Q2-Q1) distribution.
Light ion collisions with carbon target at 4.2 GeV/c/N are studied. Pion multiplicity distributions, momentum and angular spectra are analysed. These data are described in terms of models assuming independent interactions of nucleons from the projectile nucleus with the target.
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Axis error includes +- 6/6 contribution (THE NUMBER OF NEUTRAL STARS WAS CORRECTED FOR ACCIDENTAL STARS WITHOUT FORMER INTERACTIONS AND FOR STARS PRODUCED BY KL MESONS, THE LAMBDA AND KS PARTICLES YIELD BEING NEGLECTEDTHE MOMENTUM OF NEUTRON IN THE STAR WAS TAKEN OF ONE AND A HALF OF TOTAL MOMENTUM OF CHARGED PARTICLES IN THE STAR).
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FOR P< 1. GEV DATA FOR PROTONS WITH P < .7 WERE USED.
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