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Abstract:

The electroweak production asymmetry and the decay fragmentation function for e⁺e^- → cc have been measured at s = 29 GeV using charged D^* production over the full kinematic range. The data were taken at PEP using the High Resolution Spectrometer. The measured asymmetry is -0.12 ± 0.08. The total production cross section in units of the point cross section corrected for initial state radiation is RD^* = 2.7 ± 0.9. © 1984.

Abstract:

Fragmentation properties of a sample of two-jet events measured by the UA2 detector at the CERN pp Collider are described. The energy flow is compared with different model predictions. The charged particle multiplicity in jets is found to exceed extrapolations from lower energy e+e- jet data. © 1984.

Abstract:

Jet production properties at s = 540 GeV have been measured in the UA2 detector at the CERN pp Collider. Results on the total transverse momentum of the jet system, on the parton density in the nucleon (structure function) and on the two-jet angular distributions are reported. The data are compared with QCD predictions and extrapolations from lower energy experiments. © 1984.

Abstract:

The production of electrons with very high transverse momentum has been studied in the UA2 experiment at the CERN {Mathematical expression} collider ( {Mathematical expression}=540 GeV). From a sample of events containing an electron candidate with pT>15 GeV/c, we extract a clear signal resulting from the production of the charged intermediate vector boson W±, which subsequently decays into an electron and a neutrino. We study the W production and decay properties. Further-more, we refine our results on the production and decay of the neutral vector boson Z0. Finally, we compare the experimental results to the predictions of the standard model of the unified electro-weak theory. © 1984 Springer-Verlag.

Abstract:

We have observed inclusive production of D0 and D+ mesons, and their charge conjugates, in e+e- annihilation at 29 GeV on the basis of a data sample of 106 pb-1. These signals correspond to R values of R (D0+D0)=1.8±0.5 and R (D++D-)=1.2±0.4. Taking the D+ and D0 data together, we measure a charge asymmetry of A=-0.08±0.12 for charmed quarks. A comparison of R (D+D) with R (D*+D*) obtained via the process D*+D0+ gives a DD* ratio of 1.0-0.2+0.3, indicating that direct D* production dominates over direct D production. © 1984 The American Physical Society.