Abstract:

The total UA2 data sample at the CERN pp̄ Collider corresponds to an integrated luminosity of 910 nb-1. Limits on various hypothetical processes, such as production of excited electrons, additional charged or neutral vector bosons, or supersymmetric particles, are presented from the analysis of this sample. © 1987.

Abstract:

A study has been made of the production characteristics of W and Z bosons produced at the CERN pp Collider. The event sample consists of 251 W→ev decays, and 39 Z→e+e- decays, identified by the UA2 detector, and corresponds to an integrated luminosity of 142 nb-1 at √s = 546 GeV, and 768 nb-1 at √s = 630 GeV. Measurements of W and Z production cross sections, of longitudinal and transverse momentum distributions, and of associated jet production, are presented. These measurements are compared with theoretical expectations, which include higher order QCD effects. © 1987.

Abstract:

A study has been made of the decays W → ev and Z → e+e-, using the UA2 detector at the CERN p̄p Collider. The data correspond to an integrated luminosity of 142 nb-1 at a centre-of-mass collision energy √s=546 GeV, and 768 nb-1 at √s=630 GeV. Measurements of the standard model parameters from samples of 251 W decay and 39 Z decay candidates are compared with expectations of the standard electroweak model. © 1987.

Abstract:

The invariant mass distribution of jet pairs observed in the UA2 central calorimeter is examined in the search for an excess of events in the region of the W± and Z bosons, which would reveal their decays into quark-antiquark pairs. We give a detailed account of the methods of analysis used to optimize the mass resolution achieving ≅±10%. A structure is observed at the level of ≅ 3 standard deviations in the mass region of W± and Z with shape and position consistent with expectation from their qq̄decays. It contains 632 ± 190 events, 1.4 standard deviations above the standard model prediction of 340 ± 80 events. © 1987.