Electroweak parameters of the z0 resonance and the standard model

Contains fulltext : 124399.pdf (publisher's version ) (Open Access

A direct search for neutralino production at LEP

This is the post-print version of the Article - Copyright @ 1990 Elsevier.A search has been performed for the production of neutralinos (χ, χ′) in e+e− annihilation at energies near the Z0 pole. No evidence for these particles was found either in searches for events with two acoplanar jets, low visible energy, and missing pt (sensitive to or in searches for single-photon events (sensitive to Z0→χχ′→χχγ). Model independent upper limits (at the 95% CL) on the branching ratio for the decay mode Z0 →χχ′ of a few 10−4 are obtained for most of the range of neutralino masses that is kinematically accessible at LEP energies. Upper limits on the mixing factor of neutralinos are also placed as a function of the neutralino masses.This study was supported by the US Dept. of Energy, US National Science Foundation, UK Science and Engineering Research Council, the A.P. Sloan Foundation, the Canadian National Sciences and Engineering Research Council, the Israeli Ministry of Science, Minerva Gesellschaft, The Japanese Ministry of Education, Science and Culture, the Monbusho International Science Research Program, the American-Israeli Bi-national Science Foundation, L'insitut de Recherche Fondamentale du Comissariat a L'Energie Atomique, and the Bundesministerium fur Forschng und Technologie

A measurement of electron production in hadronic Z0 decays and a determination of GAMMA (Z0 --> b anti-b)

Contains fulltext : 124390.pdf (postprint version ) (Open Access

A Measurement of strange baryon production in hadronic Z0 decays

Contains fulltext : 124392.pdf (publisher's version ) (Open Access

A Direct observation of quark - gluon jet differences at LEP

This is the post-print version of the Article - Copyright @ 1991 Elsevier.Quark and gluon jets in e+e− three-jet events at LEP are identified using lepton tagging of quark jets, through observation of semi-leptonic charm and bottom quark decays. Events with a symmetry under transposition of the energies and directions of a quark and gluon jet are selected: these quark and gluon jets have essentially the same energy and event environment and as a consequence their properties can be compared directly. The energy of the jets which are studied is about 24.5 GeV. In the cores of the jets, gluon jets are found to yield a softer particle energy spectrum than quark jets. Gluon jets are observed to be broader than quark jets, as seen from the shape of their particle momentum spectra both in and out of the three-jet event plane. The greater width of gluon jets relative to quark jets is also visible from the shapes of their multiplicity distributions. Little difference is observed, however, between the mean value of particle multiplicity for the two jet types.This study was supported by the Department of Energy, USA, National Science Foundation, USA, Science and Engineering Research Council, UK, Natural Sciences and Engineering Research Council, Canada, Israeli Ministry of Science, Minerva Gesellschaft, The Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science Research Program, American Israeli Bi-national Science Foundation, Direction des Sciences de la Mati6re du Commissariat l'Energie Atomique, France, Bundesministerium for Forschung und Technologie, FRG, and the A.P. Sloan Foundation