Study of single Z-boson production and Compton scattering in electron -positron collisions at LEP at centre-of-mass energies up to 209 GeV
Abstract
This thesis discusses two main topics. First, the cross section of the process e+e−→Ze+e − is measured with 0.7 ph− of data collected with the L3 detector at LEP. Decays of the Z boson into quarks and muons are considered at center-of-mass energies ranging frond 183 GeV up to 209 GeV. The measurements are found to agree with Standard Model predictions, achieving a precision of about 10% for the hadronic channel. Second, Compton scattering of quasi-real virtual photons, γe ±→γe±, is studied with 0.6 fb−1 of data collected by the L3 detector at LEP at center-of-mass energies [special characters omitted] = 189--209GeV. About 4500 events produced by the interaction of virtual photons emitted by particles of one beam with particles of the opposite beam are collected for effective center-of-mass energies of photon-electron and photon-positron systems in the range [special characters omitted] = 35 GeV up to [special characters omitted] = 175 GeV, the highest energy at which Compton scattering was ever probed. The cross sections of the γe±→γe ± process as a function of [special characters omitted] and the differential cross section with respect to scattering angle, &thetas;*, are measured and combined with previous L3 measurements down to [special characters omitted] ≃ 20 GeV, and found to agree with the QED expectations.
Degree
Ph.D.
Advisors
Gutay, Purdue University.
Subject Area
Particle physics
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