Untersuchung der ln (1/x) -Verteilung mit JADE-Daten bei 22-44 GeV
type: CreativeWork
description: This dissertation containts studis of physical processes investigated with accelerator data from the experiments JADE and OPAL. In the accelerators PETRA at DESY and LEP at CERN electrons and positrons were colliding. The events contain cascades of charged and neutral particles. Hadrons are the only one possible bounded state of quarks and gluons, knewn also as partons, which can exist in the nature. The quarks and gluons are the elementar components of the quantum chromodynamic (QCD). QCD is the theory which describes the strong interaction between quarks and gluons. Quarks appear in different species named flavours. The central point in this analysis is the reanalysis of the JADE data. It was shown that the new Monte-Carlo simulation of the JADE detector describes the data well. We measured for the first time with JADE data at 22, 35 and 44 GeV the ln(1/x) distribution for charged particles stemming from the annihilation of electrons and positrons in hadronic events. In the expresion ln(1/x) is x the fractional momentum of the hadrons. The theoretical shape of the ln(1/x) distribution is a consequence of the destructive interference between soft gluon contributions. The theoretical prediction for the shape of the ln(1/x) distribution used in this work is the Fong-Webber parametrisation. At small x the Fong-Webber parametrisation was performed by summing all divergences of the NLLA, one of the QCD computing approaches which uses all leading and next-to-leading logarithms in a given expansion parameter, for example in x. In agreement with the destructive interference between soft gluon contributions the hadron production at small x is suppressed. This dissertation containts also an important test of QCD. The center-of-mass energy dependence of the peak position of the ln(1/x) distribution between 22 and 201 GeV, with JADE data between 22 and 44 GeV and with published OPAL data above 91 GeV was studied. The NLLA prediction for the peak position of the ln(1/x) distrib…
abstract: This dissertation containts studis of physical processes investigated with accelerator data from the experiments JADE and OPAL. In the accelerators PETRA at DESY and LEP at CERN electrons and positrons were colliding. The events contain cascades of charged and neutral particles. Hadrons are the only one possible bounded state of quarks and gluons, knewn also as partons, which can exist in the nature. The quarks and gluons are the elementar components of the quantum chromodynamic (QCD). QCD is the theory which describes the strong interaction between quarks and gluons. Quarks appear in different species named flavours. The central point in this analysis is the reanalysis of the JADE data. It was shown that the new Monte-Carlo simulation of the JADE detector describes the data well. We measured for the first time with JADE data at 22, 35 and 44 GeV the ln(1/x) distribution for charged particles stemming from the annihilation of electrons and positrons in hadronic events. In the expresion ln(1/x) is x the fractional momentum of the hadrons. The theoretical shape of the ln(1/x) distribution is a consequence of the destructive interference between soft gluon contributions. The theoretical prediction for the shape of the ln(1/x) distribution used in this work is the Fong-Webber parametrisation. At small x the Fong-Webber parametrisation was performed by summing all divergences of the NLLA, one of the QCD computing approaches which uses all leading and next-to-leading logarithms in a given expansion parameter, for example in x. In agreement with the destructive interference between soft gluon contributions the hadron production at small x is suppressed. This dissertation containts also an important test of QCD. The center-of-mass energy dependence of the peak position of the ln(1/x) distribution between 22 and 201 GeV, with JADE data between 22 and 44 GeV and with published OPAL data above 91 GeV was studied. The NLLA prediction for the peak position of the ln(1/x) distrib…
author: Blumenstengel, Mona
language: ger
keywords: info:eu-repo/classification/ddc/530, Physik, Quantenchromodynamic, Quark-Masseneffekte
date published: 2002
date modified: 2026-07-30T19:42:09Z
provider: RWTH Aachen University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Publikationsserver der RWTH Aachen University