Tandler, Joachim: Exclusive Production of J/ψ Mesons in the ZEUS Detector. - Bonn, 2003. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5n-02108
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5n-02108,
author = {{Joachim Tandler}},
title = {Exclusive Production of J/ψ Mesons in the ZEUS Detector},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2003,
volume = 2003-06,
note = {Exclusive J/ψ production has been studied using the ZEUS detector at HERA. Two ranges of the photon virtuality, Q2 < 1 GeV2 and 0.15 < Q2 < 0.8 GeV2 are examined. The latter is defined by requiring the scattered electron to be detected in the Beam Pipe Calorimeter under low angles. The J/ψ mesons have been identified via the decay J/ψ -> e+ e-. The cross sections are measured as a function of the photon-proton centre-of-mass energy, W. The data used were taken during the 1999 and 2000 running periods, which yielded an integrated luminosity of 68.7 pb-1.
The measured W dependences are in agreement with each other and the values obtained in high-Q2 (2 < Q2 < 100 GeV2) measurements. This leads to the conclusion that J/ψ production is a hard process for all Q2 values and can be described with models based on perturbative QCD.
Electron-pion separation of the ZEUS Transition Radiation Detector is measured. A method to combine TRD information and dE/dx measurements from the central drift chamber is developed and applied to the Q2 < 1 GeV2 J/ψ sample.},

url = {https://hdl.handle.net/20.500.11811/1912}

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