1998/10/28 by A. Gehrmann–De Ridder, A. Gehrmann-De Ridder, Ridder, A. Gehrmann-De
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9810507
15 pages, LaTeX, 7 Postscript figures included, to appear in the proceedings of the workshop on photon interactions and the photon structure, Lund, September 10-13, 1998. The complete paper, including figures, is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp98/ttp98-38/ or via www at http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/
arxiv created 1998/10/28 · openalex publication_date 1998/10/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The production of final state photons in hadronic Z-boson decays can be used to study the quark-to-photon fragmentation function Dq→ γ(z,μF). Currently, two different observables are used at LEP to probe this function: the `photon' +~1 jet rate and the inclusive photon energy distribution. We outline the results of a calculation of the `photon' +~1 jet rate at fixed \cal O(ααs), which yield a next-to-leading order determination of the quark-to-photon fragmentation function Dq→ γ(z,μF). The resulting predictions for the isolated photon rate and the inclusive photon spectrum at the same, fixed order, are found to be in good agreement with experimental data. Furthermore, we outline the main features of conventional approaches using parameterizations of the resummed solutions of the evolution equation and point out deficiencies of these currently available parameterizations in the large z-region. We finally demonstrate that the ALEPH data on the `photon' +~1 jet rate are able to discriminate between different parameterizations of the quark-to-photon fragmentation function, which are equally allowed by the OPAL photon energy distribution data.