Measuring the Photon Fragmentation Function at HERA

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dc.creatorRidder, A. Gehrmann-De
dc.creatorGehrmann, T.
dc.creatorPoulsen, E.
dc.date2006-04-04
dc.date.accessioned2026-07-07T12:25:28Z
dc.date.available2026-07-07T12:25:28Z
dc.descriptionThe production of final state photons in deep inelastic scattering originates from photon radiation off leptons or quarks involved in the scattering process. Photon radiation off quarks involves a contribution from the quark-to-photon fragmentation function, corresponding to the non-perturbative transition of a hadronic jet into a single, highly energetic photon accompanied by some limited hadronic activity. Up to now, this fragmentation function was measured only in electron-positron annihilation at LEP. We demonstrate by a dedicated parton-level calculation that a competitive measurement of the quark-to-photon fragmentation function can be obtained in deep inelastic scattering at HERA. Such a measurement can be obtained by studying the photon energy spectra in $γ+ (0+1)$-jet events, where $γ$ denotes a hadronic jet containing a highly energetic photon (the photon jet). Isolated photons are then defined from the photon jet by imposing a minimal photon energy fraction. For this so-called democratic clustering approach, we study the cross sections for isolated $γ+ (0+1)$-jet and $γ+ (1+1)$-jet production as well as for the inclusive isolated photon production in deep inelastic scattering.
dc.description23 pages, LaTeX
dc.identifierhttps://arxiv.org/abs/hep-ph/0604030
dc.identifierhttp://arxiv.org/abs/hep-ph/0604030
dc.identifierEur.Phys.J.C47:395-411,2006
dc.identifierdoi:10.1140/epjc/s2006-02574-x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214618
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasuring the Photon Fragmentation Function at HERA
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