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Measuring the photon fragmentation function at HERA

  • Theoretical Physics
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Abstract

The 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.

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Authors and Affiliations

  1. Institute for Theoretical Physics, ETH Zürich, 8093, Zürich, Switzerland

    A. Gehrmann-De Ridder

  2. Institut für Theoretische Physik, Universität Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland

    T. Gehrmann & E. Poulsen

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  1. A. Gehrmann-De Ridder
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  2. T. Gehrmann
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  3. E. Poulsen
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Correspondence to A. Gehrmann-De Ridder.

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Gehrmann-De Ridder, A., Gehrmann, T. & Poulsen, E. Measuring the photon fragmentation function at HERA. Eur. Phys. J. C 47, 395–411 (2006). https://doi.org/10.1140/epjc/s2006-02574-x

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  • DOI: https://doi.org/10.1140/epjc/s2006-02574-x

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