Perturbative QCD calculation of real and virtual Compton scattering

Glennys R. Farrar, Huayi Zhang

    Research output: Contribution to journalArticle

    Abstract

    We present the predictions of perturbative QCD for Compton scattering as a function of photon virtuality. Individual helicity amplitudes are given, along with formulas to permit calculation of the eNeN amplitudes. We discover remarkable structure in some of the amplitudes as a function of photon virtuality. Since eNeN contains a contribution from Bethe-Heitler scattering, whose magnitude and phase are known, the phases of the virtual Compton amplitudes can in principle be measured by interference with it. It has been shown that the leading-twist behavior of high-energy, large-angle Compton scattering is not affected by soft physics; thus at sufficiently high energies these predictions provide a stringent test of QCD.

    Original languageEnglish (US)
    Pages (from-to)3348-3359
    Number of pages12
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume41
    Issue number11
    DOIs
    StatePublished - 1990

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    quantum chromodynamics
    scattering
    photons
    predictions
    interference
    physics
    energy

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Perturbative QCD calculation of real and virtual Compton scattering. / Farrar, Glennys R.; Zhang, Huayi.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 41, No. 11, 1990, p. 3348-3359.

    Research output: Contribution to journalArticle

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    AB - We present the predictions of perturbative QCD for Compton scattering as a function of photon virtuality. Individual helicity amplitudes are given, along with formulas to permit calculation of the eNeN amplitudes. We discover remarkable structure in some of the amplitudes as a function of photon virtuality. Since eNeN contains a contribution from Bethe-Heitler scattering, whose magnitude and phase are known, the phases of the virtual Compton amplitudes can in principle be measured by interference with it. It has been shown that the leading-twist behavior of high-energy, large-angle Compton scattering is not affected by soft physics; thus at sufficiently high energies these predictions provide a stringent test of QCD.

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