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Measurement of the photon structure functionF γ2 in the reactione + e e + e +hadrons at LEP

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Zeitschrift für Physik C Particles and Fields

Abstract

We present measurements of the hadronic photon structure functionF γ2 (x), in twoQ 2 ranges with mean values of 5.9 GeV2 and 14.7 GeV2. The data were taken by the OPAL experiment at LEP, with\(\sqrt s\) close to theZ 0 mass and correspond to an integratede + e luminosity of 44.8 pb−1. In the context of a QCD-based model we find the quark transverse momentum cutoff separating the vector meson dominance (VMD) and perturbative QCD regions to be 0.27±0.10 GeV. We confirm that there is a significant pointlike component of the photon when the probe photon hasQ 2>4 GeV2. Our measurements extend to lower values ofx than any previous experiment, and no increase ofF γ2 (x) is observed.

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OPAL Collaboration., Akers, R., Alexander, G. et al. Measurement of the photon structure functionF γ2 in the reactione + e e + e +hadrons at LEP. Z. Phys. C - Particles and Fields 61, 199–208 (1994). https://doi.org/10.1007/BF01413097

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  • DOI: https://doi.org/10.1007/BF01413097

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