$O(α_S)$ Corrections to the Photon Structure Functions $F^γ_2(x,Q^2)$ and $F_L^γ(x,Q^2)$

E. Laenen; S. Riemersma; J. Smith; W. L. van Neerven

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arXiv · hep-ph/9303214

$O(α_S)$ Corrections to the Photon Structure Functions $F^γ_2(x,Q^2)$ and $F_L^γ(x,Q^2)$

E. Laenen·S. Riemersma·J. Smith·W. L. van Neerven

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Abstract

We examine the QCD corrections to the structure functions $F_2^γ(x,Q^2)$ and $F_L^γ(x,Q^2)$ for a real photon target. The pointlike photon contributions from light and heavy quarks are computed through $O(αα_S)$. A parameterization of the hadronic (resolved) photon contribution is also included and a comparison is made with the present experimental data. We find that while the pointlike contributions are large for $F_2^γ(x,Q^2)$, they are the dominant part of $F_L^γ(x,Q^2)$. For $Q^2 > 50$ $({\rm GeV}/c)^2$ the charm component is as least as large as the light quark component.

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E. Laenen, S. Riemersma, J. Smith, W. L. van Neerven. 1993-03-15. $O(α_S)$ Corrections to the Photon Structure Functions $F^γ_2(x,Q^2)$ and $F_L^γ(x,Q^2)$. https://arxiv.org/abs/hep-ph/9303214

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