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Certain Uncertainties in QCD Theory Predictions for Large-PT Photons and Other Processes

  • A. P. Contogouris
Part of the NATO ASI Series book series (NSSB, volume 197)

Abstract

In general there are more than one scale (large variable) determining perturbative QCD quantities: E.g. the renormalization scale μ entering the running coupling α 8 (μ) (related with the renormalization procedure), and the factorization scale M entering the structure functions F(x,M) (determining the scale violations). Until recently, for large transverse momentum P T ) processes, simplicity suggested the choice
$${{\mu }^{2}}={{M}^{2}}=\alpha p_{T}^{2}$$
(1)
where α = positive and of 0(1), or other choices phenomenologically equivalent; hereafter P T will be called physical scale.

Keywords

Gluon Distribution Soft Gluon Physical Scale Inclusive Cross Section Direct Photon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • A. P. Contogouris
    • 1
  1. 1.Department of PhysicsMcGill UniversityMontrealCanada

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