Report

PUBDB-2023-04611

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Photon-photon Inclusive Scattering and Perturbative QCD

Maor, U.

1987

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Please use a persistent id in citations: doi:10.3204/PUBDB-2023-04611

Report No.: DESY-87-117

Abstract: Perturbative QCD expectations and problems associated with the study of the photon structure function data are reviewed. An assessment is given for the viability and sensitivity of photon-photon scattering as a decisive tool for the determination of the QCD scale. Particular attention is given to the theoretical problems of singularity cancellations at $x = 0$ and threshold-associated difficulties at $x = 1$ and their implications on the actual data analysis. It is concluded that the experimental results, while not providing a decisive verification of QCD at small distances, do add to other independent experiments which are all consistent with the theory and suggest a reasonably well defined QCD scale parameter. The importance of the small $Q^2$ limit to photon-photon analysis is discussed and the data is examined in an attempt to identify and isolate the contributions of the hadronic and point-like sectors of the target photon.

Keyword(s): TALK: ZAKOPANE 1987 ; PHOTON PHOTON: INCLUSIVE REACTION ; PHOTON: STRUCTURE FUNCTION ; QUANTUM CHROMODYNAMICS: PERTURBATION THEORY ; MODEL: QUARK PARTON ; NUMERICAL CALCULATIONS: INTERPRETATION OF EXPERIMENTS

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Contributing Institute(s):

1. DESY Retrocat (DESY(-2012))

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Experiment(s):

1. No specific instrument

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Database coverage:

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