The region of validity of perturbative QCD for the photon structure function F2gamma(x, Q2)

Autor:	D M Holling, J K Storrow, L E Gordon
Rok vydání:	1994
Předmět:	Physics Quantum chromodynamics Nuclear and High Energy Physics Particle physics Photon Chiral perturbation theory Perturbative QCD High Energy Physics::Experiment Perturbation theory (quantum mechanics) Lambda Photon structure function Gluon
Zdroj:	Journal of Physics G: Nuclear and Particle Physics. 20:549-564
ISSN:	1361-6471 0954-3899
DOI:	10.1088/0954-3899/20/4/003
Popis:	We analyse the region of validity of perturbative QCD (in Q2) for the photon structure function F2gamma (x, Q2), from the standpoint of establishing the value of Q2=Q02 at which it is possible to start a perturbative evolution of F2gamma (x,Q2). We find that we can only reproduce the high Q2 data if we start our evolution at a value of Q02 at which the point-like component predicted by perturbative QCD has already developed significantly. In practice this turns out to be in the region Q2 approximately=4-5 GeV2, and at this value of Q02 it is necessary to represent the input distributions as a sum of hadronic and point-like components. We also investigate related questions such as the sensitivity of the evolved structure function to the input distributions, in particular the poorly determined gluon distribution, and to the QCD mass scale Lambda .
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ac4bc4934a027560ef67d36d773eb5f6 https://doi.org/10.1088/0954-3899/20/4/003 Zobrazit plný text záznamu