Journal article
Measurement of the low-cursive greek chi behaviour of the photon structure function Fγ2
G Abbiendi, K Ackerstaff, C Ainsley, PF Akesson, G Alexander, J Allison, KJ Anderson, S Arcelli, S Asai, SF Ashby, D Axen, G Azuelos, I Bailey, AH Ball, E Barberio, RJ Barlow, S Baumann, J Bechtluft, T Behnke, KW Bell Show all
European Physical Journal C | SPRINGER | Published : 2000
Abstract
The photon structure function Fγ2(cursive Greek chi, Q2) has been measured using data taken by the OPAL detector at e+e- centre-of-mass energies of 91 GeV, 183 GeV and 189 GeV, m Q2 ranges of 1.5-30.0 GeV2 (LEP1) and 7.0-30.0 GeV2 (LEP2), probing lower values of cursive Greek chi than ever before. Since previous OPAL analyses, new Monte Carlo models and new methods, such as multi-variable unfolding have been introduced, reducing significantly the model dependent systematic errors in the measurement. The results do not conclusively prove, but are completely consistent with, the presence of a rise in Fγ2 at low-cursive Greek chi as expected from QCD.