Total Hadronic Cross-Section of Photon-Photon Interactions at LEP
Abstract
The total hadronic cross-section sigma_gg(W) for the interaction of real photons, gg->hadrons, is measured for gg centre-of-mass energies 10<W<110 GeV. The cross-section is extracted from a measurement of the process e+e- -> e+e-g*g* -> e+e- hardrons, using a luminosity function for the photon flux together with form factors for extrapolating to real photons (Q^2=0 GeV^2). The data were taken with the OPAL detector at LEP at e+e- centre-of-mass energies 161, 172 and 183 GeV. The cross-section sigma_gg(W) is compared with Regge factorisation and with the energy dependence observed in gp and pp interactions. The data are also compared to models which predict a faster rise of sigma_gg(W) compared to gp and pp interactions due to additional hard gg interactions not present in hadronic collisions.
Keywords
Cite
@article{arxiv.hep-ex/9906039,
title = {Total Hadronic Cross-Section of Photon-Photon Interactions at LEP},
author = {The OPAL Collaboration and G. Abbiendi},
journal= {arXiv preprint arXiv:hep-ex/9906039},
year = {2008}
}
Comments
28 pages, LaTeX, including 14 eps figs, submitted to European Physical Jour. nal C. Typo fixed in Table 3