Total Hadronic Cross-Section of Photon-Photon Interactions at LEP

Details Total Hadronic Cross-Section of Photon-Photon Interactions at LEP Total Hadronic Cross-Section of Photon-Photon Interactions at LEP

1999-06-28

arxiv.org/abs/hep-ex/9906039v2

Eur.Phys.J.C14:199-212,2000

Physics

High Energy Physics

High Energy Physics - Experiment

28 pages, LaTeX, including 14 eps figs, submitted to European Physical Jour. nal C. Typo fixed in Table 3

Scientific paper

10.1007/s100520000352

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 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.

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