Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1998-08-13
Eur.Phys.J.C6:253-264,1999
Physics
High Energy Physics
High Energy Physics - Experiment
24 pages, LaTeX, 10 eps figures included, submitted to European Physics Journal C
Scientific paper
10.1007/s100529801028
The production of charged hadrons and K_s mesons in the collisions of quasi-real photons has been measured using the OPAL detector at LEP. The data were taken at e+e- centre-of-mass energies of 161 and 172 GeV. The differential cross-sections as a function of the transverse momentum and the pseudorapidity of the charged hadrons and K_s mesons have been compared to the leading order Monte Carlo simulations of PHOJET and PYTHIA and to perturbative next-to-leading order (NLO) QCD calculations. The distributions have been measured in the range 10-125 GeV of the hadronic invariant mass W. By comparing the transverse momentum distribution of charged hadrons measured in gamma-gamma interactions with gamma-proton and meson-proton data we find evidence for hard photon interactions in addition to the purely hadronic photon interactions.
et al Ackerstaff K.
The OPAL Collaboration
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