PS05 Hadronic Physics
Exclusive production of hadron pairs in two-photon interactions
DPNC, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
Accepted: 10 October 2003
Published online: 23 October 2003
The knowledge of two-photon processes increased during the last years thanks to the large sample of events collected at LEP. Non perturbative QCD phenomena are investigated through the study of exclusive meson and baryon pair production. The cross sections are measured as a function of the γ γ center-of-mass energy, W γ γ , and the center-of-mass production angle of the hadron, θ *. Exclusive ρ 0 ρ 0 and ρ + ρ – production for quasi-real photons are investigated through a spin-parity-helicity analysis. Exclusive ρ 0 ρ 0 production is also studied as a function of the photon virtuality Q 2 and compared to recent QCD predictions.
PACS: 13.66Bc Hadron production in interactions
© Società Italiana di Fisica, Springer-Verlag, 2004