Abstract
We have measured the cross section andQ 2-dependence of the reaction γγ→ multihadrons, using the CELLO detector at DESY, for visible final-state masses between 4 and 9 GeV. The data are well fitted by an incoherent sum of Generalised Vector Meson Dominance and Quark Parton Model terms, but at lowQ 2 require the addition of a third component which resembles the QPM but is less two-jet-like. With and without this term, the GVDM cross section atQ 2=0 is found to be 200±20 and 250±25 nb, respectively.
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CELLO Collaboration., Behrend, H.J., Criegee, L. et al. Studies of multihadronic final states in photon-photon interactions. Z. Phys. C - Particles and Fields 51, 365–375 (1991). https://doi.org/10.1007/BF01548558
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DOI: https://doi.org/10.1007/BF01548558