Measurement of neutral pion pair production in two-photon collisions
Abstract
The differential cross section of the process gamma gamma -> pi0 pi0 has been measured in the kinematical range 0.6 GeV < W < 4.0 GeV and |cos theta*|<0.8 in energy and pion scattering angle, respectively, in the gamma gamma center-of-mass system. We find at least four resonant structures including a peak from f0(980). In addition, there is evidence for chic0 production. We also make a preliminary discussion of the angular dependence and cross section ratio to gamma gamma -> pi+ pi-.
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