Study ofπ0pair production in single-tag two-photon collisions
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Abstract
We report a measurement of the differential cross section of 0 pair production in single-tag two-photon collisions, 0 0 , in e e -scattering. The cross section is measured for Q 2 up to 30 GeV 2 , where Q 2 is the negative of the invariant mass squared of the tagged photon, in the kinematic range 0.5 GeV < W < 2.1 GeV and j cos j < 1.0 for the total energy and pion scattering angle, respectively, in the center-of-mass system. The results are based on a data sample of 759 fb -1 collected with the Belle detector at the KEKB asymmetric-energy e e -collider. The transition form factor of the f 0 980 and that of the f 2 1270 with the helicity-0, -1, and -2 components separately are measured for the first time and are compared with theoretical calculations.