Measurements of π0π0 production and form factors for f0(980) and f2(1270) in single-tag two-photon process

A measurement is reported of differential cross section of π0 pair production in single-tag two-photon collisions. These results are obtained with 759 fb-1 of the data collected with the Belle detector at the KEKB asymmetric energy e+e- collider. The cross section is measured for Q2 up to 30 GeV2, where Q2 is the negative of the invariant mass squared of the tagged virtual photon, in the kinematic range 05<W<21 GeV and |cos θ*|<10 for the total energy and pion scattering angle, respectively. 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.