Measurements of $\pi^0\pi^0$ production and form factors for $f_0(980)$ and $f_2(1270)$ in single-tag two-photon process postprint

Abstract: We report a measurement of differential cross section of π0 pair production in single-tag two-photon collisions. These results are obtained with 759fb−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 GeV < W < 2.1 GeV and |cosθ∗| < 1.0 for the total energy and pion scattering angle, respectively. The transition form factor of the f0(980) and that of the f2(1270)with the helicity-0,-1, and -2 components separately are measured for the first time and are compared with theoretical calculations.