Measurements of $π^{0}π^{0}$ production and form factors for $f_{0}(980)$ and $f_{2}(1270)$ in single-tag two-photon process

Qingnian Xu

paper

Measurements of $π^{0} π^{0}$ production and form factors for $f_{0} (980)$ and $f_{2} (1270)$ in single-tag two-photon process

arXiv:1512.00162

Abstract

We report a measurement of differential cross section of $π^{0}$ pair production in single-tag two-photon collisions. These results are obtained with 759 $f b^{- 1}$ of the data collected with the Belle detector at the KEKB asymmetric energy $e^{+} e^{-}$ collider. 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 virtual photon, in the kinematic range 0.5 GeV < $W$ < 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.

arXiv commentProceedings of the PhiPsi15, Sep. 23-26, 2015, Hefei, China

Measurements of π0π0 production and form factors for f0​(980) and f2​(1270) in single-tag two-photon process

Abstract

Measurements of $π^{0} π^{0}$ production and form factors for $f_{0} (980)$ and $f_{2} (1270)$ in single-tag two-photon process