High-statistics measurement of neutral-pion pair production in two-photon collisions

TL;DR

This paper reports a high-statistics measurement of neutral pion pair production in two-photon collisions, revealing multiple resonant structures and providing detailed analysis of the energy dependence of the cross section.

Contribution

The study provides the first high-statistics measurement of pi^0 pi^0 production in two-photon collisions, identifying multiple resonances and analyzing their partial-wave amplitudes.

Findings

Observation of at least four resonant structures including f_0(980)

Detailed partial-wave analysis of the resonances

Preliminary results on higher-energy data with increased luminosity

Abstract

We have measured the cross section for pi^0 pi^0 production in two-photon collisions using a data sample with an ntegrated luminosity of 95 fb^-1 collected with the Belle detector. We find at least four resonant structures including a peak from f_0(980), and a fitting of the result to partial-wave amplitudes assuming some resonances are applied. We also make a discussion on the higher-energy region data based on the preliminary results from an increased sample corresponding to the integrated luminosity of 223 fb^-1.