Study of meson properties and structures through high-statistics measurement of cross sections in two-photon production

我们在贝儿B工厂实验上测量和分析了介子对γγ→π^+π^-、π^0π^0、π^0η和ηη的双光子产生微分截面。这些数据比以前的实验高出两到三个数量级，并且是目前世界上唯一具有这种统计水平的实验。这些数据将有助于揭示迄今为止神秘的低能区低质量标量介子的性质和结构。此外，他们提供了直接的手段来检查预测的排他性过程QCD（量子色动力学，强相互作用理论）在高能区。

We have measured and analyzed differential cross sections of two-photon production of meson pairs : γγ→π^+π^-,π^0π^0,π^0η and ηη at B-factory experiment, Belle. These data are of two to three orders of magnitude higher statistics than previous experiments and of only ones presently available with this level of statistics in the world. These data would shed light to properties and structures of hitherto mysterious low mass scalar mesons in the low energy region. Furthermore, they provide direct mean to check predictions on exclusive processes from QCD (Quantum Chromodynamics, theory of strong interaction) in the high energy region.