High-statistics measurement of neutral-pion pair production in two-photon collisions
High-statistics measurement of neutral-pion pair production in two-photon collisions
We present a high-statistics measurement of differential cross sections and the total cross section for the process $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ in the kinematic range $0.6\text{ }\text{ }\mathrm{GeV}\ensuremath{\le}W\ensuremath{\le}4.0\text{ }\text{ }\mathrm{GeV}$ and $|\mathrm{cos}{\ensuremath{\theta}}^{*}|\ensuremath{\le}0.8$, where $W$ and ${\ensuremath{\theta}}^{*}$ are the energy and pion scattering angle, respectively, in the $\ensuremath{\gamma}\ensuremath{\gamma}$ center-of-mass system. Differential cross sections are …