# $π^ π^-$ and $π^0 π^0$ pair production in photon-photon and in ultraperipheral ultrarelativistic heavy ion collisions

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We discuss ${\gamma}{\gamma}\to {\pi}{\pi}$ reactions, starting from the two-pion threshold up to about $\sqrt{s {{\gamma}{\gamma}}}$ = 6 GeV. We include the dipion continuum due to pion exchange (for ${\pi}^+{\pi}^-$) and ${ ho}^\pm$ exchange (for ${\pi}^0{\pi}^0$) as well as

Author: Mariola Kłusek-Gawenda; Antoni Szczurek

Source: https://archive.org/