Lightest scalar and tensor resonances in $\gamma \gamma \to \pi \pi$ after the Belle experiment

N. N. Achasov, G. N. Shestakov

New high statistics Belle data on the $\gamma \gamma \to {\pi }^{+}{\pi }^{-}$ reaction cross section measured in the range of pion-pair invariant masses $\sqrt{s}$ between 0.8 GeV and 1.5 GeV are analyzed t…