Meson resonances in forward-angle ${\pi }^{+}{\pi }^{-}$ photoproduction

Abstract

Assuming that the ${\pi }^{+}{\pi }^{-}$ photoproduction at forward angles and high energies is dominated by one pion exchange we calculate the ${\pi }^{+}{\pi }^{-}$ mass distributions for low partial waves. Predictions of the model agree well Assuming that the ${\pi }^{+}{\pi }^{-}$ photoproduction at forward angles and high energies is dominated by one pion exchange we calculate the ${\pi }^{+}{\pi }^{-}$ mass distributions for low partial waves. Predictions of the model agree well with the experimental data which indicate that the $S$, $P$ and $D$ waves are dominated by the $f_0(980)$, $\rho (770)$ and $f_2(1270)$, resonances respectively.

6 pages, 7 figures