Evidence for Exotic Meson Production in the Reaction ${\pi }^{-}p\to \eta {\pi }^{-}p$ at 18 GeV/c

Abstract

The $\eta {\pi }^{-}$ system has been studied in the reaction ${\pi }^{-}p\to \eta {\pi }^{-}p$ at 18 GeV/c. A large asymmetry in the angular distribution is observed indicating interference between L-even and L-odd partial waves. The $a_2(1320)$ is observed in the $J^{PC}$ = $2^{++}$ wave, as is a broad enhancement between 1.2 and 1.6 GeV/c^{2} in the $J^{PC}=1^{-+}$ wave. The observed phase difference between these waves shows that there is phase motion in addition to that due to $a_2(1320)$ decay. The data can be fitted by interference between the $a_2(1320)$ and an exotic $1^{-+}$ resonance with $\genfrac{}{}{0ex}{}{M=(1370\pm 16+50}{-30}$) MeV/c^2 and $\genfrac{}{}{0ex}{}{\Gamma =(385\pm 40+65}{-105}$) MeV/c^2.

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