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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 isobserved 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 broadenhancement between 1.2 and 1.6 GeV/c^{2} in the $J^{PC} = 1^{-+}$ wave. Theobserved phase difference between these waves shows that there is phase motionin addition to that due to $a_{2}(1320)$ decay. The data can be fitted byinterference between the $a_{2}(1320)$ and an exotic $1^{-+}$ resonance with $M= (1370 \pm 16 {+50}\atop{-30}$) MeV/c^2 and $\Gamma =(385 \pm 40{+65}\atop{-105}$) MeV/c^2

physical review letters

Evidence for Exotic Meson Production in the Reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="italic">p</mml:mi><mml:mo>→</mml:mo><mml:mi mathvariant="italic">η</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="italic">p</mml:…

Evidence for Exotic Meson Production in the Reactionπ−p→ηπ−p