Confirmation of a pi_1^0 Exotic Meson in the ηπ^0 System

Details Confirmation of a pi_1^0 Exotic Meson in the ηπ^0 System Confirmation of a pi_1^0 Exotic Meson in the ηπ^0 System

2006-12-25

arxiv.org/abs/hep-ex/0612062v2

Phys.Lett.B657:27-31,2007

Physics

High Energy Physics

High Energy Physics - Experiment

p3, rewording the paragraph (at the bottom) about the phase variations. p4, rewording paragrath "The second method ..." . p4,

Scientific paper

10.1016/j.physletb.2007.07.068

The exclusive reaction $\pi^- p \to \eta \pi^0 n$, $\eta \to \pi^+ \pi^- \pi^0$ at 18 GeV$/c$ has been studied with a partial wave analysis on a sample of 23~492 $\eta \pi^0 n$ events from BNL experiment E852. A mass-dependent fit is consistent with a resonant hypothesis for the $P_+$ wave, thus providing evidence for a neutral exotic meson with $J^{PC} = 1^{-+}$, a mass of $1257 \pm 20 \pm 25$ MeV$/c^2$, and a width of $354 \pm 64 \pm 60$ MeV$/c^2$. New interpretations of the meson exotics in neutral $\eta \pi^0$ system observed in E852 and Crystal Barrel experiments are discussed.

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