Confirmation of a pi₁⁰ Exotic Meson in the η π⁰ System

G. S. Adams , T. Adams , Z. Bar-Yam , J. M. Bishop , V. A. Bodyagin , D. S. Brown , N. M. Cason , M. Chasse

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S. U. Chung J. P. Cummings A. I. Demianov K. Danyo J. P. Dowd P. Eugenio X. L. Fan A. M. Gribushin R. W. Hackenburg M. Hayek J. Hu E. I. Ivanov D. Joffe W. Kern E. King O. L. Kodolova V. L. Korotkikh M. A. Kostin J. Krenkel J. Kuhn J. M. LoSecco M. Lu L. V. Malinina J. J. Manak M. Nozar C. Olchanski A. I. Ostrovidov T. K. Pedlar L. I. Sarycheva K. K. Seth N. Shenhav X. Shen W. D. Shephard N. B. Sinev D. L. Stienike J. S. Suh S. A. Taegar A. Tomaradze I. N. Vardanyan D. P. Weygand D. B. White H. J. Willutzki M. Witkowski A. A. Yershov

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classification ✦ hep-ex

keywords mesone852exoticneutralsystemwaveanalysisbarrel

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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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Confirmation of a pi₁⁰ Exotic Meson in the η π⁰ System

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