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

Abstract

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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Cited by in corpus (18)

• Hybrid Mesons
• 50 Years of Quantum Chromodynamics
• Amplitude analysis of the ${\chi }_{c1}\to \eta {\pi }^{+}{\pi }^{-}$ decays
• The I^G J^{PC}=1^- 1^{-+} Tetraquark States
• Novel approaches in Hadron Spectroscopy
• The I^G J^{PC}=0^+ 1^{-+} Tetraquark State
• The phenomenology of the exotic hybrid nonet with ${\pi }_1(1600)$ and ${\eta }_1(1855)$
• The Possible J^{PC}=0^{--} Exotic State
• Light 1-+ exotics: molecular resonances
• The exotic meson ${\pi }_1(1600)$ with $J^{PC}=1^{-+}$ and its decay into $\rho (770)\pi$
• Constructing the $J^{P(C)}=1^{-(+)}$ light flavor hybrid nonet with the newly observed ${\eta }_1(1855)$
• Investigation of Mass and Decay Characteristics of the All-light Tetraquark
• Radiative production and decays of the exotic ${\eta }_1^{\prime }(1855)$ and its siblings
• The "Closed" Chiral Symmetry and Its Application to Tetraquark
• Kinematical higher-twist corrections in ${\gamma }^{\ast }\to M_1{M}_2\gamma$: Neutral meson production
• Gravitational form factors in the perturbative limit
• Decay properties of light $1^{-+}$ hybrids
• Exotic mesons: status and future