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.

p3, rewording the paragraph (at the bottom) about the phase variations. p4, rewording paragrath "The second method ..." . p4, at the bottom of paragrath "The third method ..." added consistent with the results of methods 1 and 2"

References in corpus (9)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Production and Decay of Hybrid Mesons by Flux-Tube Breaking
• Evidence for Exotic Meson Production in the Reaction ${\pi }^{-}p\to \eta {\pi }^{-}p$ at 18 GeV/c
• Hybrid and Conventional Mesons in the Flux Tube Model: Numerical Studies and their Phenomenological Implications
• Orbitally excited and hybrid mesons from the lattice
• Evidence for Exotic J^{PC}=1^{-+} Meson Production in the Reaction pi- p --> eta pi- p at 18 GeV/c
• A Study of the ηπ^{0} Spectrum and Search for a J^{PC} = 1^{-+} Exotic Meson
• Exotic hybrid mesons with light quarks

Cited by in corpus (39)

• QCD and strongly coupled gauge theories: challenges and perspectives
• Hybrid Mesons
• 50 Years of Quantum Chromodynamics
• Determination of the pole position of the lightest hybrid meson candidate
• Light isovector resonances in ${\pi }^{-}p\to {\pi }^{-}{\pi }^{-}{\pi }^{+}p$ at 190 GeV/$c$
• The Status of Exotic-quantum-number Mesons
• Coupled-channel approach in hadron-hadron scattering
• Light-Meson Spectroscopy with COMPASS
• Amplitude analysis of the ${\chi }_{c1}\to \eta {\pi }^{+}{\pi }^{-}$ decays
• Extended chiral Khuri-Treiman formalism for $\eta \to 3\pi$ and the role of the $a_0(980)$, $f_0(980)$ resonances
• The I^G J^{PC}=1^- 1^{-+} Tetraquark States
• Novel approaches in Hadron Spectroscopy
• Mass Spectrum of Heavy Quarkonium Hybrids
• Amplitude analyses of the decays chi_c1 -> eta pi+ pi- and chi_c1 -> eta' pi+ pi-
• 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 Decay Properties of the 1^{-+} Hybrid State
• The Possible J^{PC}=0^{--} Exotic State
• Exotic $J^{PC}=1^{-+}$ mesons in a holographic model of QCD
• Light 1-+ exotics: molecular resonances
• The exotic meson ${\pi }_1(1600)$ with $J^{PC}=1^{-+}$ and its decay into $\rho (770)\pi$
• Masses of the Bottom-Charm Hybrid $\bar{b}Gc$ States
• Possible $J^{PC}=0^{+-}$ Exotic State
• 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
• Lepton flavor violation decays of vector mesons in unparticle physics
• QCD quark cyclobutadiene and light tetraquark spectrum
• Hybrid exotic meson with J^{PC}=1^{-+} in AdS/QCD
• Exotic tetraquark states with $J^{PC}=0^{+-}$
• 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
• Quasi-exotic open-flavor mesons
• Light tetraquark states with the exotic quantum number $J^{PC}=3^{-+}$
• Gravitational form factors in the perturbative limit
• Decay properties of light $1^{-+}$ hybrids
• Investigation of the Lightest Hybrid Meson Candidate with a Coupled-Channel Analysis of $\bar{p}p$-, ${\pi }^{-}p$- and $\pi \pi$-Data
• Exotic mesons: status and future
• Chiral corrections to the $1^{-+}$ exotic meson mass