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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
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ηπ+ π- resonant structure around 1.8 GeV/c(2) and η(1405) in J/ψ → ωηπ+ π-.

M Ablikim1, M N Achasov, D Alberto

  • 1Institute of High Energy Physics, Beijing 100049, China.

Physical Review Letters
|November 24, 2011
PubMed
Summary

Researchers observed a new particle, X(1870), decaying into a(0)(980) and a pion, during J/ψ (psi) meson decays. This finding advances understanding of particle physics and meson spectroscopy.

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Area of Science:

  • Particle Physics
  • Hadron Spectroscopy

Background:

  • The J/ψ (psi) meson is a crucial probe for studying the strong interaction.
  • Understanding the decay modes of heavy quarkonium provides insights into fundamental physics.

Purpose of the Study:

  • To investigate the decay J/ψ → ωηπ+ π-.
  • To search for and characterize new resonant states in the ηπ+ π- system.

Main Methods:

  • Analysis of a large dataset of (225.2 ± 2.8) × 10^6 J/ψ events collected by the BESIII detector.
  • Amplitude analysis of the ηπ+ π- invariant mass spectrum.

Main Results:

  • Observation of a new process J/ψ → ωX(1870) with a statistical significance of 7.2σ.
  • The X(1870) state decays into a(0)(±)(980)π±.
  • Measured properties of X(1870): mass M = 1877.3 ± 6.3(stat)(-7.4)(+3.4)(syst) MeV/c², width Γ = 57 ± 12(stat)(-4)(+19)(syst) MeV/c².
  • Product branching fraction B(J/ψ → ωX) × B(X→a(0)(±)(980)π±) × B(a(0)(±)(980) → ηπ±) = [1.50 ± 0.26(stat)(-0.36)(+0.72)] × 10⁻⁴.
  • Clear signals for J/ψ → ωf(1)(1285) and J/ψ → ω η(1405) were also observed.

Conclusions:

  • The discovery of X(1870) expands the known meson spectrum.
  • This study contributes to the ongoing efforts to understand the complex nature of quarkonium decays and exotic hadrons.