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Researchers observed a new decay mode for the X(3872) particle, X(3872)→π⁰χc1, using electron-positron collision data. This finding advances our understanding of exotic hadron physics.

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Area of Science:

  • * Particle Physics
  • * Hadron Spectroscopy
  • * Quantum Chromodynamics

Background:

  • * The X(3872) is an exotic hadron whose internal structure is still debated.
  • * Understanding its decay modes provides crucial insights into its nature.
  • * Previous studies have identified several decay channels, but new ones are essential for a complete picture.

Purpose of the Study:

  • * To search for the decay of the X(3872) particle into a π⁰ meson and a χcJ (J=0, 1, 2) charmonium state.
  • * To report the first observation of the X(3872)→π⁰χc1 decay.
  • * To measure the ratio of branching fractions for X(3872)→π⁰χc1 relative to the known decay X(3872)→π⁺π⁻J/ψ.

Main Methods:

  • * Analysis of 9.0 fb⁻¹ of e⁺e⁻ collision data collected by the BESIII detector at center-of-mass energies between 4.15 and 4.30 GeV.
  • * Searching for the processes e⁺e⁻→γX(3872) followed by X(3872)→π⁰χcJ.
  • * Statistical analysis to establish the significance of observed decays and set upper limits.

Main Results:

  • * First observation of the decay X(3872)→π⁰χc1 with a statistical significance exceeding 5σ.
  • * Measured the ratio B(X(3872)→π⁰χc1)/B(X(3872)→π⁺π⁻J/ψ) = 0.88 ± 0.27 (stat) ± 0.10 (syst).
  • * Set 90% confidence level upper limits for the ratios of decays to π⁰χc0 and π⁰χc2.

Conclusions:

  • * The observation of X(3872)→π⁰χc1 provides a new, significant decay channel for the X(3872) particle.
  • * This finding contributes to the ongoing efforts to determine the composition and properties of exotic hadrons.
  • * Further theoretical and experimental studies are needed to fully understand the implications of this new decay mode.