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Observation of J/psi-->3gamma.

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  • 1Rensselaer Polytechnic Institute, Troy, New York 12180, USA.

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Area of Science:

  • * Particle Physics
  • * High-Energy Physics
  • * Quantum Chromodynamics

Background:

  • * The J/psi particle is a crucial probe for understanding quantum chromodynamics.
  • * Previous studies have explored various J/psi decay modes.
  • * The decay J/psi to three photons (3gamma) was theoretically predicted but experimentally unconfirmed.

Purpose of the Study:

  • * To report the first experimental observation of the J/psi --> 3gamma decay.
  • * To measure the branching fraction of this decay mode.
  • * To contribute to the understanding of rare particle decays and fundamental symmetries.

Main Methods:

  • * Analysis of J/psi --> 3gamma events collected by the CLEO-c detector.
  • * Data acquired from psi(2S) --> pi+pi-J/psi events at the CESR e+e- collider.
  • * Statistical analysis to determine signal significance and branching fraction.

Main Results:

  • * First observation of the J/psi --> 3gamma decay with a statistical significance of 6 sigma.
  • * Measured branching fraction B(J/psi --> 3gamma) = (1.2 +/- 0.3 +/- 0.2) x 10^-5.
  • * Statistical and systematic errors were carefully evaluated.

Conclusions:

  • * The observation of J/psi --> 3gamma provides direct evidence for this decay mode.
  • * The measured branching fraction offers a stringent test for theoretical models.
  • * This finding enhances our knowledge of the J/psi particle's properties and rare decays.