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Related Experiment Videos

e+ e- annihilation into J/psi + J/psi.

Geoffrey T Bodwin1, Jungil Lee, Eric Braaten

  • 1High Energy Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.

Physical Review Letters
|May 7, 2003
PubMed
Summary

The Belle Collaboration observed discrepancies in charmonium production during electron-positron annihilation. A proposed explanation involves the J/psi+J/psi process, potentially explaining the observed differences from theoretical predictions.

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Area of Science:

  • High-energy physics
  • Quantum chromodynamics
  • Particle physics

Background:

  • Recent measurements by the Belle Collaboration show significant deviations between exclusive two-charmonium production in electron-positron annihilation and theoretical predictions.
  • Existing theoretical frameworks may not fully account for all contributing processes in these high-energy collisions.

Purpose of the Study:

  • To investigate the discrepancy observed in Belle Collaboration's measurements of exclusive two-charmonium production.
  • To propose and evaluate the J/psi+J/psi production process as a significant contributor to the observed discrepancy.

Main Methods:

  • Analysis of electron-positron annihilation data.
  • Theoretical modeling of charmonium production mechanisms, specifically focusing on J/psi+J/psi and J/psi+eta(c) final states.

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  • Comparison of predicted cross sections with experimental measurements.

    • Main Results:

    • The J/psi+J/psi production process, proceeding via fragmentation of two virtual photons into cc pairs, is suggested as a key factor.
    • The cross section for J/psi+J/psi production may be approximately 3.7 times larger than that for J/psi+eta(c).
    • This explanation accounts for the discrepancy despite a suppression factor related to QED and QCD coupling constants.

    Conclusions:

    • The J/psi+J/psi production mechanism offers a plausible explanation for the observed discrepancies in exclusive two-charmonium production at Belle.
    • Further theoretical and experimental investigations are warranted to confirm the role of this process in electron-positron annihilation.