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J/psi and psi(2S) Radiative Transitions to eta_{c}.

R E Mitchell1, M R Shepherd, D Besson

  • 1Indiana University, Bloomington, Indiana 47405, USA.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

This study presents the most precise measurements of magnetic dipole transitions in the charmonium system, including the psi(2S) to gamma eta_c decay. Findings reveal an eta_c line shape distortion, impacting mass measurements.

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Area of Science:

  • Particle Physics
  • Quantum Chromodynamics
  • High-Energy Physics

Background:

  • The charmonium system, composed of a charm quark and antiquark, is a crucial testing ground for Quantum Chromodynamics.
  • Understanding magnetic dipole transitions within charmonium provides insights into fundamental particle interactions.
  • Previous measurements of eta_c mass have shown discrepancies depending on production mechanisms.

Purpose of the Study:

  • To provide the most precise measurements of magnetic dipole transitions in the charmonium system.
  • To investigate the line shape of the eta_c meson and its dependence on photon energy.
  • To resolve discrepancies in eta_c mass measurements by analyzing radiative transitions.

Main Methods:

  • Analysis of 2.45x10^7 psi(2S) decays collected by the CLEO-c detector.
  • Precise measurement of branching ratios for psi(2S) --> gamma eta_c and J/psi --> gamma eta_c.
  • Examination of the eta_c line shape and its photon-energy dependence.

Main Results:

  • Measured B(psi(2S)-->gammaeta_{c})=(4.32+/-0.16+/-0.60)x10^{-3}.
  • Determined B(J/psi-->gammaeta_{c})/B(psi(2S)-->gammaeta_{c})=4.59+/-0.23+/-0.64.
  • Measured B(J/psi-->gammaeta_{c})=(1.98+/-0.09+/-0.30)%.
  • Observed a significant distortion in the eta_c line shape due to transition rate's photon-energy dependence.

Conclusions:

  • The observed eta_c line shape distortion is sensitive to the eta_c mass measurements.
  • This finding offers a potential explanation for the discrepancy in eta_c mass measurements between radiative transitions and other production methods.
  • The precise branching ratio measurements contribute significantly to the understanding of charmonium physics.