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Measurement of the near-threshold e+e- --> D()+/-D()-/+ cross section using initial-state radiation.

G Pakhlova¹, K Abe, I Adachi

¹Institute for Theoretical and Experimental Physics, Moscow.

Physical Review Letters

|March 16, 2007

Summary

Researchers measured the exclusive cross section for electron-positron annihilation into charged D-meson pairs near their production threshold. This study provides crucial data for understanding particle physics processes and refining theoretical models.

Area of Science:

High-energy particle physics
Quantum chromodynamics
Experimental particle physics

Background:

Understanding the behavior of mesons is crucial for particle physics.
The D(*)+/-D*-/+ system provides a unique laboratory to study strong interaction dynamics.
Previous measurements have limited precision near the threshold.

Purpose of the Study:

To precisely measure the exclusive e+e- -->D(*)+/-D*-/+ cross section near the threshold.
To investigate the effects of initial-state radiation on the cross section.
To improve the understanding of D-meson pair production mechanisms.

Main Methods:

Utilized a partial reconstruction technique for enhanced efficiency and background suppression.
Analyzed a large dataset collected by the Belle detector.
Performed measurements as a function of center-of-mass energy.

Main Results:

Reported the exclusive cross section for e+e- -->D(*)+/-D*-/+.
Characterized the energy dependence of the cross section near the D(*)+/-D*-/+ threshold.
Demonstrated the effectiveness of the partial reconstruction technique.

Conclusions:

The measurement provides valuable data for testing theoretical predictions in particle physics.
The study contributes to a better understanding of heavy meson spectroscopy and interactions.
Further theoretical work is needed to fully interpret the observed cross section behavior.

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