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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Observation of the psi(4415)-->DD2*(2460) decay using initial-state radiation.

G Pakhlova¹, I Adachi, H Aihara

¹Institute for Theoretical and Experimental Physics, Moscow.

Physical Review Letters

|March 21, 2008

Summary

Researchers measured electron-positron collisions producing D0, D-, and pi+ mesons. They observed the psi(4415) particle decaying into these mesons, primarily through a resonant substructure.

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Area of Science:

High Energy Physics
Particle Physics
Quantum Chromodynamics

Background:

Understanding the properties and decays of heavy quarkonium states is crucial for testing Quantum Chromodynamics.
Previous studies have explored various charmonium resonances, but the decay modes of higher mass states require further investigation.

Purpose of the Study:

To measure the exclusive cross section for the process e(+)e(-)-->D(0)D(-)pi(+) in a specific energy range.
To report the first observation of the psi(4415) particle decaying into D(0)D(-)pi(+).
To analyze the resonant substructure of the psi(4415)-->D(0)D(-)pi(+) decay.

Main Methods:

Data analysis of electron-positron collision events collected by the Belle detector.
Measurement of the exclusive cross section over the center-of-mass energy range of 4.0 GeV to 5.0 GeV.
Study of the resonant substructure within the psi(4415) decay using a data sample with an integrated luminosity of 673 fb(-1).

Main Results:

Measurements of the exclusive cross section for e(+)e(-)-->D(0)D(-)pi(+) were performed.
The decay psi(4415)-->D(0)D(-)pi(+) was observed for the first time.
The decay is dominated by the channel psi(4415)-->DD(2)(*)(2460).
An upper limit on the nonresonant contribution was established: B(psi(4415)-->D(0)D(-)pi(nonresonant)(+))/B(psi(4415)-->DD(2)(*)(2460)-->D(0)D(-)pi(+))<0.22 at 90% confidence level.

Conclusions:

The study provides crucial information on the decay properties of the psi(4415) resonance.
The dominance of the DD(2)(*)(2460) intermediate state in psi(4415) decay is established.
These findings contribute to a deeper understanding of charmonium spectroscopy and decay dynamics.