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Dalitz analysis of D0-->K(0)(S)pi(+)pi(-).

H Muramatsu1, S J Richichi, H Severini

  • 1University of Oklahoma, Norman 73019, USA.

Physical Review Letters
|December 18, 2002
PubMed
Summary

Researchers studied D0 meson decays into K(0)(S)pi(+)pi(-) using the CLEO detector. They observed ten contributions, including a K(*)(892)(+)pi(-) component, potentially from doubly Cabibbo suppressed decays or D0-D0 mixing.

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Chromodynamics

Background:

  • The D0 meson is a key probe for studying fundamental symmetries in particle physics.
  • Understanding D0 meson decays provides insights into the weak interaction and potential new physics beyond the Standard Model.
  • The CLEO detector has been instrumental in precision measurements of charm and bottom meson properties.

Purpose of the Study:

  • To analyze the resonant substructure of the D0 to K(0)(S)pi(+)pi(-) decay.
  • To identify and quantify different contributing amplitudes and their relative phases in the decay.
  • To investigate the origin of the K(*)(892)(+)pi(-) component, exploring possibilities of doubly Cabibbo suppressed decays or D0-D0 mixing.

Main Methods:

  • Utilizing data from e(+)e(-) collisions collected by the CLEO detector.
  • Employing the Dalitz technique to map the phase space of the three-body decay.
  • Performing a multi-component amplitude fit to extract resonant contributions and their parameters.

Main Results:

  • Successfully identified and characterized ten distinct resonant contributions within the D0 --> K(0)(S)pi(+)pi(-) decay.
  • Observed a significant K(*)(892)(+)pi(-) contribution.
  • The analysis provides precise measurements of amplitudes and phases for the various decay channels.

Conclusions:

  • The detailed substructure analysis of the D0 --> K(0)(S)pi(+)pi(-) decay offers a rich landscape for exploring fundamental symmetries.
  • The observation of the K(*)(892)(+)pi(-) component supports theoretical expectations for doubly Cabibbo suppressed processes or D0-D0 mixing.
  • These findings contribute to a more comprehensive understanding of heavy quark decays and the underlying physics.