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Related Experiment Videos

First measurement of gamma(D*(+)).

S Ahmed1, M S Alam, S B Athar

  • 1State University of New York at Albany, Albany, New York 12222, USA.

Physical Review Letters
|December 12, 2001
PubMed

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Summary

This study reports the first measurement of the D*(+) meson width, a key property in particle physics. Researchers determined the width to be 96+/-4 (stat)+/-22 (syst) keV using advanced techniques.

Area of Science:

  • High Energy Physics
  • Particle Physics
  • Hadron Spectroscopy

Background:

  • The D*(+) meson is an important excited state of charm mesons.
  • Precise knowledge of its width is crucial for understanding strong interaction dynamics.
  • Previous measurements of the D*(+) width were limited in precision.

Purpose of the Study:

  • To present the first measurement of the D*(+) meson width.
  • To accurately determine the energy release in the D*(+)-->D(0)pi(+) decay.
  • To compute the mass difference between the D*(+) and D(0) mesons.

Main Methods:

  • Utilized 9/fb of e(+)e(-) collision data near the Upsilon(4S) resonance.
  • Employed advanced tracking and reconstruction techniques with the CLEO II.V detector.

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  • Leveraged the small vertical beam spot size at the Cornell Electron-positron Storage Ring for precise measurements.

    • Main Results:

    • Measured the D*(+) width as gamma(D*(+)) = 96+/-4 (stat)+/-22 (syst) keV.
    • Determined the energy release in the D*(+)-->D(0)pi(+) decay.
    • Calculated the mass difference Delta m = m(D*(+))-m(D(0)) = 145.412+/-0.002 (stat)+/-0.012 (syst) MeV/c(2).

    Conclusions:

    • This study provides the first precise measurement of the D*(+) width.
    • The results offer valuable data for refining theoretical models of hadron spectroscopy.
    • The precise mass difference measurement further constrains charm meson properties.