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A study of the radiative CASCADE transitions between the Upsilon-Prime and Upsilon resonances

Apr, 1986
133 pages
Supervisor:
  • K. Rybiki
Thesis: PhD
  • Cracow, INP
(1986)
Report number:
  • DESY-F31-86-02,
  • DESY-F-31-86-02
Experiments:
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Abstract:
The cascade reaction e+e−→Υ′→γXb→γγΥ→γγ(μ+μ−e^+e^- \to \Upsilon' \to \gamma X_b \to \gamma \gamma \Upsilon \to \gamma \gamma (\mu^+ \mu^- or e+e−)e^+e^-) has been studied with the Crystal Ball detector at the e+e−e^+e^- storage ring DORIS-II. Two xbx_b states are observed by monoenergetic photon lines at 107.7 ± 1.1 ± 1.0 MeV and 132.4 ± 0.9 ± 1.0 MeV, with amplitudes of 56 ± 6 and 82 ± 10 events correspondingly. Upper limits for full widths of those states at 90 % confidence level are < 6.2 MeV and < 6.9 MeV respectively...
  • THESIS
  • ELECTRON POSITRON: ANNIHILATION
  • ANNIHILATION: ELECTRON POSITRON
  • UPSILON(10020): ELECTROPRODUCTION
  • ELECTROPRODUCTION: UPSILON(10020)
  • UPSILON(10020): RADIATIVE DECAY
  • RADIATIVE DECAY: UPSILON(10020)
  • UPSILON(10020): CASCADE DECAY
  • CASCADE DECAY: UPSILON(10020)
  • CHI MESONS: bottom
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