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Search for the decay upsilon(1S) --> gammaeta(').

S J Richichi1, H Severini, P Skubic

  • 1University of Oklahoma, Norman, Oklahoma 73019, USA.

Physical Review Letters
|October 3, 2001
PubMed

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Summary
This summary is machine-generated.

Researchers searched for the radiative decay Upsilon(1S) to gamma eta prime. No events were observed, setting a new upper limit for this rare particle decay.

Area of Science:

  • Particle Physics
  • High Energy Physics
  • Experimental Physics

Background:

  • Radiative decays of heavy quarkonia, such as Upsilon(1S), provide insights into fundamental interactions.
  • Previous searches for Upsilon(1S) --> gamma eta prime have established upper limits on its branching fraction.

Purpose of the Study:

  • To search for the radiative decay Upsilon(1S) --> gamma eta prime.
  • To set a new, more stringent upper limit on the branching fraction of this decay.
  • To compare the findings with other radiative Upsilon and J/psi decays and theoretical predictions.

Main Methods:

  • Analysis of 61.3 pb(-1) of data collected by the CLEO II detector at the Cornell Electron Storage Ring.
  • Investigation of three distinct decay chains involving eta prime --> pi(+)pi(-)eta and subsequent eta decays (eta --> gamma gamma, eta --> pi(0)pi(0)pi(0), or eta --> pi(+)pi(-)pi(0)).

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Main Results:

  • No candidate events were observed for the Upsilon(1S) --> gamma eta prime decay in any of the investigated channels.
  • A combined upper limit of 1.6x10(-5) at 90% confidence level was established for the branching fraction.
  • This new limit is significantly lower than previously reported limits.

Conclusions:

  • The search places stringent constraints on the Upsilon(1S) --> gamma eta prime decay.
  • The results contribute to the understanding of radiative transitions in heavy quarkonia.
  • Comparison with theoretical models and other radiative decays will help refine our knowledge of particle physics.