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University of Oklahoma, Norman, Oklahoma 73019, USA.
Phys Rev Lett. 2001 Oct 1;87(14):141801. doi: 10.1103/PhysRevLett.87.141801. Epub 2001 Sep 13.
We report on a search for the radiative decay Upsilon(1S)-->gammaeta(') in 61.3 pb(-1) of data taken with the CLEO II detector at the Cornell Electron Storage Ring. Three decay chains were investigated, all involving eta(')-->pi(+)pi(-)eta, followed by eta-->gammagamma, eta-->pi(0)pi(0)pi(0), or eta-->pi(+)pi(-)pi(0). We find no candidate events in any of the three cases and set a combined upper limit of 1.6x10(-5) at 90% C.L., significantly smaller than the previous limit. We compare our result to other radiative Upsilon decays, to radiative J/psi decays, and to theoretical predictions.
我们报告了在康奈尔电子储存环上使用CLEO II探测器采集的61.3 pb⁻¹数据中对辐射衰变Υ(1S)→γη(')的搜索。研究了三条衰变链，所有衰变链都涉及η(')→π⁺π⁻η，随后是η→γγ、η→π⁰π⁰π⁰或η→π⁺π⁻π⁰。我们在这三种情况中均未发现候选事件，并在90%置信水平下设定了1.6×10⁻⁵的组合上限，该上限显著小于先前的限制。我们将我们的结果与其他辐射Υ衰变、辐射J/ψ衰变以及理论预测进行了比较。
