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It has been conjectured that the relative phase between strong and electromagnetic amplitudes is universally -90° in charmonium decays. ψ′ decaying into a pseudoscalar pair provides a possibility to test this conjecture. However, the experimentally observed cross section for such a process is depicted by the two-fold integral, which takes into account the initial state radiative (ISR) correction and energy spread effect. Using the generalized linear regression approach, a complex energy-dependent factor is ... 相似文献
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One resistive plate chamber made of Chinese materials and one Italian resistive plate chamber have been tested in the Gamma
Irradiation Facility (GIF) at CERN on a high intensity muon beam together with a137Cs source to give a uniform photon background, and simulating conditions close to those expected for an LHC muon detector.
The results are analyzed. Good space and time resolutions are obtained which satisfy the future CMS experiment requirements.
The detection efficiency is different between two RPCs against a high irradiation background. The reason is discussed. 相似文献
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北京正负电子对撞机上的BES实验为系统地进行重子谱研究提供了一个很好的舞台,由于很多待研究的衰变道末态为多个小动量的粒子,给探测和分析带来困难.本工作以通过衰变道J/ψ→[I]^*∧K^-研究激发态为例,比较了不同模型的蒙特卡罗模拟,并结合实验数据,分析了该类型重子谱研究的探测限及产生子和探测器模拟对结果的影响。 相似文献