| Fast computation of observed cross section for ψ′ → PP decays |
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| 作者姓名： | 王博群 莫晓虎 王平 班勇 |
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| 作者单位： | - School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
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| 基金项目： | National Natural Science Foundation of China，In- strument Developing Project of Chinese Academy of Sciences，Major State Basic Research Development Program，Knowledge Innovation Project of Chinese Academy of Sciences |
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| 摘 要： | 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 ...
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| 关 键 词： | 计算时间 截面 衰变 聚丙烯 解析表达式 线性回归方法 粲夸克偶素 相对相位 |
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