论文标题
在低能量下pion-Nucleon相互作用中的同胞素不变性测试的建议
Proposals for the test of the isospin invariance in the pion-nucleon interaction at low energy
论文作者
论文摘要
这项工作详细阐述了我们对电荷交换反应的观察结果的两组预测$π^ - p \至π^0 n $在低能（Pion实验室动能$ t \ leq 100 $ MEV）。第一个预测是通过三角形身份从拟合的结果到低能$π^\ pm p $弹性散发数据获得的，而第二个基于对合并的低能$π^+ p $和电荷exchange数据库的相同分析。假设我们拟合中使用的数据的完整性（即，在确定数据集的绝对正常化中没有显着的系统效应）以及在电磁校正中残留效应的微不足道，这两组预测之间的显着差异可能被解释为从同胞中的低不变稳定性中偏离低不变性$ $πn$πn。我们检查了标准低能观测值对效果的敏感性，并确定了实验调查有希望的运动区域。在建议条件下的准确实验将区分预测，从而对低能$πn$相互作用中的同胞不变性进行独立的测试。
This work elaborates on former remarks of ours regarding two sets of predictions for the observables of the charge-exchange reaction $π^- p \to π^0 n$ at low energy (pion laboratory kinetic energy $T \leq 100$ MeV). The first prediction is obtained via the triangle identity from the results of fits to low-energy $π^\pm p$ elastic-scattering data, whereas the second is based on the same analysis of the combined low-energy $π^+ p$ and charge-exchange databases. Assuming the integrity of the data used in our fits (i.e., the absence of significant systematic effects in the determination of the absolute normalisation of the datasets) and the insignificance of residual effects in the electromagnetic corrections, a significant difference between these two sets of predictions may be interpreted as departure from the isospin invariance in the low-energy $πN$ interaction. We examine the sensitivity of the standard low-energy observables to the effect, and identify the kinematical regions which are promising for experimental survey. Accurate experiments under the suggested conditions will differentiate between the predictions, and thus provide an independent test of the isospin invariance in the low-energy $πN$ interaction.
