Pion-nucleon sigma term σπN and deeply bound pionic atoms
Pion-nucleon sigma term σπN and deeply bound pionic atoms
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π-核子西格玛项 σπN 和深度束缚的π原子
DOI：
10.1093/ptep/ptad031
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发表时间：
2023
影响因子：
3.5
通讯作者：
Hirenzaki Satoru
中科院分区：
文献类型：
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作者：
Ikeno Natsumi;Nishi Takahiro;Itahashi Kenta;Nose-Togawa Naoko;Tani Akari;Hirenzaki Satoru
本文研究了由深束缚的π原子的实验观测值精确确定π-核子σ项σπ N的可能性。我们讨论了观测量对σπ N的敏感性，并考虑了深束缚π原子的最新实验的典型误差。我们发现结合能的差距和深束缚的π介子态的宽度是用实验数据确定σπ N值的很好的观测量。本文还讨论了由于π-核光学势中σ项与势参数的相关性，给精确确定σπ N值带来的困难。
We investigate the possibility of determining the value of the pion–nucleon sigma term σπNprecisely by the experimental observables of deeply bound pionic atoms. We discuss the sensitivity of the observables to σπNand take into account the typical errors of up-to-date experiments on deeply bound pionic atoms. We find that the gap in the binding energies and the width of the deeply bound pionic states are good observables for σπNvalue determination with experimental data. We also discuss the expected difficulties for the accurate determination of the value of σπNdue to the correlation between the σ term and the potential parameter in the pion–nucleus optical potential.