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arXiv 2204.09211nucl-thnucl-ex
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π-核子σ项$σ_{πN}$和深束缚π原子

Pion-nucleon sigma term $σ_{πN}$ and deeply bound pionic atoms

Natsumi Ikeno, Takahiro Nishi, Kenta Itahashi, Naoko Nose-Togawa, Akari Tani, Satoru Hirenzaki

摘要:

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$σ_{πN}$的可能性。我们讨论了观测量对$σ_{πN}$的敏感性,并考虑到深束缚的原子的最新实验的典型误差。我们发现,结合能的间隙和深束缚的π介子态的宽度是很好的观测值的$σ_{πN}$值确定的实验数据。我们还讨论了由于$σ$项与π-核光学势中的势参数之间的相关性而给精确确定$σ_{πN}$值带来的困难。

英文摘要:

We investigate the possibility to determine the value of the pion-nucleon sigma term $σ_{πN}$ precisely by the experimental observables of the deeply bound pionic atoms. We discuss the sensitivity of the observables to $σ_{πN}$ and take into account the typical errors of the up-to-date experiments of the deeply bound pionic atoms. We find that the gap of the binding energies and the width of the deeply bound pionic states are good observables for the $σ_{πN}$ value determination by the experimental data. We also discuss the expected difficulties for the accurate determination of the value of $σ_{πN}$ due to the correlation between the $σ$ term and the potential parameter in the pion-nucleus optical potential.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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