arXiv 1808.027732018-08nucl-thhep-phnucl-ex

从氘靶数据中提取$γn\toπN$观测量

Extraction of $γn\toπN$ observables from deuteron-target data

Satoshi X. Nakamura

备注：: 6 pages, 5 figures. arXiv admin note: text overlap with arXiv:1804.04757; published version after minor modifications
发表信息：: Phys. Rev. C 98, 042201 (2018)
DOI：: 10.1103/PhysRevC.98.042201

摘要：

本文利用由核子和π介子交换引起的脉冲项和末态相互作用（FSI）项组成的模型，对从$d(γ,π^-)pp$和$d(γ,π^0)pn$数据中提取（非）极化$γn\to π^-p$和$γn\to π^0n$观测量的常用方法进行了研究。最近的实验和理论分析使用了一种提取方法，该方法不会对最终的$πN$不变质量$W$施加切割。我证明，使用这种方法可以导致$γn\to πN$的可观测量是严重扭曲的核子费米运动，人们可以有效地避免这个问题，通过强加一个削减$W$。它还表明，最近的实验分析的运动学切割的使用仍然可以在所选的样品中留下大量的FSI效应，必须在提取的$γn \toπN$横截面进行校正。在核子和π介子交换机制方面，我给出了第一个定性解释的FSI修正，在最近的MAMI实验中获得的，用于提取$γn\to π^0 n$截面。

英文摘要：

An examination is conducted on a commonly used procedure for extracting (un)polarized $γn\to π^-p$ and $γn\to π^0n$ observables from $d(γ,π^-)pp$ and $d(γ,π^0)pn$ data, using a model that consists of the impulse term and the final-state interaction (FSI) terms due to nucleon- and pion-exchange. Recent experimental and theoretical analyses used an extraction method that does not impose a cut on the final $πN$ invariant mass $W$. I demonstrate that the use of this method can result in the $γn\to πN$ observables that are seriously distorted by the nucleon Fermi motion, and that one can efficiently avoid this problem by imposing a cut on $W$. It is also shown that the use of kinematical cuts of recent experimental analyses can still leave in the selected samples substantial FSI effects that must be corrected in extracting the $γn \toπN$ cross sections. In terms of the nucleon- and pion-exchange mechanisms, I give the first qualitative explanation of the FSI corrections, obtained in a recent MAMI experiment, for extracting $γn\to π^0 n$ cross sections.

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