New Elementary Operator for Kaon Photoproduction on the Nucleon and Nuclei

IF 1.8 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Few-Body Systems Pub Date : 2026-04-06 DOI:10.1007/s00601-026-02038-7

Terry Mart, Jovan Alfian Djaja

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Abstract

A new elementary operator for kaon photoproduction on the nucleon and nuclei has been developed within a Feynman diagrammatic framework. By fitting the unknown coupling strengths at the electromagnetic and hadronic vertices of the baryon resonances to all available experimental data across the six isospin channels, the model achieves excellent agreement with the data. The operator includes 26 nucleon resonances in the \(K\Lambda \) channels and 17 additional \(\Delta \) resonances in the \(K\Sigma \) channels. For applications to nuclear reactions, such as hypernuclear photoproduction, the operator is formulated in Pauli space, allowing a straightforward implementation of the nonrelativistic approximation. Several alternative forms for expressing the operator output are proposed. In one of them, the spin operators and photon polarization vectors are separated from the operator, since both are frame dependent, thereby enhancing its versatility in nuclear applications. As an illustration of the operator’s application in the nuclear sector, we present the results for hypertriton photoproduction on \(^3\)He and compare the calculations based on the present operator with those obtained by using Kaon-Maid.

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核子和原子核上Kaon光产生的新基本算子

在费曼图解框架内，提出了一种新的在核子和原子核上产生kaon光的基本算符。通过将重子共振的电磁和强子顶点处的未知耦合强度拟合到六个同位旋通道上所有可用的实验数据中，该模型与数据具有很好的一致性。算符包括\(K\Lambda \)通道中的26个核子共振和\(K\Sigma \)通道中的17个额外的\(\Delta \)共振。对于核反应的应用，如超核光产生，算符是在泡利空间中表述的，允许非相对论近似的直接实现。提出了几种表示算子输出的替代形式。其中一种是将自旋算符和光子偏振矢量从算符中分离出来，因为它们都是坐标系相关的，从而增强了其在核应用中的通用性。为了说明该算子在核领域的应用，我们给出了在\(^3\) He上超氚光生产的结果，并将基于该算子的计算结果与使用Kaon-Maid获得的计算结果进行了比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Few-Body Systems 物理-物理：综合

CiteScore

2.90

自引率

18.80%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Few-Body Systems presents original research work – experimental, theoretical and computational – investigating the behavior of any classical or quantum system consisting of a small number of well-defined constituent structures. The focus is on the research methods, properties, and results characteristic of few-body systems. Examples of few-body systems range from few-quark states, light nuclear and hadronic systems; few-electron atomic systems and small molecules; and specific systems in condensed matter and surface physics (such as quantum dots and highly correlated trapped systems), up to and including large-scale celestial structures. Systems for which an equivalent one-body description is available or can be designed, and large systems for which specific many-body methods are needed are outside the scope of the journal. The journal is devoted to the publication of all aspects of few-body systems research and applications. While concentrating on few-body systems well-suited to rigorous solutions, the journal also encourages interdisciplinary contributions that foster common approaches and insights, introduce and benchmark the use of novel tools (e.g. machine learning) and develop relevant applications (e.g. few-body aspects in quantum technologies).