$$\phi $$ Meson Photoproduction on the Nucleon and $${}^4$$ He Targets

IF 1.7 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Few-Body Systems Pub Date : 2024-03-10 DOI:10.1007/s00601-024-01894-5

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Abstract

We study the reaction mechanism of $\phi $ -meson photoproduction on the nucleon and ${}^4$ He targets by using a dynamical model based on a Hamiltonian. In addition to the dominant contribution of the Pomeron exchange, various meson exchanges are considered in the t channel to describe the CLAS data in the low energy region ${\sqrt{s}} = (1.97 - 2.84)$ GeV. The direct $\phi $ radiations are taken into account in the s- and u-channels. The backward structures at ${\sqrt{s}} \approx 2.1$ and 2.3 GeV are well reproduced by the inclusion of the s-channel $N(2000,5/2^+)$ and $N(2300,1/2^+)$ resonances, respectively. We also consider the final $\phi N$ interactions by the gluon exchange, the direct $\phi N$ interactions, and the box diagrams arising from the couplings with the $\pi N$ , $\rho N$ , $K \Lambda $ , and $K \Sigma $ channels. The effects of the final state interactions are found to be very weak. Then the resulting Hamiltonian is used to study the coherent $\gamma {}^4{\textrm{He}} \rightarrow \phi {}^4{\textrm{He}}$ reaction within the distorted-weave impulse approximation. The calculated differential cross sections account for the LEPS data quite well.

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核子和 $${}^4$$ He 靶上的 $$\phi $$ 介子光生产

摘要我们利用基于哈密顿的动力学模型研究了核子和（{}^4）He目标上的（\phi \）介子光生成反应机制。除了波美子交换的主要贡献之外，还考虑了 t 频道中的各种介子交换，以描述低能区 ${\sqrt{s}} = (1.97 - 2.84)$ 的 CLAS 数据。 GeV.在s和u通道中考虑了直接辐射。通过包含s通道的（N(2000,5/2^+)）和（N(2300,1/2^+)）共振，分别很好地再现了2.3 GeV和2.3 GeV的后向结构。我们还考虑了通过胶子交换产生的最终态相互作用、直接态相互作用，以及由与$\pi N$ 、$\rho N$ 、$K\Lambda N$ 和$K\Sigma N$ 信道耦合产生的盒图。最终状态相互作用的影响非常微弱。然后，得到的哈密顿方程被用来研究扭曲波脉冲近似中的相干(\gamma {}^4{\textrm{He}} \rightarrow \phi {}^4{\textrm{He}}\) 反应。计算出的差分截面很好地解释了LEPS数据。

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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).