Photoproductionγp→K^(+)Λ(1690)in an effective Lagrangian approach

作     者：Neng-Chang Wei Ai-Chao Wang Fei Huang 韦能昌;王爱超;黄飞

作者机构：School of Nuclear Science and TechnologyUniversity of Chinese Academy of SciencesBeijing 101408China 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2022年第46卷第5期

页      面：44-51页

核心收录：

学科分类：08[工学] 0827[工学-核科学与技术] 082701[工学-核能科学与工程] 

基　　金：Partially supported by the National Natural Science Foundation of China(12175240,11475181,11635009) the Fundamental Research Funds for the Central Universities,the China Postdoctoral Science Foundation(2021M693141,2021M693142) the Key Research Program of Frontier Sciences of Chinese Academy of Sciences(Y7292610K1) 

主　　题：K^(+)Λ(1690)photoproduction effective Lagrangian approach gauge invariance 

摘      要：A gauge-invariant model is constructed for theγp→K^(+)Λ(1690)reaction within a tree-level effective Lagrangian approach to understand the underlying production mechanisms and study the resonance contributions in this *** addition to the t-channel K and K^(∗)exchanges,s-channel nucleon exchange,and interaction current,the s-channel nucleon resonance exchanges are included in constructing the reaction amplitudes to describe the *** is found that the contributions from the s-channel N(2570)5/2^(−)exchange are required to describe the most recently measured total cross-section data forγp→K^(+)Λ(1690)from the CLAS *** analysis indicates that the interaction current dominates the γ p→K^(+)Λ(1690)reaction near the threshold as a result of gauge *** t-channel K exchange contributes significantly,while the contributions from the t-channel K^(∗)exchange and s-channel nucleon exchange are ultimately *** contributions from the s-channel N(2570)5/2^(−)exchange are found to be responsible for the bump structure shown in the CLAS total cross-section data above the center-of-mass energy W≈2.7 *** predictions of the differential cross sections forγp→K^(+)Λ(1690)are presented and discussed,which can provide theoretical guidance for future experiments.