中国科学院大学学报2024，Vol.41Issue(1)：35-41,7.DOI:10.7523/j.ucas.2021.0042
光生反应γp→π-Δ++中的核子激发态
Nucleon resonances in γp→π-Δ++photoproduction
摘要
Abstract
The first measured high-precision data on the differential cross sections and polarization observable beam asymmetry ∑ for the γp→π-Δ++reaction from the LEPS collaboration are analyzed within a tree-level effective lagrangian approach.In addition to the t-channel π and ρ exchanges,the u-channel Δ exchange,the s-channel N exchange,and the interaction current that is required by the gauge invariance,the s-channel nucleon resonance exchanges are further taken into account to reproduce the data of LEPS.Numerical results show that,the data on ∑ can not be well reproduced when no contributions from the s-channel resonance exchanges are introduced.Further analyses show that,by including the contribution from the resonance N(1860)5/2+,both the data on the differential cross sections and beam asymmetry ∑ can be well reproduced.关键词
光生反应/核子激发态/有效拉氏量方法Key words
photoproduction reaction/nucleon resonances/effective lagrangian approach分类
数理科学引用本文复制引用
朱一鸣,杨富中..光生反应γp→π-Δ++中的核子激发态[J].中国科学院大学学报,2024,41(1):35-41,7.基金项目
国家自然科学基金(11475178)资助 （11475178）
