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Nucleon resonances in gamma p - K*(+) Lambda

机译:γp - &gt中的核仁共振; K *(+)λ

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摘要

The high-precision cross section data for the reaction gamma p - K*(+) Lambda reported by the CLAS Collaboration at the Thomas Jefferson National Accelerator Facility have been analyzed based on an effective Lagrangian approach in the tree-level approximation. Apart from the t-channel K, kappa, K* exchanges, the s-channel nucleon (N) exchange, the u-channel Lambda, Sigma, Sigma*(1385) exchanges, and the generalized contact term, the contributions from the near-threshold nucleon resonances in the s channel are also taken into account in constructing the reaction amplitude. It is found that to achieve a satisfactory description of the differential cross section data, at least two nucleon resonances should be included. By including the N(2060)5/2(-) resonance, which is responsible for the shape of the angular distribution near the K* Lambda threshold, and one of the N(2000) 5/2(+), N(2040)3/2(+), N(2100)1/2(+), N(2120)3/2(-) and N(2190)7/2(-) resonances, one can describe the cross section data quite well, with the fitted resonance masses and widths compatible with those advocated by the Particle Data Group. The resulted predictions of the beam, target, and recoil asymmetries are found to be quite different from various fits, indicating the necessity of the spin observable data for gamma p - K*(+) Lambda to further pin down the resonance contents and associated parameters in this reaction.
机译:反应γp - &gt的高精度横截面数据。 K *(+)CLAS在Thomas Jefferson国家加速设施报告的Lambda已经基于树级近似的有效拉格朗日方法进行了分析。除了T-Channel K,Kappa,K *交换,S渠道核子(N)交换,U-Channel Lambda,Sigma,Sigma *(1385)交易所和广义联系期,来自附近的贡献在构建反应幅度时也考虑了S通道中的核核聚物共振。发现,为了实现差分横截面数据的令人满意的描述,应包括至少两个核聚核结构共振。通过包括n(2060)5/2( - )谐振,其负责k * lambda阈值附近的角分布的形状,并且N(2000)5/2(+),n(2040) )3/2(+),n(2100)1/2(+),n(2120)3/2( - )和n(2190)7/2( - )共振,可以描述横截面数据嗯,拟合的共振质量和宽度与粒子数据组主张的宽度兼容。被产生的光束,靶和再压非对称的预测与各种配合有很大差异,表明γp-&gt的旋转可观察数据的必要性。 K *(+)Lambda进一步放下该反应中的共振内容物和相关参数。

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  • 来源
    《Physical review, C》 |2017年第3期|共15页
  • 作者单位

    Univ Chinese Acad Sci Sch Phys Sci Beijing 101408 Peoples R China;

    Beihang Univ Sch Phys &

    Nucl Energy Engn Beijing 100191 Peoples R China;

    Univ Chinese Acad Sci Sch Phys Sci Beijing 101408 Peoples R China;

    George Washington Univ Inst Nucl Studies Washington DC 20052 USA;

    Univ Georgia Dept Phys &

    Astron Athens GA 30602 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
  • 关键词

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