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arXiv 1007.3141nucl-thhep-exhep-phnucl-ex
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$N^*(2080)$共振在$\vecγ p \to K^+ Λ(1520)$反应中的作用

The role of the $N^*(2080)$ resonance in the $\vecγ p \to K^+ Λ(1520)$ reaction

Ju-Jun Xie, J. Nieves

摘要:

本文用有效拉格朗日方法研究了阈值附近$\vecγ p \to K^+ Λ(1520)$反应中$Λ(1520)$的光生过程。除了“背景”的贡献,从接触,$t-$通道$K$交换,和$s-$通道核子极条款,这已经被认为是在以前的工作中,贡献的核子共振$N^*(2080)$(自旋宇称$J^P = 3/2^-$)也被认为是。我们表明,包括核子共振$N^*(2080)$导致一个相当好的描述新的LEPS微分截面数据,这些测量可以用来确定后者的共振的一些属性。然而,当模型的预测与LEPS合作组织测量的光子束不对称性进行比较时,出现了严重的差异。

英文摘要:

We investigate the $Λ(1520)$ photo-production in the $\vecγ p \to K^+ Λ(1520)$ reaction within the effective Lagrangian method near threshold. In addition to the "background" contributions from the contact, $t-$channel $K$ exchange, and $s-$channel nucleon pole terms, which were already considered in previous works, the contribution from the nucleon resonance $N^*(2080)$ (spin-parity $J^P = 3/2^-$) is also considered. We show that the inclusion of the nucleon resonance $N^*(2080)$ leads to a fairly good description of the new LEPS differential cross section data, and that these measurements can be used to determine some of the properties of this latter resonance. However, serious discrepancies appear when the predictions of the model are compared to the photon-beam asymmetry also measured by the LEPS Collaboration.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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