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arXiv 1209.4138nucl-thhep-exhep-lathep-phnucl-ex
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核子共振在$Λ$（1520）质子光生中的作用

The roles of nucleon resonances in $Λ$(1520) photoproduciton off proton

Jun He, Xu-Rong Chen

备注：
9 pages, 8 figures, 3 Tables, accepted by Phys. Rev. C
发表信息：
Phys.Rev. C86 (2012) 035204
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摘要：

本文用有效拉格朗日方法研究了质子靶外光生$Λ$（1520）中核子共振的作用。除了玻恩项，包括接触项，$s$ -，$u$ -和$K$交换的$t$ -通道外，我们还考虑了矢量介子$K^*$交换的$t-$通道，它在低能时可以忽略，在高能时很重要.考虑了组分夸克模型（CQM）预测的重要核子共振态，结果与实验数据符合得很好。除了占主导地位的$D_{13}(2080)$，共振$[\textstyle{5\over 2}^-]_2(2080)$预测的CQM被发现是重要的再现实验数据。其他核子共振被发现在这项工作中考虑的通道中的贡献很小。利用CQM预测的所有重要核子共振，给出了能量高达5.5GeV的微分截面的预测，这可以用未来的CLAS实验数据来检验。

英文摘要：

In this work the roles of the nucleon resonances in the $Λ$(1520) photoproduction off proton target are investigated within the effective Lagrangian method. Besides the Born terms,including contact term, $s$-, $u$- and $K$ exchanged $t$-channels, vector meson $K^*$ exchanged $t-$channel is considered in our investigation, which is negligible at low energy and important at high energy. The important nucleon resonances predicted by the constituent quark model (CQM) are considered and the results are found well comparable with the experimental data. Besides the dominant $D_{13}(2080)$, the resonance $[\textstyle{5\over 2}^-]_2(2080)$ predicted by the CQM is found important to reproduce the experimental data. Other nucleon resonances are found to give small contributions in the channel considered in this work. With all important nucleon resonances predicted by CQM, the prediction of the differential cross section at the energy up to 5.5 GeV are presented also, which can be checked by the future CLAS experimental data.

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