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arXiv 0706.3543nucl-th
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手征组分夸克模型中低能π^{-}p \to ηn的研究

Study of π^{-}p \to ηn at low energies in a chiral constituent quark model

Xian-Hui Zhong, Qiang Zhao, Jun He, Bijan Saghai

摘要:

将手征夸克模型方法推广到低能$πN$散射的研究中。研究了$π^{-}p \to ηn$在阈值附近的过程。该模型成功地描述了$η$生产阈值附近的微分截面和总截面。阐明了$n\leq 2$壳层中共振的作用。在阈值附近,$S_{11}(1535)$主导反应,而$S_{11}(1650)$的干扰在$W\lesssim 1.6$ GeV附近是破坏性的。$D_{13}(1520)$对于给出微分截面的正确形状至关重要。核子极项的贡献是显著的。$P_{11}(1710)$在c.m.周围发挥着重要作用。能量为$W=1.7$ GeV时,如总截面数据所示,在$W>1.6$ GeV区域产生增强是至关重要的。$t$ -通道在反应中可忽略不计。

英文摘要:

A chiral quark model approach is extended to the study of the $πN$ scattering at low energies. The process of $π^{-}p \to ηn$ near threshold is investigated. The model is successful in describing the differential cross sections and total cross section near the $η$ production threshold. The roles of the resonances in $n\leq 2$ shells are clarified. Near threshold, the $S_{11}(1535)$ dominates the reactions, while the interferences from the $S_{11}(1650)$ turn out to be destructive around $W\lesssim 1.6$ GeV. The $D_{13}(1520)$ is crucial to give correct shapes of the differential cross sections. The nucleon pole term contributions are significant. The $P_{11}(1710)$ plays an important role around the c.m. energy $W=1.7$ GeV, it is crucial to produce an enhancement in the region of $W>1.6$ GeV as suggested by the data for total cross section. The $t$-channel is negligible in the reactions.

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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