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arXiv 0704.3101hep-ph
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一个新的非奇异五夸克态候选者:N*(1675)

A new candidate for non-strangeness pentaquarks: N*(1675)

Seung-il Nam, Ki-Seok Choi, Atsushi Hosaka, Hyun-Chul Kim

摘要:

我们研究了一个新的核子共振从eta光生,这是观察到的sqrt{s}=1675 MeV的窄衰减宽度(~10 MeV)的东北LNS组以及GRAAL合作。使用一个有效的拉格朗日方法,我们计算的微分截面的eta光。除了N ~*(1675,1/2+-,3/2+-)外,我们还采用了N ~*(1520,1535,1650,1675,1710,1720)和矢量介子交换这六种与反应过程最相关的核子共振。结果表明,我们可以很好地再现GRAAL数据,并观察到N*(1675):mu_{gamma nn*} mu_{gamma pp*}跃迁磁矩之间明显的同位旋不对称性,这表明新发现的核子共振可能是一个非奇异的五夸克态.

英文摘要:

We study a new nucleon resonance from eta photoproduction, which was observed at sqrt{s}=1675 MeV with a narrow decay width (~10 MeV) by the Tohoku LNS group as well as the GRAAL collaboration. Using an effective Lagrangian approach, we compute differential cross sections for the eta photoproduction. In addition to N*(1675,1/2+-,3/2+-), we employ six other nucleon resonances, i.e. N*(1520,1535,1650,1675,1710,1720) and vector meson exchanges which are the most relevant ones to this reaction process. As a result, we can reproduce the GRAAL data qualitatively well and observe obvious isospin asymmetry between the transition magnetic moments of N*(1675): mu_{gamma nn*} >> mu_{gamma pp*}, which indicates that the newly found nucleon resonance may be identified as a non-strange pentaquark state.

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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