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arXiv 0802.3816nucl-th
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用手征组分夸克模型研究质子光生$η$

Study of $η$ photoproduction on the proton in a chiral constituent quark approach via one-gluon-exchange model

Jun He, B. Saghai, Zhenping Li

摘要:

基于手征夸克模型($χ$ QM)的方法补充了一个胶子交换模型,考虑到$SU(6)\otimes O(3)$对称性的崩溃的形式主义,提出。导出了核子和共振态波函数的组态混合。%与几个可调参数,微分截面和偏振束的不对称性的$γp \to ηp$过程的计算和成功地比较与数据的质心能量范围从阈值到2 GeV。发现已知的共振$S_{11}(1535)$、$S_{11}(1650)$、$P_{13}(1720)$、$D_{13}(1520)$和$F_{15}(1680)$以及两个新的$S_{11}$和$D_{15}$共振在反应机理中占主导地位。此外,建立了$χ$ QM方法的散射振幅与螺旋度振幅以及共振衰减宽度之间的联系。可能的贡献,从所谓的“失踪的共振”的调查,发现可以忽略不计。

英文摘要:

A formalism based on a chiral quark model ($χ$QM) approach complemented with a one-gluon exchange model, to take into account the breakdown of the $SU(6)\otimes O(3)$ symmetry, is presented. The configuration mixing of wave functions for nucleon and resonances are derived. % With few adjustable parameters, differential cross-section and polarized beam asymmetry for the $γp \to ηp$ process are calculated and successfully compared with the data in the centre-of-mass energy range from threshold up to 2 GeV. The known resonances $S_{11}(1535)$, $S_{11}(1650)$, $P_{13}(1720)$, $D_{13}(1520)$, and $F_{15}(1680)$, as well as two new $S_{11}$ and $D_{15}$ resonances are found to be dominant in the reaction mechanism. Besides, connections among the scattering amplitudes of the $χ$QM approach and the helicity amplitudes, as well as decay widths of resonances are established. Possible contributions from the so-called "missing resonances" are investigated and found to be negligible.

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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