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arXiv 0804.3476nucl-th
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$π^{-}p \to ηn$过程的耦合通道研究

Coupled-channels study of the $π^{-}p \to ηn$ process

J. Durand, B. Juliá-Díaz, T. -S. H. Lee, B. Saghai, T. Sato

摘要:

在核子共振区介子产生反应的动力学耦合通道模型中研究了反应$π^{-}p \to ηn$。介子重子通道包括$πN$、$ηN$、$πΔ$、$σN$和$ρN$。用么正变换方法从一组拉格朗日量导出了模型的非共振介子-重子相互作用。在每个$S$、$P$、$D$和$F$分波中包括一个或两个激发核子态以产生共振振幅。本文满意地再现了$π^{-}p \to ηn$反应从阈能到总质心能量约为2GeV的数据,并研究了下列九种核子共振所起的作用:$S_{11}(1535)$,$S_{11}(1650)$,$P_{11}(1440)$,$P_{11}(1710)$,$P_{13}(1720)$,$D_{13}(1520)$,$D_{13}(1700)$,$D_{15}(1675)$和$F_{15}(1680)$ .反应机理以及预测的$ηN$散射长度进行了讨论。

英文摘要:

The reaction $π^{-}p \to ηn$ is investigated within a dynamical coupled-channels model of meson production reactions in the nucleon resonance region. The meson baryon channels included are $πN$, $ηN$, $πΔ$, $σN$, and $ρN$. The non-resonant meson-baryon interactions of the model are derived from a set of Lagrangians by using a unitary transformation method. One or two excited nucleon states in each of $S$, $P$, $D$, and $F$ partial waves are included to generate the resonant amplitudes. Data of $π^{-}p \to ηn$ reaction from threshold up to a total center-of-mass energy of about 2 GeV are satisfactorily reproduced and the roles played by the following nine nucleon resonances are investigated: $S_{11}(1535)$, $S_{11}(1650)$, $P_{11}(1440)$, $P_{11}(1710)$, $P_{13}(1720)$, $D_{13}(1520)$, $D_{13}(1700)$, $D_{15}(1675)$, and $F_{15}(1680)$. The reaction mechanism as well as the predicted $ηN$ scattering length are discussed.

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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