arXiv 1410.76802014-10-28nucl-ex

$η$和$η'$介子在核子和核上的产生

Production of $η$ and $η'$ Mesons on Nucleons and Nuclei

B. Krusche, C. Wilkin

备注：: accepted for publication in Progress in Particle and Nuclear Physics
发表信息：: Progress in Particle and Nuclear Physics 80 (2015) 43
DOI：: 10.1016/j.ppnp.2014.10.001

摘要：

本文综述了光子和强子在自由核子、准自由核子和原子核上引起的反应中$η$和$η^{\prime}$介子的产生。广泛的数据库$γN \to ηN$，质子和中子的目标，详细描述了其影响的搜索$N^{\star}$共振重得多的主导$S_{11}(1535)$讨论。虽然目前对$η^{\prime}$或$ηπ$对的产生知之甚少，但它们也为寻找失踪的同量异位素提供了诱人的前景。在所讨论的分波分析中，关于π介子诱导产生的有限数据仍然是必要的。在$pp$和$pn$碰撞中$η$ -介子的产生再次显示了$S_{11}(1535)$同量异位素的强烈影响，这与在$η^{\prime}$产生的阈值附近看到的相对较弱的行为形成对比。这种差异反映在原子核中$η$的重要终态相互作用效应中，甚至可能导致该介子在某些系统中被“束缚”。对$γA$和$p A$碰撞的证据进行了审查。$η$、$η^{\prime}$和$ηπ$对从原子核的光生提供了关于$η$和$η^{\prime}$与原子核的产生机制和相互作用的进一步信息，并且$ηπ$对甚至可以允许获得在直接单介子光生中被禁止的低质量$ηA$系统。

英文摘要：

The production of $η$ and $η^{\prime}$ mesons in photon- and hadron-induced reactions on free and quasi-free nucleons and on nuclei is reviewed. The extensive database on $γN \to ηN$, for both proton and neutron targets, is described in detail and its implications for the search for $N^{\star}$ resonances much heavier than the dominant $S_{11}(1535)$ discussed. Though less is currently known about the production of the $η^{\prime}$ or of $ηπ$ pairs, these also offer tantalizing prospects in the search for the missing isobars. The more limited data available on pion-induced production are still necessary ingredients in the partial wave analysis discussed. The production of the $η$-meson in $pp$ and $pn$ collisions shows once again the strong influence of the $S_{11}(1535)$ isobar, which is in contrast to the relatively weak behaviour seen near threshold for $η^{\prime}$ production. This difference is reflected in the important final state interaction effects of the $η$ in nuclei that may even lead to this meson being "bound" in some systems. The evidence for this is reviewed for both $γA$ and $p A$ collisions. The inclusive photoproduction of $η$, $η^{\prime}$, and $ηπ$ pairs from nuclei provides further information regarding the production mechanism and the interaction of the $η$ and $η^{\prime}$ with nuclei and the $ηπ$ pairs may even allow access to low mass $ηA$ systems that are forbidden in direct single-meson photoproduction.

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