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arXiv 1906.04841hep-ph
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GlueX光生$ηπ^0$中的角分布矩和光束不对称性

Moments of angular distribution and beam asymmetries in $ηπ^0$ photoproduction at GlueX

V. Mathieu, M. Albaladejo, C. Fernández-Ramírez, A. W. Jackura, M. Mikhasenko, A. Pilloni, A. P. Szczepaniak

备注：
17 pages, 7 figures, match the published version
发表信息：
Phys. Rev. D 100, 054017 (2019)
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摘要：

在寻找奇异介子的过程中，GSTX合作项目将很快提取出$ηπ^0$角分布的矩。基于这些结果，我们将矩提取的形式推广到线偏振态产生两个介子的情况，并建立了反应$\vec γp \to ηπ^0 p$的模型.该模型包括由自然交换产生的$ηπ^0$中的共振$S$ -、$P$ -、$D$ -波。计算了有和没有$P$波的$ηπ^0$角分布的矩，以说明对奇异共振的敏感性。虽然偶角动量矩对$P$波的敏感性很小，但奇角动量矩与$P$波与主要的$S$波和$D$波之间的干扰成正比。我们还推广了两介子光生的光束不对称性的定义，并指出，当介子动量垂直于反应平面时，光束不对称性增强了对奇异$P$波的灵敏度。

英文摘要：

In the search for exotic mesons, the GlueX collaboration will soon extract moments of the $ηπ^0$ angular distribution. In the perspective of these results, we generalize the formalism of moment extraction to the case in which the two mesons are produced with a linearly polarized beam, and build a model for the reaction $\vec γp \to ηπ^0 p$. The model includes resonant $S$-, $P$-, $D$-waves in $ηπ^0$, produced by natural exchanges. Moments of the $ηπ^0$ angular distribution are computed with and without the $P$-wave, to illustrate the sensitivity to exotic resonances. Although little sensitivity to the $P$-wave is found in moments of even angular momentum, moments of odd angular momentum are proportional to the interference between the $P$-wave and the dominant $S$- and $D$-waves. We also generalize the definition of the beam asymmetry for two mesons photoproduction and show that, when the meson momenta are perpendicular to the reaction plane, the beam asymmetry enhances the sensitivity to the exotic $P$-wave.

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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