The production of \(\eta ^{(\prime )}\pi \) pairs constitutes one of the golden channels to search for hybrid exotics, with explicit gluonic degrees of freedom. Understanding the dynamics and backgrounds associated to \(\eta ^{(\prime )}\pi \) production above the resonance region is required to impose additional constraints to the resonance extraction. We consider the reaction \(\pi ^-p\rightarrow \eta ^{(\prime )} \pi ^- \,p\) measured by COMPASS. We show that the data in \(2.4< m_{\eta ^{(\prime )}\pi } < 3.0{\mathrm {\,GeV}} \) can be described by amplitudes based on double-Regge exchanges. The angular distribution of the meson pairs, in particular in the \(\eta ' \pi \) channel, can be attributed to flavor singlet exchanges, suggesting the presence of a large gluon content that couples strongly to the produced mesons.

生产\（\ ETA ^ {（\素数）} \ PI \）对构成所述金信道之一来搜索混合外来，具有明确gluonic自由度。需要了解与共振区域上方的\(\eta ^{(\prime )}\pi \)产生相关的动力学和背景，以对共振提取施加额外的约束。我们考虑由 COMPASS 测量的反应\(\pi ^-p\rightarrow \eta ^{(\prime )} \pi ^- \,p\)。我们表明\(2.4< m_{\eta ^{(\prime )}\pi } < 3.0{\mathrm {\,GeV}} \) 中的数据可以通过基于双Regge 交换的振幅来描述。介子对的角分布，特别是在\(\eta ' \pi \) 通道，可归因于风味单线态交换，表明存在大量与产生的介子强烈耦合的胶子含量。