The constituent counting ruling (CCR) has been found to hold for numerous hard, exclusive processes. It predicts the differential cross section at high energies and fixed $cos{\theta }_{\mathrm{c}.\mathrm{m}.}$ should follow $\frac{d\sigma }{dt}\sim \frac{1}{s^{n-2}}$, where $n$ is the minimal number of constituents involved in the reaction. Conversely, there are hard, exclusive processes for which it has been found that the CCR does not work. The exact reasons for these have not been clearly established. One such example, for which the analysis of CLAS data deviates from the prediction of the CCR, is the omega photoproduction reaction. Here, we provide an in-depth analysis of the reaction $\gamma p\to \omega p$ at ${\theta }_{\mathrm{c}.\mathrm{m}.}\approx {90}^{\circ }$ using CLAS data with an energy range of $s=5\text{–}8{\mathrm{GeV}}^2$, where the CCR has been shown to work in other reactions. We argue for a stringent method to select data to test the CCR. Naïvely, this reaction would have $n=9$ and we would expect a scaling of $s^{-7}$. Instead, a scaling of $s^{-(9.08\pm 0.11)}$ was observed. A careful analysis of conservation of angular momentum is proposed to explain the discrepancy, supporting the validity of the CCR when applied properly.

中文翻译：

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成分计数规则和ω照片制作

已发现选民计数裁决 (CCR) 对许多艰难的、排他性的过程都适用。它预测高能量和固定的微分横截面$cos{\theta }_{\mathrm{C}.\mathrm{米}.}$ 应该遵循 $\frac{d\sigma }{d吨}～\frac{1}{{秒}^{n-2}}$， 在哪里 $n$是参与反应的最少成分数。相反，已经发现 CCR 对某些困难的、排他的过程不起作用。这些的确切原因尚未明确确定。一个这样的例子，其中 CLAS 数据的分析偏离了 CCR 的预测，是欧米茄光生产反应。在这里，我们提供了对反应的深入分析$\gamma 磷\to \omega 磷$ 在 ${\theta }_{\mathrm{C}.\mathrm{米}.}\approx {90}^{\circ }$ 使用能量范围为 CLAS 的数据 $秒=5\text{——}8{\mathrm{电子伏特}}^2$，其中 CCR 已被证明在其他反应中起作用。我们主张采用严格的方法来选择数据来测试 CCR。天真地，这种反应会$n=9$ 我们希望规模扩大 ${秒}^{-7}$. 相反，缩放${秒}^{-(9.08\pm 0.11)}$被观测到。提出了对角动量守恒的仔细分析来解释这种差异，支持正确应用 CCR 的有效性。