The Constituent Counting Rule and Omega Photoproduction
| Autor: | Reed, Trevor, Leon, Christopher, Vera, Frank, Guo, Lei, Raue, Brian |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. C 103, 065203 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.103.065203 |
| Popis: | 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 $\cos \theta_{c.m.}$ should follow $\frac{d \sigma}{dt} \sim \frac{1}{s^{n-2}}$, where $n$ is the minimal number of constituents involved in the reaction. Here we provide an in-depth analysis of the reaction $\gamma p \rightarrow \omega p$ at $\theta_{c.m.}\sim 90^\circ$ using CLAS data with an energy range of $s = 5 - 8$ 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 and utilize a Taylor-series expansion to take advantage of data from nearby angle bins in our analysis. Na\"{i}vely, this reaction would have $n=9$ (or $n=10$ if the photon is in a $q\bar{q}$ state) and we would expect a scaling of $\sim s^{-7}$ ($s^{-8}$). Instead, a scaling of $s^{-(9.08 \pm 0.11)}$ was observed. Explanations for this apparent failure of the na\"{i}ve CCR assumptions are examined. Comment: 6 pages, 8 figures |
| Databáze: | arXiv |
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