Backward-angle photoproduction of $\pi^0$ mesons on the proton at $E_\gamma$ = 1.5--2.4 GeV
| Autor: | Sumihama, M., Ahn, J. K., Akimune, H., Asano, Y., Chang, W. C., Daté, S., Ejiri, H., Fujimura, H., Fujiwara, M., Hicks, K., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., Kawai, H., Kim, Z. Y., Kino, K., Kohri, H., Kumagai, N., Makino, S., Matsumura, T., Matsuoka, N., Mibe, T., Miyabe, M., Miyachi, Y., Morita, M., Muramatsu, N., Nakano, T., Niiyama, M., Nomachi, M., Ohashi, Y., Ohkuma, H., Ooba, T., Oshuev, D. S., Rangacharyulu, C., Sakaguchi, A., Sato, T., Shagin, P. M., Shiino, Y., Shimizu, H., Sugaya, Y., Toyokawa, H., Wakai, A., Wang, C. W., Wang, S. C., Yonehara, K., Yorita, T., Yosoi, M., Zegers, R. G. T. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Phys.Lett.B657:32-37,2007 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physletb.2007.10.032 |
| Popis: | Differential cross sections and photon beam asymmetries for $\pi^0$ photoproduction have been measured at $E_\gamma$ = 1.5--2.4 GeV and at the $\pi^0$ scattering angles, --1 $<$ cos$\Theta_{c.m.} <$ --0.6. The energy-dependent slope of differential cross sections for $u$-channel $\pi^0$ production has been determined. An enhancement at backward angles is found above $E_\gamma$ = 2.0 GeV. This is inferred to be due to the $u$-channel contribution and/or resonances. Photon beam asymmetries have been obtained for the first time at backward angles. A strong angular dependence has been found at $E_\gamma >$ 2.0 GeV, which may be due to the unknown high-mass resonances. Comment: 12 pages, 4 figures, submitted to PLB |
| Databáze: | arXiv |
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