| Photoproduction of multi-meson final states — recent results from the Crystal-Barrel/TAPS experiment at ELSA- |
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| 引用本文： | U. Thoma (for the CBELSA/TAPS collaboration). Photoproduction of multi-meson final states — recent results from the Crystal-Barrel/TAPS experiment at ELSA-[J]. 中国物理 C, 2009, 33(12): 1105-1112 |
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| 作者姓名： | U. Thoma (for the CBELSA/TAPS collaboration) |
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| 作者单位： | HISKP, Universität Bonn, Nussallee 14-16, 53115 Bonn, Germany |
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| 基金项目： | Supported by German Science Foundation （DFG） in the frame of the SFB/TR16 We acknowledge financial support from the Deutsche Forschungsgemeinschaft （DFG） within SFB/TR16. |
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| 摘 要： | Multi-meson final states such as γp →pπ0π0 and γp →pπ0η have been investigated with the Crystal-Barrel/TAPS experiment at ELSA. Baryon cascades via △π and △η and also via higher mass baryon resonances are clearly observed. Based on this data and on data from other reactions a partial wave analysis has been performed from which partial decay widths of various N＊ and △＊ states into the different pπ0π0 and pπ0η decay channels have been determined, leading partly to unexpected results. In addition, polarisation observables have been investigated. The beam asymmetry X has been determined for both reactions and double polarisation data using a longitudinally polarised target and a circularly or linearly polarised photon beam has been taken. Given the angular coverage of the Crystal-Baxrel/TAPS experiment this data covers almost the full angular range and phase space. This data will provide new and important information for the partial wave analyses and bring us one step closer towards a complete experiment.
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| 关 键 词： | 实验数据 艾尔莎 介子 光生 重子质量 分波分析 线性极化 空间角度 |
| 收稿时间： | 2009-08-07 |
Photoproduction of multi-meson final states - recent results from the Crystal-Barrel/TAPS experiment at ELSA- |
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| U. Thoma. Photoproduction of multi-meson final states - recent results from the Crystal-Barrel/TAPS experiment at ELSA-[J]. High Energy Physics and Nuclear Physics, 2009, 33(12): 1105-1112 |
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| Authors: | U. Thoma |
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| Affiliation: | HISKP, Universitat Bonn, Nussallee 14-16, 53115 Bonn, Germany |
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| Abstract: | baryon spectroscopy, photoproduction, multi-meson final states, polarisation observables |
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| Keywords: | baryon spectroscopy photoproduction multi-meson final states polarisation observables |
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