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Measurement of polarized target asymmetry in γp → π+n below 1.02 GeV |
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| Authors: | M Fukushima N Horikawa R Kajikawa H Kobayakawa K Mori T Nakanishi CO Pak S Suzuki T Matsuda N Tokuda M Daigo T Ohshima |
| Institution: | Department of Physics, Nagoya University, Nagoya, Japan;Department of Applied Mathematics, Osaka University, Toyonaka, Japan;Department of Physics, Kyoto University, Kyoto, Japan;Institute for Nuclear Study, University of Tokyo, Tanashi, Japan |
| Abstract: | The polarized target asymmetry for the process γp → π+n has been measured for incident photon energies below 1.02 GeV over a range of c.m. angles from 40° to 160°. π+ mesons from a polarized butanol target were detected by a magnetic spectrometer. The results are compared with predictions given by existing analyses. A tentative interpretation of the data is performed, and a larger contribution of S-wave resonances is suggested. The photocouplings of dominant resonances were hardly changed by the inclusion of new data and they seem to be almost uniquely determined. |
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