Phys. Rev. Lett.
102,
012501
(2009)
[5 pages]
Cross Sections and Beam Asymmetry for K+Σ*- Photoproduction from the Deuteron at Eγ=1.5–2.4 GeV
K. Hicks et al. LEPS Collaboration
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K. Hicks1, D. Keller1, H. Kohri2, D. S. Ahn2,3, J. K. Ahn3, H. Akimune4, Y. Asano5, W. C. Chang6, S. Daté7, H. Ejiri2,7, S. Fukui8, H. Fujimura9,10, M. Fujiwara2,5, S. Hasegawa2, T. Hotta2, K. Imai10, T. Ishikawa11, T. Iwata12, Y. Kato2, H. Kawai13, Z. Y. Kim9, K. Kino2, N. Kumagai7, S. Makino14, T. Matsuda15, T. Matsumura2,7, N. Matsuoka2, T. Mibe2,1, M. Miyabe10, Y. Miyachi16, M. Morita2, N. Muramatsu7,2, T. Nakano2, M. Niiyama10, M. Nomachi17, Y. Oh18, Y. Ohashi7, H. Ohkuma7, T. Ooba13, J. Parker10, C. Rangacharyulu19, A. Sakaguchi17, T. Sasaki10, P. M. Shagin20, Y. Shiino13, A. Shimizu2, H. Shimizu11, Y. Sugaya17, M. Sumihama17,7, Y. Toi15, H. Toyokawa7, A. Wakai21, C. W. Wang6, S. C. Wang6, K. Yonehara4, T. Yorita2,7, M. Yoshimura22, M. Yosoi10,2, and R. G. T. Zegers23 (LEPS Collaboration)
1Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
2Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
3Department of Physics, Pusan National University, Busan 609-735, Korea
4Department of Physics, Konan University, Kobe, Hyogo 658-8501, Japan
5Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizu, Kyoto 619-0215, Japan
6Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
7Japan Synchrotron Radiation Research Institute, Mikazuki, Hyogo 679-5198, Japan
8Department of Physics and Astronomy, Nagoya University, Nagoya, Aichi 464-8602, Japan
9School of Physics, Seoul National University, Seoul 151-747, Korea
10Department of Physics, Kyoto University, Kyoto 606-8502, Japan
11Laboratory of Nuclear Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
12Department of Physics, Yamagata University, Yamagata 990-8560, Japan
13Department of Physics, Chiba University, Chiba 263-8522, Japan
14Wakayama Medical College, Wakayama 641-8509, Japan
15Department of Applied Physics, Miyazaki University, Miyazaki 889-2192, Japan
16Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
17Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
18Cyclotron Institute and Physics Department, Texas A&M University, College Station, Texas, 77843, USA
19Department of Physics, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
20School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
21Akita Research Institute of Brain and Blood Vessels, Akita 010-0874, Japan
22Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
23NSCL, Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
Received 19 September 2008; published 5 January 2009
The Σ(1385) resonance, or Σ*, is well known as part of the standard baryon decuplet with spin J=3/2. Measurements of the reaction γp→K+Σ*0 are difficult to extract due to overlap with the nearby Λ(1405) resonance. However, the reaction γn→K+Σ*- has no overlap with the Λ(1405) due to its charge. Here we report the first measurement of cross sections and beam asymmetries for photoproduction of the Σ*- from a deuteron target. The cross sections at forward angles range from 0.4 to 1.2 μb, with a broad maximum near Eγ≃1.8 GeV. The beam asymmetries are negative, in contrast with positive values for the γn→K+Σ- reaction.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.012501
DOI:
10.1103/PhysRevLett.102.012501
PACS:
25.20.Lj, 13.60.Rj, 13.88.+e, 24.70.+s
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