Phys. Rev. Lett.
91,
012002
(2003)
[4 pages]
Evidence for a Narrow S=+1 Baryon Resonance in Photoproduction from the Neutron
T. Nakano et al.
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T. Nakano1, D. S. Ahn2, J. K. Ahn2, H. Akimune3, Y. Asano4,5, W. C. Chang6, S. Daté7, H. Ejiri7,1, H. Fujimura8, M. Fujiwara1,5, K. Hicks9, T. Hotta1, K. Imai10, T. Ishikawa11, T. Iwata12, H. Kawai13, Z. Y. Kim8, K. Kino1, H. Kohri1, N. Kumagai7, S. Makino14, T. Matsumura1,5, N. Matsuoka1, T. Mibe1,5, K. Miwa10, M. Miyabe10, Y. Miyachi15,*, M. Morita1, N. Muramatsu5, M. Niiyama10, M. Nomachi16, Y. Ohashi7, T. Ooba13, H. Ohkuma7, D. S. Oshuev6, C. Rangacharyulu17, A. Sakaguchi16, T. Sasaki10, P. M. Shagin1,†, Y. Shiino13, H. Shimizu11, Y. Sugaya16, M. Sumihama16,5, H. Toyokawa7, A. Wakai18,‡, C. W. Wang6, S. C. Wang6,§, K. Yonehara3,**, T. Yorita7, M. Yoshimura19, M. Yosoi10, and R. G. T. Zegers1
1Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
2Department of Physics, Pusan National University, Busan 609-735, Korea
3Department of Physics, Konan University, Kobe, Hyogo 658-8501, Japan
4Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Mikazuki, Hyogo 679-5198, Japan
5Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
6Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
7Japan Synchrotron Radiation Research Institute, Mikazuki, Hyogo 679-5198, Japan
8School of Physics, Seoul National University, Seoul, 151-747, Korea
9Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
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 University, Wakayama, Wakayama 641-8509, Japan
15Department of Physics and Astrophysics, Nagoya University, Nagoya, Aichi 464-8602, Japan
16Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
17Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2
18Center for Integrated Research in Science and Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
19Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
Received 14 January 2003; published 3 July 2003
The γn→K+K-n reaction on 12C has been studied by measuring both K+ and K- at forward angles. A sharp baryon resonance peak was observed at 1.54±0.01 GeV/c2 with a width smaller than 25 MeV/c2 and a Gaussian significance of 4.6σ. The strangeness quantum number (S) of the baryon resonance is +1. It can be interpreted as a molecular meson-baryon resonance or alternatively as an exotic five-quark state (uudds̅ ) that decays into a K+ and a neutron. The resonance is consistent with the lowest member of an antidecuplet of baryons predicted by the chiral soliton model.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.012002
DOI:
10.1103/PhysRevLett.91.012002
PACS:
13.60.Rj, 13.60.Le, 14.20.Jn
*Present address: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan. †Present address: School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA. ‡Present address: Akita Industry Promotion Foundation, Akita 010-8572, Japan. §Present address: Institute of Statistical Science, Academia Sinica, Nankang, 115 Taipei, Taiwan. **Present address: Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120, USA.
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