Evidence for a narrow S = +1 baryon resonance in photoproduction from the neutron

T. Nakano, D. S. Ahn, J. K. Ahn, H. Akimune, Y. Asano, W. C. Chang, S. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, K. Hicks, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, H. Kawai, Z. Y. Kim, K. Kino, H. Kohri, N. KumagaiS. Makino, T. Matsumura, N. Matsuoka, T. Mibe, K. Miwa, M. Miyabe, Y. Miyachi, M. Morita, N. Muramatsu, M. Niiyama, M. Nomachi, Y. Ohashi, T. Ooba, H. Ohkuma, D. S. Oshuev, C. Rangacharyulu, A. Sakaguchi, T. Sasaki, P. M. Shagin, Y. Shiino, H. Shimizu, Y. Sugaya, M. Sumihama, H. Toyokawa, A. Wakai, C. W. Wang, S. C. Wang, K. Yonehara, T. Yorita, M. Yoshimura, M. Yosoi, R. G.T. Zegers

Research output: Contribution to journalArticlepeer-review

950 Citations (Scopus)


A search for an S=+1 baryon resonances in the K- missing-mass spectrum of the γn→K+K-n reaction on 12C, using a newly built photon-beam facility at the SPring-8. As such, a sharp baryon resonance peak was found at 1.54±0.01 GeV/c2 in the K- missing-mass spectrum that was corrected for the Fermi motion. It was indicated that the existence of an S=+1 resonance which may be attributed to the molecular meson-baryon resonance or alternatively as an exotic five-quark baryon proposed as the Z+.

Original languageEnglish
Article number012002
Pages (from-to)012002/1-012002/4
JournalPhysical review letters
Issue number1
Publication statusPublished - 2003 Jul 4
Externally publishedYes

Bibliographical note

Funding Information:
NUPABL 10.1016/S0375-9474(01)00490-0 0375-9474 A684 , 71c ( 2001 ). R. G. T. Zegers , nucl-ex/0302005 . The authors gratefully acknowledge the dedicated efforts of the staff of the SPring-8 for providing a good quality beam. We thank Dr. T. Sato (Osaka University), Dr. A. Hosaka (RCNP), and Dr. A. Titov (JINR) for helpful discussions. This research was supported in part by the Ministry of Education, Science, Sports and Culture of Japan, by the National Science Council of Republic of China (Taiwan), and by KOSEF of Republic of Korea.

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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