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

T. Nakano, D. S. Ahn, Jung Keun 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

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Abstract

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
JournalPhysical Review Letters
Volume91
Issue number1
Publication statusPublished - 2003 Jul 4
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nakano, T., Ahn, D. S., Ahn, J. K., Akimune, H., Asano, Y., Chang, W. C., Daté, S., Ejiri, H., Fujimura, H., Fujiwara, M., Hicks, K., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., Kawai, H., Kim, Z. Y., Kino, K., Kohri, H., ... Zegers, R. G. T. (2003). Evidence for a narrow S = +1 baryon resonance in photoproduction from the neutron. Physical Review Letters, 91(1).