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

The gamman-->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/c(2) with a width smaller than 25 MeV/c(2) and a Gaussian significance of 4.6sigma. The strangeness quantum number (S) of the baryon...

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Veröffentlicht in:	Physical review letters 2003-07, Vol.91 (1), p.012002-012002, Article 012002
Hauptverfasser:	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, Kumagai, N, Makino, S, Matsumura, T, Matsuoka, N, Mibe, T, Miwa, K, Miyabe, M, Miyachi, Y, Morita, M, Muramatsu, N, Niiyama, M, Nomachi, M, Ohashi, Y, Ooba, T, Ohkuma, H, Oshuev, D S, Rangacharyulu, C, Sakaguchi, A, Sasaki, T, Shagin, P M, Shiino, Y, Shimizu, H, Sugaya, Y, Sumihama, M, Toyokawa, H, Wakai, A, Wang, C W, Wang, S C, Yonehara, K, Yorita, T, Yoshimura, M, Yosoi, M, Zegers, R G T
Format:	Artikel
Sprache:	eng
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Zusammenfassung:	The gamman-->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/c(2) with a width smaller than 25 MeV/c(2) and a Gaussian significance of 4.6sigma. 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 (uuddsmacr;) 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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.91.012002