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Evidence for a narrow S = +1 baryon resonance in photoproduction from the neutron |
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| Authors: | 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 |
| Institution: | Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan. |
| Abstract: | 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. |
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