| Autor: |
Y. Miyachi, N. Matsuoka, Y. Asano, T. Sasaki, M. Sumihama, Tetsuhiko Yorita, J. K. Ahn, Atsushi Sakaguchi, M. Miyabe, P. M. Shagin, K. Yonehara, Masato Yoshimura, W. C. Chang, H. Kohri, S. C. Wang, Hidetoshi Akimune, K. Imai, M. Niiyama, Hajime Shimizu, H. Fujimura, A. Wakai, Takuji Ishikawa, T. Ooba, Tomoaki Hotta, Takahiro Iwata, M. Fujiwara, D. S. Oshuev, Masaharu Nomachi, S. Daté, N. Kumagai, T. Nakano, Z. Y. Kim, S. Makino, Hiroyuki Toyokawa, Y. Shiino, T. Matsumura, K. Hicks, Haruo Ohkuma, D. S. Ahn, H. Kawai, Y. Ohashi, M. Morita, N. Muramatsu, Chary Rangacharyulu, Yorihito Sugaya, M. Yosoi, R. G.T. Zegers, C. W. Wang, Hiroyasu Ejiri, K. Miwa, K. Kino, Tsutomu Mibe |
| Předmět: |
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| Zdroj: |
Scopus-Elsevier |
| Popis: |
The $\ensuremath{\gamma}n\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}n$ reaction on $^{12}\mathrm{C}$ has been studied by measuring both ${K}^{+}$ and ${K}^{\ensuremath{-}}$ at forward angles. A sharp baryon resonance peak was observed at $1.54\ifmmode\pm\else\textpm\fi{}0.01\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$ with a width smaller than $25\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{c}^{2}$ and a Gaussian significance of $4.6\ensuremath{\sigma}$. 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 ($uudd\overline{s}$) 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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