Search for the K−pp bound state via γd→K+π−X reaction at Eγ=1.5–2.4 GeV
- Tokiyasu, A.O.
- Niiyama, M.
- Parker, J.D.
- Ahn, D.S.
- Ahn, J.K.
- Ajimura, S.
- Akimune, H.
- Asano, Y.
- Chang, W.C.
- Chen, J.Y.
- Daté, S.
- Ejiri, H.
- Fujimura, H.
- Fujiwara, M.
- Fukui, S.
- Hasegawa, S.
- Hicks, K.
- Horie, K.
- Hotta, T.
- Hwang, S.H.
- Imai, K.
- Ishikawa, T.
- Iwata, T.
- Kato, Y.
- Kawai, H.
- Kino, K.
- Kohri, H.
- Kon, Y.
- Kumagai, N.
- Lin, D.L.
- Maeda, Y.
- Makino, S.
- Matsuda, T.
- Matsumura, T.
- Matsuoka, N.
- Mibe, T.
- Miyabe, M.
- Miyachi, M.
- Muramatsu, N.
- Murayama, R.
- Nakano, T.
- Nakatsugawa, Y.
- Nomachi, M.
- Ohashi, Y.
- Ohkuma, H.
- Ohta, T.
- Ooba, T.
- Oshuev, D.S.
- Rangacharyulu, C.
- Ryu, S.Y.
- Sakaguchi, A.
- Sawada, T.
- Shagin, P.M.
- Shiino, Y.
- Shimizu, H.
- Strokovsky, E.A.
- Sugaya, Y.
- Sumihama, M.
- Tang, J.L.
- Toi, Y.
- Toyokawa, H.
- Tsunemi, T.
- Uchida, M.
- Ungaro, M.
- Wakai, A.
- Wang, C.W.
- Wang, S.C.
- Yonehara, K.
- Yorita, T.
- Yoshimura, M.
- Yosoi, M.
- Zegers, R.G.T.
Publication date
January 2014
DOI Publisher
The Authors. Published by Elsevier B.V.Abstract
AbstractA search for the K−pp bound state (the lightest kaonic nucleus) has been performed using the γd→K+π−X reaction at Eγ=1.5–2.4 GeV at LEPS/SPring-8. The differential cross section of the K+π− photo-production off deuterium (d2σ/dcosθK+lab/dcosθπ−lab) has been measured for the first time in this energy region. A peak structure was searched for in the inclusive missing mass spectrum. A statistically significant peak structure was not observed in the region from 2.22 to 2.36 GeV/c2. The upper limits of the differential cross section of the K−pp bound state production were determined to be (0.17–0.55), (0.55–1.7) and (1.1–2.9) μb at 95% confidence level with the assumed widths of 20 MeV, 60 MeV and 100 MeV
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