Search for the Θ+ via the K+p→π+X reaction with a 1.2 GeV/c K+ beam

K. Miwa, S. Dairaku, D. Nakajima, S. Ajimura, J. Arvieux, H. Fujimura, H. Fujioka, T. Fukuda, H. Funahashi, M. Hayata, K. Hicks, K. Imai, S. Ishimoto, T. Kameyama, S. Kamigaito, S. Kinoshita, T. Koike, Y. Ma, T. Maruta, Y. MiuraM. Miyabe, T. Nagae, T. Nakano, K. Nakazawa, M. Naruki, H. Noumi, M. Niiyama, N. Saito, Y. Sato, S. Sawada, Y. Seki, M. Sekimoto, K. Senzaka, K. Shirotori, K. Shoji, S. Suzuki, H. Takahashi, T. Takahashi, T. N. Takahashi, H. Tamura, N. Tanaka, K. Tanida, A. Toyada, T. Watanabe, M. Yosoi, R. Zavislak

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23 Citations (Scopus)


The Θ+ was searched for via the K+p→π+X reaction using the 1.2 GeV/c K+ beam at the K6 beam line of the KEK-PS 12 GeV Proton Synchrotron. In the missing mass spectrum of the K+p→π+X reaction, no clear peak structure was observed. Therefore a 90% C.L. upper limit of 3.5 μb/sr was derived for the differential cross section averaged over 2° to 22° in the laboratory frame of the K+p→π+Θ+ reaction. This upper limit is much smaller than the theoretical calculation for the t-channel process where a K0* is exchanged. From the present result, either the t-channel process is excluded or the coupling constant of gK*NΘ is quite small.

Original languageEnglish
Article number045203
JournalPhysical Review C - Nuclear Physics
Issue number4
Publication statusPublished - 2008 Apr 14


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