Evidence for theΘ+in theγd→K+K−pnreaction by detectingK+K−pairs
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2009
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Abstract
The γd→K+K−pn reaction has been studied to search for the evidence of the Θ+ by detecting K+K− pairs at forward angles. The Fermi-motion-corrected nK+ invariant mass distribution shows a narrow peak at 1.524±0.002+0.003 GeV/c2. The statistical significance of the peak calculated from a shape analysis is 5.1 σ, and the differential cross section for the γn→K−Θ+ reaction is estimated to be 12±2 nb/sr in the photon energy range from 2.0 to 2.4 GeV in the LEPS angular range by assuming the isotropic production of the Θ+ in the γn center-of-mass system. The obtained results support the existence of the Θ+.
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| Authors | T. Nakano,N. Muramatsu,D. S. Ahn,J. K. Ahn,H. Akimune,Y. Asano,W. C. Chang,S. Daté,H. Ejiri,H. Fujimura,M. Fujiwara,S. Fukui,H. Hasegawa,K. Hicks,K. Horie,T. Hotta,K. Imai,T. Ishikawa,T. Iwata,Y. Kato,H. Kawai,Z. Y. Kim,K. Kino,H. Kohri,N. Kumagai,S. Makino,T. Matsuda,N. Matsuoka,T. Matsumura,T. Mibe,M. Miyabe,Y. Miyachi,M. Niiyama,M. Nomachi,Y. Ohashi,H. Ohkuma,T. Ooba,D. S. Oshuev,C. Rangacharyulu,A. Sakaguchi,P. M. Shagin,Y. Shiino,A. Shimizu,Y. Sugaya,M. Sumihama,Y. Toi,H. Toyokawa,A. Wakai,C. W. Wang,S. C. Wang,K. Yonehara,T. Yorita,M. Yoshimura,M. Yosoi,R. G. T. Zegers;T. Nakano;N. Muramatsu;D. S. Ahn;J. K. Ahn;H. Akimune;Y. Asano;W. C. Chang;S. Daté;H. Ejiri;H. Fujimura;M. Fujiwara;S. Fukui;H. Hasegawa;K. Hicks;K. Horie;T. Hotta;K. Imai;T. Ishikawa;T. Iwata;Y. Kato;H. Kawai;Z. Y. Kim;K. Kino;H. Kohri;N. Kumagai;S. Makino;T. Matsuda;N. Matsuoka;T. Matsumura;T. Mibe;M. Miyabe;Y. Miyachi;M. Niiyama;M. Nomachi;Y. Ohashi;H. Ohkuma;T. Ooba;D. S. Oshuev;C. Rangacharyulu;A. Sakaguchi;P. M. Shagin;Y. Shiino;A. Shimizu;Y. Sugaya;M. Sumihama;Y. Toi;H. Toyokawa;A. Wakai;C. W. Wang;S. C. Wang;K. Yonehara;T. Yorita;M. Yoshimura;M. Yosoi;R. G. T. Zegers; |
| Journal | physical review c |
| Year | 2009 |
| DOI |
10.1103/physrevc.79.025210
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| URL | |
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