期刊
PHYSICAL REVIEW C
卷 79, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.79.025210
关键词
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资金
- Ministry of Education, Science, Sports and Culture of Japan
- National Science Council of the Republic of China (Taiwan)
- National Science Foundation (USA)
- Korea Research Foundation (Korea)
The gamma d -> K(+)K(-)pn reaction has been studied to search for the evidence of the Theta(+) 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/c(2). The statistical significance of the peak calculated from a shape analysis is 5.1 sigma, and the differential cross section for the gamma n -> K-Theta(+) 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 Theta(+) in the gamma n center-of-mass system. The obtained results support the existence of the Theta(+).
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