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2008-12-04
Evidence of the \Theta^+ in the \gamma d \to K^+K^-pn reaction
T. NakanoN. MuramatsuD. S. AhnJ. K. AhnH. AkimuneY. AsanoW. C. ChangS. DatéH. EjiriH. FujimuraM. FujiwaraS. FukuiH. HasegawaK. HicksK. HorieT. HottaK. ImaiT. IshikawaT. IwataY. KatoH. KawaiZ. Y. KimK. KinoH. KohriN. KumagaiS. MakinoT. MatsudaN. MatsuokaT. MatsumuraT. MibeM. MiyabeY. MiyachiM. NiiyamaM. NomachiY. OhashiH. OhkumaT. OobaD. S. OshuevC. RangacharyuluA. SakaguchiP. M. ShaginY. ShiinoA. ShimizuH. ShimizuY. SugayaM. SumihamaY. ToiH. ToyokawaA. WakaiC. W. WangS. C. WangK. YoneharaT. YoritaM. YoshimuraM. YosoiR. G. T. Zegers
文献摘要
The \gamma d \to 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 \to K^- \Theta^+ reaction is estimated to be 12 ± 2 nb/sr in the photon energy range from 2.0 GeV 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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