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The \gamma d \to K^+K^-pn reaction has been studied to search for theevidence of the \Theta^+ by detecting K^+K^- pairs at forward angles. TheFermi-motion corrected nK^+ invariant mass distribution shows a narrow peak at1.524 +- 0.002 + 0.003 GeV/c^2. The statistical significance of the peakcalculated from a shape analysis is 5.1 \sigma, and the differentialcross-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 LEPSangular range by assuming the isotropic production of the \Theta^+ in the\gamma n center-of-mass system. The obtained results support the existence ofthe \Theta^+.

Evidence of the \Theta^+ in the \gamma d \to K^+K^-pn reaction