M. Miyabe

Interference effect between

The ϕ-Λ(1520) interference effect in the γp→K^{+}K^{-}p reaction has been measured for the first time in the energy range from 1.673 to 2.173xa0GeV. The relative phases between ϕ and Λ(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K^{+}K^{-} pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the sqrt[s]=2.1u2009u2009GeV bump structure in forward differential cross sections for ϕ photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states.

\phi

Differential cross sections at

and

t=t_{text{min}}

\Lambda(1520)

and decay asymmetries for the

production channels in the

gamma prightarrowphi p

\gamma p \rightarrow K^+K^-p

reaction have been measured using linearly polarized photons in the range 1.5 to 2.9 GeV. These cross sections were used to determine the Pomeron strength factor. The cross sections and decay asymmetries are consistently described by the

reaction near threshold

t

φ photoproduction on the proton at Eγ=1.5-2.9 GeV

-channel Pomeron and pseudoscalar exchange model in the

First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

E_{gamma}

An event mixing technique for Bose-Einstein correlations of two pions in photoproduction around 1 GeV

region above 2.37 GeV. In the lower energy region, an excess over the model prediction is observed in the energy dependence of the differential cross sections at