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The existence of the $J^p=1/2^+$ narrow resonance predicted by the chiralsoliton model has been investigated by utilizing the new kaon photoproductiondata. For this purpose, we have constructed two phenomenological models, whichare able to describe kaon photoproduction from threshold up to W=1730 MeV. Byvarying the resonance mass, width, and $K\Lambda$ branching ratio in thisenergy range we found that the most convincing mass of this resonance is 1650MeV. Using this result we estimate the masses of other antidecuplet familymembers.

Evidence of the non-strange partner of pentaquark from the elementary $K^+\Lambda$ photoproduction