Narrow or wide resonance?

We have investigated the existence of the Jp = 1/2⁺ (P₁₁) narrow resonance predicted by the chiral soliton model. For this purpose we used an isobar model developed for explaining the kaon photoproduction process. It was found that the most possible narrow resonance has a mass of 1650 MeV and a width of 5 MeV. This finding is, however, different from that obtained in the ηphotoproduction off a neutron, where the extracted mass and width are relatively larger, i.e. 1680 and 30 MeV, respectively. We have revisited the calculation by considering a wider resonance width and using the latest covariant isobar model. The result still indicates the existence of the narrow resonance with the mass of 1650 MeV, but the best agreement between experimental data and model prediction could be achieved by using the resonance mass and width of 1690 and 75 MeV, respectively. However, the possibly small N∗(1710)P¹¹ coupling constant would constrain the mass and width to be . 1680 and . 35 MeV, respectively.