Photoproduction of Θ+(1540,1/2+) reexamined with new theoretical information

We reinvestigate the photoproduction of the exotic pentaquark baryon Θ+(1540,1/2+) from the γN→KΘ+ reaction process within the effective Lagrangian approach, taking into account new theoretical information on the KNΘ and K*NΘ coupling strengths from the chiral-quark-soliton model (χQSM). We also consider the crossing-symmetric hadronic form factor, satisfying the on-shell condition as well. Because of the sizable vector and tensor couplings for the vector kaon, gK*NΘ and fK*NΘ, which are almost the same with the vector coupling gKNΘ≅0.8 for the pseudoscalar kaon, the K*-exchange contribution plays a critical role in the photon-beam asymmetries.