Abstract
We investigate kaon photoproduction off the neutron target, i.e., γn→K0Λ, focusing on the role of nucleon resonances given in the Review of Particle Data Group in the range of s≈1600–2200 MeV. We employ an effective Lagrangian method and a Regge approach. The strong couplings of nucleon resonances with KΛ vertices are constrained by quark model predictions. The numerical results of the total and differential cross sections are found to be in qualitative agreement with the recent CLAS and FOREST experimental data. We discuss the effects of the narrow nucleon resonance N(1685,1/2+) on both the total and differential cross sections near the threshold energy. In addition, we present the results of the beam asymmetry as a prediction.
Highlights
We investigate kaon photoproduction off the neutron target, i.e., γn → K0Λ, fo√cusing on the role of nucleon resonances given in the Review of Particle Data Group in the range of s ≈ 1600 − 2200 MeV
We discuss the effects of the narrow nucleon resonance N (1685, 1/2+) on both the total and differential cross sections near the threshold energy
In the present Letter, we investigate the K0Λ photoproduction off the neutron, focussing on the effects of the narrow resonance structure around 1.68 GeV, which appeared in the γn → ηn reaction
Summary
The strong coupling constants, gKΛN∗, can be extracted from the quark model predictions where the information about the decay amplitude for the N ∗ → KΛ decay is given [38]. They are related by the following relation [39]: K(q) Λ(−q, mf )| − iHint|N ∗(0, mj) = 4πMN∗. Where l ml and Yl,ml (q) are the Clebsch-Gordan coefficients and spherical harmonics, respectively. The decay width is obtained from the partial-wave decay amplitude G(l). The spin and parity of the nucleon resonance impose constraints on the relative orbital angular momentum l of the KΛ final state
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