Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-09-15
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 11 figures
Scientific paper
We investigate the K* Lambda(1116) photoproduction off the proton target, using the tree-level Born approximation within the effective Lagrangian approach. We take into account the kappa, K and K* exchanges in the t channel in addition to the nucleon- and hyperon-pole contributions in the s and u channels with the gauge-invariant form-factor scheme. The Regge trajectories of the strange-mesons are also taken into account for the t-channel contributions in such a way that the Feynman and Regge propagators are interpolated smoothly for the relevant photon energy region. We provide numerical results for the energy and angular dependences of the cross sections which result in a good agreement with the presently available experimental data from CLAS collaboration at Jefferson laboratory. It turns out that the Feynman-Regge interpolation for the meson exchanges play a critical role in reproducing the data simultaneously for the low and relatively high energy regions. We also compute the momentum-transfer dependence of the differential cross section in the t-channel and the photon-beam asymmetry as a guide for future experiments.
Nam Seung-il
Yu Byung-Geel
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