Effects of $N(2000){5/2}^{+}$ on $\gamma p\to K^{+}\Lambda (1405)$

Abstract

The photoproduction reaction of $\gamma p\to K^{+}\Lambda (1405)$ is investigated based on an effective Lagrangian approach at the tree-level approximation with the purpose of understanding the reaction mechanism and extracting the resonance contents and the associated resonance parameters in this reaction. Apart from the $t$-channel $K$ and $K^{\ast }$ exchanges, $s$-channel nucleon ($N$) exchange, $u$-channel $\Sigma$, $\Lambda$, and $\Lambda (1405)$ exchanges, and generalized contact term, the exchanges of a minimum number of $N$ resonances in the $s$ channel are taken into account in constructing the reaction amplitudes to describe the experimental data. It is found that by introducing the $N(2000){5/2}^{+}$ resonance exchange in the $s$ channel, one can reproduce the most recent differential cross-section data from the CLAS Collaboration quite well. Further analysis shows that the cross sections of $\gamma p\to K^{+}\Lambda (1405)$ at high energies are dominated by the $t$-channel $K$ exchange, while the contributions from the $s$-channel $N$ and $N(2000){5/2}^{+}$ exchanges are rather significant to the cross sections in the near-threshold energy region. Predictions for the beam and target asymmetries for $\gamma p\to K^{+}\Lambda (1405)$ are given.

arXiv comment8 pages, 6 figures; typos corrected; version published in Phys. Rev. C. arXiv admin note: text overlap with arXiv:2002.04213

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Cited by in corpus (5)

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• Photo-production of lowest ${\Sigma }_{1/2^{-}}^{\ast }$ state within the Regge-effective Lagrangian approach
• Gauge invariance of meson photo- and electroproduction currents revisited
• Analysis of the data for $\gamma p\to f_1(1285)p$ photoproduction
• Photoproduction $\gamma p\to K^{+}\Lambda (1690)$ in an effective Lagrangian approach