Photoproduction $\gamma p\to K^{\ast +}\Lambda$ in a Reggeized model

Abstract

The high-precision differential cross-section data for the reaction $\gamma p\to K^{\ast +}\Lambda$ are reanalyzed within a Regge-inspired effective Lagrangian approach. The model adopts Regge phenomenology to constrain the $t$-channel contributions from the $\kappa$, $K$, and $K^{\ast }$ exchanges. A minimal number of resonances in the $s$ channel are introduced in constructing the reaction amplitudes in order to describe the data. It is shown that the differential cross-section data for $\gamma p\to K^{\ast +}\Lambda$ can be satisfactorily described by introducing the only $N(2060){5/2}^{-}$ resonance in the $s$ channel, which is quite different from our earlier work performed in an effective Lagrangian approach [A. C. Wang {\it et al.}, Phys. Rev. C 96, 035206 (2017)], where the amplitudes are computed by evaluating Feynman diagrams and it is found that introducing at least one additional resonance apart from the $N(2060){5/2}^{-}$ is indispensable for reproducing the data. The roles of individual contributions from meson and baryon exchanges on the angular distributions are found to be highly model dependent. The extracted mass of $N(2060){5/2}^{-}$ turns out to be well determined, independent of how the $t$-channel amplitudes are constructed, whereas the width does not.

arXiv comment10 pages, 5 figures, version published in PRC

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Cited by in corpus (6)

• Light Baryon Spectroscopy
• Effects of $N(2000){5/2}^{+}$ on $\gamma p\to K^{+}\Lambda (1405)$
• Photoproduction $\gamma p\to K^{+}\Lambda (1520)$ in an effective Lagrangian approach
• Analysis of the differential cross section and photon beam asymmetry data for $\gamma p\to {\eta }^{\prime }p$
• 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