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

## TL;DR

This paper reanalyzes high-precision data for the reaction $b3 p d K^{*+} b5$ using a Regge-inspired model, successfully describing the data with minimal resonances and clarifying the role of various exchange contributions.

## Contribution

It introduces a Regge-inspired effective Lagrangian approach to describe the reaction, highlighting the sufficiency of a single resonance, N(2060)5/2^-, in fitting the data.

## Key findings

- The differential cross-section data can be described with only the N(2060)5/2^- resonance.
- The mass of N(2060)5/2^- is well determined, independent of t-channel modeling.
- The width of N(2060)5/2^- remains uncertain and model-dependent.

## Abstract

The high-precision differential cross-section data for the reaction $\gamma p \to K^{*+}\Lambda$ 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 $K^*$ 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 $\gamma p \to K^{*+}\Lambda$ 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.