$K^+\Lambda$(1405) photoproduction at the BGO-OD experiment

TL;DR

This paper reports on the measurement of the photoproduction of the $ ext{K}^+ ext{Lambda}(1405)$ reaction at the BGO-OD experiment, providing insights into its structure and decay modes, which are relevant for understanding exotic hadronic states.

Contribution

The study presents the first measurements of $ ext{K}^+ ext{Lambda}(1405)$ photoproduction using the BGO-OD setup, offering new experimental data on this poorly understood resonance.

Findings

Preliminary cross-section measurements obtained.

Decay mode analysis indicating suppression of certain channels.

Data supports the exotic or meson-baryon nature of $ ext{Lambda}(1405)$.

Abstract

Since the discovery of the $\Lambda(1405)$, it remains poorly described by conventional constituent quark models, and it is a candidate for having an "exotic" meson-baryon or "penta-quark" structure, similar to states recently reported in the hidden charm sector. The $\Lambda(1405)$ can be produced in the reaction $\gamma p \rightarrow K^+\Lambda(1405)$. The pure I=0 decay mode into $\Sigma^0\pi^0$ is prohibited for the mass-overlapping $\Sigma(1385)$. Combining a large aperture forward magnetic spectrometer and a central BGO crystal calorimeter, the BGO-OD experiment is ideally suited to measure this decay with the $K^+$ in the forward direction. Preliminary results are presented. *Supported by DFG (PN 388979758, 405882627).