Photoproduction of the

M. Bayar; J. Song; L. R. Dai; E. Oset

doi:10.1140/epjc/s10052-025-13961-0

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2025) 85: 239
https://doi.org/10.1140/epjc/s10052-025-13961-0

Regular Article - Theoretical Physics

Photoproduction of the $Λ (1800)$ $\Lambda (1800)$

M. Bayar¹^,2, J. Song²^,3, L. R. Dai⁴^a and E. Oset²

¹ Department of Physics, Kocaeli Univeristy, 41380, Izmit, Turkey
² Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna, 46071, Valencia, Spain
³ School of Physics, Beihang University, 102206, Beijing, China
⁴ School of Science, Huzhou University, 313000, Huzhou, Zhejiang, China

^a dailianrong@zjhu.edu.cn

Received: 22 January 2025
Accepted: 14 February 2025
Published online: 8 March 2025

Abstract

We have carried out a study of the $γ p \to p K^{+} K^{* -} (K^{* -} \to K^{-} π^{0})$ $\gamma p \rightarrow p K^{+} K^{*-} (K^{*-} \rightarrow K^{-} \pi ^{0})$ , $γ p \to p K^{+} K^{* -} (K^{* -} \to {\bar{K}}^{0} π^{-})$ $\gamma p \rightarrow p K^{+} K^{*-} ( K^{*-} \rightarrow \bar{K}^{0} \pi ^{-} )$ and $γ p \to K^{+} K^{-} p$ $\gamma p \rightarrow K^{+} K^{-}p$ reactions, producing the $K^{+} Λ (1800)$ $K^+ \Lambda (1800)$ final state, from the perspective that the $Λ (1800)$ $\Lambda (1800)$ resonance is dynamically generated from the interaction of ${\bar{K}}^{*} N$ $\bar{K}^* N$ with its coupled vector-baryon channels, in complete analogy to the $Λ (1405)$ $\Lambda (1405)$ generated from the interaction of $\bar{K} N$ $\bar{K} N$ and its coupled pseudoscalar-baryon channels. The two reactions are complementary and their mass distributions are tied to the particular nature of this resonance in that framework. We provide much information on the shapes and strength of the invariant mass distributions of these reactions, and the energy dependence of the cross sections, that when contrasted with future experiments should shed valuable light on the nature of this resonance and its analogy to the $Λ (1405)$ $\Lambda (1405)$ .

© The Author(s) 2025

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