Testing chiral unitary models for the Λ(1405) in K.sup.+./sup.πΣ photoproduction

0566026 - ÚJF 2023 RIV US eng J - Journal Article
Bruns, Peter Christian - Cieplý, Aleš - Mai, M.
Testing chiral unitary models for the Λ(1405) in K⁺πΣ photoproduction.
Physical Review D. Roč. 106, č. 7 (2022), č. článku 074017. ISSN 2470-0010. E-ISSN 2470-0029
R&D Projects: GA ČR GA19-19640S
Institutional support: RVO:61389005
Keywords : Lambda(1405) * pi Sigma - (K) over barN
OECD category: Particles and field physics
Impact factor: 5, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevD.106.074017

We adopt a novel formalism for the low-energy analysis of the gamma p -> K+ pi Sigma photoproduction reaction, outlined recently in [P. C. Bruns, arXiv:2012.11298.], to calculate the pi Sigma invariant mass distributions in the Lambda(1405) resonance region. The approach adheres to constraints arising from unitarity, gauge invariance, and chiral perturbation theory, and is used without adjusting any model parameters. It is found that the meson-baryon rescattering in the final state has a major impact on the magnitude and structure of the generated spectra that are compared with the experimental data from the CLAS Collaboration. We demonstrate a large sensitivity of the theoretical predictions to the choice of the coupled-channel pi Sigma - (K) over barN model amplitudes which should enable one to constrain the parameter space of these models.
Permanent Link: https://hdl.handle.net/11104/0337463