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

0566026 - ÚJF 2023 RIV US eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GA19-19640S
Institucionální podpora: RVO:61389005
Klíčová slova: Lambda(1405) * pi Sigma - (K) over barN
Obor OECD: Particles and field physics
Impakt faktor: 5, rok: 2022
Způsob publikování: Omezený přístup
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.
Trvalý link: https://hdl.handle.net/11104/0337463