Application of the single-channel, single-energy amplitude and partial-wave analysis method to ${K}^{+}\mathrm{\ensuremath{\Lambda}}$ photoproduction

Application of the single-channel, single-energy amplitude and partial-wave analysis method to $K^{+} Λ$ photoproduction

A. Švarc, Y. Wunderlich, and L. Tiator

Phys. Rev. C 105, 024614 – Published 22 February 2022

Abstract

The new single-channel, single-energy partial-wave analysis method based on a simultaneous use of amplitude and partial-wave analysis called AA-PWA, developed and tested on $η$ photoproduction in [Phys. Rev. C 102, 064609 (2020)] is applied to the $K^{+} Λ$ photoproduction for the center-of-mass energy range of $1625 MeV < W < 2296 MeV$ . A complete set of multipoles has been created. The advantages of the method have been confirmed and a comparison with the only existing single-energy partial-wave analysis of $K^{+} Λ$ photoproduction given in [Phys. Rev. Lett. 119, 062004 (2017), Eur. Phys. J. A 53, 242 (2017)] is presented. We confirm the size and shape of Bonn-Gatchina multipoles, but we do not confirm the unambiguous interpretation of the structure in the $M_{1 -}$ multipole as a $N (1880) {\frac{1}{2}}^{+}$ resonance. The decisive role of the self-consistency of the world database is emphasized.