Application of the single-channel, single-energy AA/PWA method to $K^{+}\Lambda$ photoproduction

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 $\eta$ photoproduction in ref. Svarc et al, PRC 102, 064609 (2020), is applied to the $K^{+}\Lambda$ 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 $K^{+}\Lambda$ photoproduction given in refs. Anisovich et al PRL 119 062004 (2017) and Anisovich et al 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.

arXiv comment37 pages, 20 Figures, 3 tables

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