Single-energy partial-wave analysis for pion photoproduction with fixed- t analyticity

Osmanović, H.; Hadžimehmedović, M.; Omerović, R.; Stahov, J.; Kashevarov, V.; Ostrick, M.; Tiator, L.; Švarc, Alfred (2021) Single-energy partial-wave analysis for pion photoproduction with fixed- t analyticity. Physical Review C, 104 (3). ISSN 2469-9985

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Abstract

Experimental data for pion photoproduction including differential cross sections and various polarization observables from four reaction channels, gamma p -> pi(0)p, gamma p -> pi(+)n, gamma n -> pi(-) p, and gamma n -> pi(0)n, from threshold up to W = 2.2 GeV were used in order to perform a single-energy partial-wave analysis with minimal model dependence by imposing constraints from unitarity and fixed-t analyticity in an iterative procedure. Reaction models were only used as a starting point in the very first iteration. We demonstrate that with this procedure partial-wave amplitudes can be obtained which show only a minimal dependence on the initial model assumptions. The analysis was obtained in full isospin, and the Watson theorem is enforced for energies below W = 1.3 GeV but is even fulfilled up to W approximate to 1.6 GeV in many partial waves. Electromagnetic multipoles E-l +/- and M-l +/- are presented and discussed for S, P, D, and F waves.

Item Type:	Article
Uncontrolled Keywords:	nuclear reactions; particle production; photonuclear reactions
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Depositing User:	Alfred Švarc
Date Deposited:	04 May 2026 19:23
URI:	https://fulir.irb.hr:/id/eprint/11884
DOI:	10.1103/physrevc.104.034605

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