Single-channel and single-energy partial-wave analysis with continuity improved through minimal phase constraints

Švarc, A.; Workman, R. L. (2024) Single-channel and single-energy partial-wave analysis with continuity improved through minimal phase constraints. Physical Review C, 110 (2). ISSN 2469-9985

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Abstract

Single-energy partial-wave analysis has often been applied as a way to fit data with minimal model dependence. However, remaining unconstrained, partial waves at neighboring energies will vary discontinuously because the overall amplitude phase cannot be determined through single-channel measurements. This problem can be mitigated through the use of a constraining penalty function based on an associated energy-dependent fit. However, the weight given to this constraint results in a biased fit to the data. In this paper, for the first time, we explore a constraining function which does not influence the fit to data. The constraint comes from the overall phase found in multichannel fits which, in the present study, are the Bonn-Gatchina and J & uuml;lich-Bonn multichannel analyses. The data are well reproduced and weighting of the penalty function does not influence the result. The method is applied to KA photoproduction data and all observables can be maximally well reproduced. While the employed multichannel analyses display very different multipole amplitudes, we show that the major difference between two sets of multipoles can be related to the different overall phases.

Item Type:	Article
Uncontrolled Keywords:	pion; amplitudes; lambda
Subjects:	NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type The strong interaction at the frontier of knowledge: fundamental research and applications-STRONG-2020 Milorad Korolija; Damir Bosnar; Krešimir Kumerički; Kornelija Passek-Kumerički 824093 EK
Depositing User:	Ema Buhin Šaler
Date Deposited:	21 Apr 2026 13:25
URI:	https://fulir.irb.hr:/id/eprint/11773
DOI:	10.1103/PhysRevC.110.024614

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