Single-energy partial wave analysis for 
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 photoproduction on the proton with fixed-
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 analyticity imposed

Osmanović, H.; Hadžimehmedović, M.; Omerović, R.; Stahov, J.; Kashevarov, V. L.; Nikonov, K.; Ostrick, M.; Tiator, L.; Švarc, Alfred

doi:10.1103/physrevc.100.055203

Cited by 9 publications

(12 citation statements)

References 47 publications

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“…In spite that it could be interpreted as some kind of uncontrolled threshold behaviour, we speculate that it might be the sign of a new, low lying P 11 1/2+ state (M = 1526 ± 25 MeV and Γ = 73 ± 37 MeV). This state was never seen before in any SE PWA, but unclear and completely uninterpreted discontinuities in that energy range in πN elastic, and π-photoproduction were reported [5,7,12,13]. The unification of all troubles with accepting a new state is offered as the simplest explanation 7 .…”

Section: Discussionmentioning

confidence: 89%

“…This state was never seen before in any SE PWA, but unclear and completely uninterpreted discontinuities in that energy range in πN elastic, and π-photoproduction were reported [5,7,12,13]. The unification of all troubles with accepting a new state is offered as the simplest explanation 7 . Residues, as discussed in the text, are much less confident, and must be correlated with the phase used in the model.…”

Section: Discussionmentioning

confidence: 89%

“…[13] and π 0 photoproduction from ref. [7]. First it is important to stress that this state is never seen in ED models.…”

Section: R E E 3 -[ M F M ]mentioning

confidence: 99%

“…This approach was revived very recently for SE PWA of η and π 0 -photoproduction by Main-Tuzla-Zagreb collaboration, and analyzed in details in refs. [6,7].…”

Section: Formalismmentioning

confidence: 99%

“…In Fig. (7) we give you the relevant partial wave for other processes: πN elastic scattering from KH80 [5,12], SE part of πN -photoproduction from ref. [13] and π 0 photoproduction from ref.…”

Section: R E E 3 -[ M F M ]mentioning

confidence: 99%

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Is the pole content of each single-energy, single-channel partial wave analysis inherently model dependent?

Svarc

2021

Preprint

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Unfortunately, yes it is. In ref. [1] it has been shown that without fixing the reaction-amplitude phase, many combinations of partial waves at neighbouring energies in single-energy, single-channel partial wave analysis reproduce experimental data identically, but are discontinuous and disconnected. To obtain the continuous solution, the phase has to be fixed to some continuous value. In the same reference it has also been shown that the change of angular part of reaction-amplitude phase mixes partial waves, so the pole structure of any single-energy single-channel partial wave analysis depends on the chosen phase. As in any single-channel analysis the overall reaction-amplitude phase cannot be determined because of continuum ambiguity, it is in principle free and has to be taken from some coupled-channel model. Because of the difference in the angular part of the phase, choosing different phases results in the change of the pole content of the obtained solution. Therefore, single-energy single-channel partial wave analysis is inherently model dependent, and the number of poles it contains strongly depends on the choice of the phase. In that reference these facts have been illustrated on the pseudo-scalar meson production toy model. This truth is now for the measured observables demonstrated on the realistic model of ref.[2] which combines amplitude and partial wave analysis in one self-consistent scheme for the the world collection of η-photoproduction data, and fixes the phase to BG2014-2 solution [3]. We show that the pole structure of the solution whose phase is very close to the BG2014-2 theoretical ED phase is very similar to the pole structure of BG2014-2 solution, but the agreement with the data is not ideal. However, improving the agreement with the data requires the departure from BG2014-2 ED phase, and this spoils analytic structure of the obtained solution. This also demonstrated under which conditions the new method of ref. [2] is reliable for direct data analysis and generating single-channel, single-energy partial wave analysis with the minimal model dependence, and we offer a new solution which is a compromise between good fit and good analytic structure.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 89%

“…[13] and π 0 photoproduction from ref. [7]. First it is important to stress that this state is never seen in ED models.…”

Section: R E E 3 -[ M F M ]mentioning

confidence: 99%

“…This approach was revived very recently for SE PWA of η and π 0 -photoproduction by Main-Tuzla-Zagreb collaboration, and analyzed in details in refs. [6,7].…”

Section: Formalismmentioning

confidence: 99%

Section: R E E 3 -[ M F M ]mentioning

confidence: 99%

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Is the pole content of each single-energy, single-channel partial wave analysis inherently model dependent?

Svarc

2021

Preprint

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Truncated partial-wave analysis in pion-electroproduction

Omerović,

Osmanović

2024

J. Phys.: Conf. Ser.

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Numerical and pseudo data for pion electroproduction from four reaction channels, p(γ*, π 0)p, p(γ*, π +)n, n(γ*, π− )p, and n(γ*, π 0)n, from threshold up to W = 1.575 GeV are used to perform a single energy partial wave analysis. As a constraint, higher partial waves are taken from the MAID07 model and lower partial waves are fitted. It is demonstrated that truncated partial wave analysis in a full isospin can be obtained with this procedure. The results for photon virtuality Q 2 = 0.5 GeV2 are presented. Electromagnetic Eℓ± , Mℓ± , and longitudinal Lℓ± multipoles are presented and discussed. In the first step, numerical data are generated, and the optimal number of lower partial waves required for a good data fit is determined. In the second step, the same procedure is applied using generated pseudo data.

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Each single-energy, single-channel partial-wave analysis is inherently model-dependent

Švarc

2021

Phys. Rev. C

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Single-energy partial wave analysis for π0 photoproduction on the proton with fixed- t analyticity imposed

Cited by 9 publications

References 47 publications

Is the pole content of each single-energy, single-channel partial wave analysis inherently model dependent?

Is the pole content of each single-energy, single-channel partial wave analysis inherently model dependent?

Truncated partial-wave analysis in pion-electroproduction

Each single-energy, single-channel partial-wave analysis is inherently model-dependent

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