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Coupled-channel analysis of pion- and eta-electroproduction with the J\"ulich-Bonn-Washington model

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arxiv 2111.04774 v1 pith:FLHR5EI7 submitted 2021-11-08 nucl-th hep-phnucl-ex

Coupled-channel analysis of pion- and eta-electroproduction with the J\"ulich-Bonn-Washington model

classification nucl-th hep-phnucl-ex
keywords electroproductionenergyanalysiscoupled-channeldatafitsmodelpion
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Pion and eta electroproduction data are jointly analyzed for the first time, up to a center-of-mass energy of 1.6 GeV. The framework is a dynamical coupled-channel model, based on the recent J\"ulich-Bonn-Washington analysis of pion electroproduction data for the same energy range. Comparisons are made to a number of single-channel eta electroproduction fits. By comparing multipoles of comparable fit quality, we find some of these amplitudes are well determined over the near-threshold region, while others will require fits over an extended energy range.

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