Novel evaluation of the two-pion contribution to the nucleon isovector form factors

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dc.creatorBelushkin, M. A.
dc.creatorHammer, H. -W.
dc.creatorMeißner, Ulf-G.
dc.date2005-10-28
dc.date2005-12-15
dc.date.accessioned2026-07-07T11:04:51Z
dc.date.available2026-07-07T11:04:51Z
dc.descriptionWe calculate the two-pion continuum contribution to the nucleon isovector spectral functions drawing upon the new high statistics measurements of the pion form factor by the CMD-2, KLOE, and SND collaborations. The general structure of the spectral functions remains unchanged, but the magnitude increases by about 10%. Using the updated spectral functions, we calculate the contribution of the two-pion continuum to the nucleon isovector form factors and radii. We compare the isovector radii with simple rho-pole models and illustrate their strong underestimation in such approaches. Moreover, we give a convenient parametrization of the result for use in future form factor analyses.
dc.description9 pages, 2 eps figures, revtex4, CMD-2 and SND data included, conclusions unchanged, version to appear in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/hep-ph/0510382
dc.identifierhttp://arxiv.org/abs/hep-ph/0510382
dc.identifierPhys.Lett.B633:507-511,2006
dc.identifierdoi:10.1016/j.physletb.2005.12.053
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189036
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectNuclear Experiment
dc.subjectNuclear Theory
dc.titleNovel evaluation of the two-pion contribution to the nucleon isovector form factors
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