Separated cross sections in π^0 electroproduction at threshold at Q^2 = 0.05 GeV^2/c^2

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dc.creatorWeis, M.
dc.creatorBartsch, P.
dc.creatorBaumann, D.
dc.creatorBermuth, J.
dc.creatorBernstein, A. M.
dc.creatorBohinc, K.
dc.creatorBöhm, R.
dc.creatorDing, M.
dc.creatorDistler, M. O.
dc.creatorEwald, I.
dc.creatorFriedrich, J. M.
dc.creatorFriedrich, J.
dc.creatorKahrau, M.
dc.creatorKohl, M.
dc.creatorKrygier, K. W.
dc.creatorLiesenfeld, A.
dc.creatorMerkel, H.
dc.creatorMerle, P.
dc.creatorMüller, U.
dc.creatorNeuhausen, R.
dc.creatorPavan, M. M.
dc.creatorPospischil, Th.
dc.creatorPotokar, M.
dc.creatorRosner, G.
dc.creatorSchmieden, H.
dc.creatorSeimetz, M.
dc.creatorŠirca, S.
dc.creatorWagner, A.
dc.creatorWalcher, Th.
dc.date2007-05-25
dc.date.accessioned2026-07-07T11:56:52Z
dc.date.available2026-07-07T11:56:52Z
dc.descriptionThe differential cross sections σ_0=σ_T+εσ_L, σ_{LT}, and σ_{TT} of π^0 electroproduction from the proton were measured from threshold up to an additional center of mass energy of 40 MeV, at a value of the photon four-momentum transfer of Q^2= 0.05 GeV^2/c^2 and a center of mass angle of θ=90^\circ. By an additional out-of-plane measurement with polarized electrons σ_{LT'} was determined. This showed for the first time the cusp effect above the π^+ threshold in the imaginary part of the s-wave. The predictions of Heavy Baryon Chiral Perturbation Theory are in disagreement with these data. On the other hand, the data are somewhat better predicted by the MAID phenomenological model and are in good agreement with the dynamical model DMT.
dc.description6 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0705.3816
dc.identifierhttp://arxiv.org/abs/0705.3816
dc.identifierEur.Phys.J.A38:27-33,2008
dc.identifierdoi:10.1140/epja/i2007-10644-6
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205684
dc.subjectNuclear Experiment
dc.titleSeparated cross sections in π^0 electroproduction at threshold at Q^2 = 0.05 GeV^2/c^2
dc.typetext

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