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      Neutral Pion Electroproduction in the Resonance Region at High \(Q^2\)

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          Abstract

          The process \(ep \to e^{\prime}p^{\prime}\pi^0\) has been measured at \(Q^2\) = 6.4 and 7.7 GeV/c\(^2\))\(^2\) in Jefferson Lab's Hall C. Unpolarized differential cross sections are reported in the virtual photon-proton center of mass frame considering the process \(\gamma^{\ast}p \to p^{\prime}\pi^0\). Various details relating to the background subtractions, radiative corrections and systematic errors are discussed. The usefulness of the data with regard to the measurement of the electromagnetic properties of the well known \(\Delta(1232)\) resonance is covered in detail. Specifically considered are the electromagnetic and scalar-magnetic ratios \(R_{EM}\) and \(R_{SM}\) along with the magnetic transition form factor \(G_M^{\ast}\). It is found that the rapid fall off of the \(\Delta(1232)\) contribution continues into this region of momentum transfer and that other resonances

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          Most cited references 7

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          Radiative Corrections to Elastic and InelasticepandupScattering

           L. Mo,  Y-S Tsai (1969)
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            High Energy Elastic Scattering of Electrons on Protons

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              Application of Dispersion Relations to Low-Energy Meson-Nucleon Scattering

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                Author and article information

                Journal
                15 June 2009
                2009-09-26
                Article
                10.1103/PhysRevC.80.035203
                0906.2839

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                Custom metadata
                Phys.Rev.C80:035203,2009
                41 pages including numerical cross section tables, updates include new phenomenological fit for multipole extraction in addition to simplified previous method, These fits are seen in figures 24,26 and 27 and the values are reported in Table VIII
                nucl-ex hep-ex

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