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Neutral Pion Electroproduction in the Resonance Region at High Q²

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arxiv 0906.2839 v2 pith:NSZ4W5JE submitted 2009-06-16 nucl-ex hep-ex

Neutral Pion Electroproduction in the Resonance Region at High Q²

classification nucl-ex hep-ex
keywords primedeltaelectromagneticprocessregionresonancealongbackground
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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