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Beam-helicity asymmetry in associated electroproduction of real photons ep to eγ π N in the Delta-resonance region

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arxiv 1310.5081 v2 pith:VUMYV6OM submitted 2013-10-18 hep-ex nucl-ex

Beam-helicity asymmetry in associated electroproduction of real photons ep to eγ π N in the Delta-resonance region

classification hep-ex nucl-ex
keywords asymmetrygammaamplitudesassociatedbeam-helicitydeltaelectroproductionphotons
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The beam-helicity asymmetry in associated electroproduction of real photons, $ep\to e\gamma \pi N$, in the $\Delta$(1232)-resonance region is measured using the longitudinally polarized HERA positron beam and an unpolarized hydrogen target. Azimuthal Fourier amplitudes of this asymmetry are extracted separately for two channels, $ep\to e\gamma \pi^0 p$ and $ep\to e\gamma \pi^+ n$, from a data set collected with a recoil detector. All asymmetry amplitudes are found to be consistent with zero.

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