Polarization Phenomena in Small-Angle Photoproduction of e+e- Pairs and the Gerasimov-Drell-Hearn Sum Rule

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dc.creatorL'vov, A. I.
dc.creatorScopetta, S.
dc.creatorDrechsel, D.
dc.creatorScherer, S.
dc.date1997-07-03
dc.date.accessioned2026-07-07T11:11:16Z
dc.date.available2026-07-07T11:11:16Z
dc.descriptionPhotoproduction of $e^+e^-$ pairs at small angles is investigated as a tool to determine the functions $f_1$ and $f_2$ entering the real-photon forward Compton scattering amplitude. The method is based on an interference of the Bethe-Heitler and the virtual Compton scattering mechanisms, generating an azimuthal asymmetry in the $e^+$ versus $e^-$ yield. The general case of a circularly polarized beam and a longitudinally polarized target allows one to determine both the real and imaginary parts of $f_1$ as well as $f_2$. The imaginary part of $f_2$ requires target polarization only. We calculate cross sections and asymmetries of the reaction $p(γ,e^+e^-)p$, estimate corrections and backgrounds, and propose suitable kinematical regions to perform the experiment. Our investigation shows that photoproduction of $e^+e^-$-pairs off the proton and light nuclei may serve as a rather sensitive test of the validity of the Gerasimov-Drell-Hearn sum rule.
dc.description22 pages; revtex; 5 postscript figures included in submission; submitted to Phys. Rev. C
dc.identifierhttps://arxiv.org/abs/nucl-th/9707006
dc.identifierhttp://arxiv.org/abs/nucl-th/9707006
dc.identifierPhys.Rev.C57:312-321,1998
dc.identifierdoi:10.1103/PhysRevC.57.312
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191042
dc.subjectNuclear Theory
dc.titlePolarization Phenomena in Small-Angle Photoproduction of e+e- Pairs and the Gerasimov-Drell-Hearn Sum Rule
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