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Local two-photon couplings and the J=0 fixed pole in real and virtual Compton scattering

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dc.contributor.authorLlanes Estrada, Felipe José
dc.contributor.authorBrodsky, Stanley J
dc.contributor.authorSzczepaniak, Adam P
dc.date.accessioned2023-06-20T03:35:19Z
dc.date.available2023-06-20T03:35:19Z
dc.date.issued2009-02
dc.description© 2009 The American Physical Society.
dc.description.abstractThe local coupling of two photons to the fundamental quark currents of a hadron gives an energy-independent contribution to the Compton amplitude proportional to the charge squared of the struck quark, a contribution which has no analog in hadron scattering reactions. We show that this local contribution has a real phase and is universal, giving the same contribution for real or virtual Compton scattering for any photon virtuality and skewness at fixed momentum transfer squared t. The t dependence of this J=0 fixed Regge pole is parameterized by a yet unmeasured even charge conjugation form factor of the target nucleon. The t=0 limit gives an important constraint on the dependence of the nucleon mass on the quark mass through the Weisberger relation. We discuss how this 1/x form factor can be extracted from high-energy deeply virtual Compton scattering and examine predictions given by models of the H generalized parton distribution.
dc.description.departmentDepto. de Física Teórica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/22788
dc.identifier.doi10.1103/PhysRevD.79.033012
dc.identifier.issn1550-7998
dc.identifier.officialurlhttp://dx.doi.org/10.1103/PhysRevD.79.033012
dc.identifier.relatedurlhttp://prd.aps.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/43970
dc.issue.number3
dc.journal.titlePhysical Review D
dc.language.isoeng
dc.publisherAmerical Physical Society
dc.rights.accessRightsopen access
dc.subject.cdu53
dc.subject.keywordGeneralized Parton Distributions
dc.subject.keywordHard Exclusive Processes
dc.subject.keywordLarge-Momentum-Transfer
dc.subject.keywordForm- Actors
dc.subject.keywordQuantum Chromodynamics
dc.subject.keywordProton-Antiproton
dc.subject.keywordPair Production
dc.subject.keywordModel
dc.subject.keywordQcd
dc.subject.keywordPhenomenology
dc.subject.ucmFísica (Física)
dc.subject.unesco22 Física
dc.titleLocal two-photon couplings and the J=0 fixed pole in real and virtual Compton scattering
dc.typejournal article
dc.volume.number79
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