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Forward doubly-virtual Compton scattering off the nucleon in chiral perturbation theory: The subtraction function and moments of unpolarized structure functions

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cris.virtual.author-orcid#PLACEHOLDER_PARENT_METADATA_VALUE#
cris.virtual.author-orcid#PLACEHOLDER_PARENT_METADATA_VALUE#
cris.virtual.author-orcid#PLACEHOLDER_PARENT_METADATA_VALUE#
cris.virtual.author-orcid#PLACEHOLDER_PARENT_METADATA_VALUE#
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cris.virtualsource.author-orcid96cda3c7-13de-4ad0-ab6f-9205a3c57994
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dc.contributor.authorAlarcón, Jose Manuel
dc.contributor.authorHagelstein, Franziska Elfriede
dc.contributor.authorLensky, Vadim
dc.contributor.authorPascalutsa, Vladimir
dc.date.accessioned2024-09-02T16:06:30Z
dc.date.available2024-09-02T16:06:30Z
dc.date.issued2020-07-07
dc.description.abstractThe forward doubly-virtual Compton scattering (VVCS) off the nucleon contains a wealth of information on nucleon structure, relevant to the calculation of the two-photon-exchange effects in atomic spectroscopy and electron scattering. We report on a complete next-to-leading-order (NLO) calculation of low-energy VVCS in chiral perturbation theory (χPT). Here we focus on the unpolarized VVCS amplitudes T1ðν;Q2Þ and T2ðν;Q2Þ, and the corresponding structure functions F1ðx;Q2Þ and F2ðx;Q2Þ. Our results are confronted, where possible, with “data-driven” dispersive evaluations of low- energy structure quantities, such as nucleon polarizabilities. We find significant disagreements with dispersive evaluations at very low momentum-transfer Q; for example, in the slope of polarizabilities at zero momentum transfer. By expanding the results in powers of the inverse nucleon mass, we reproduce the known “heavy-baryon” expressions. This serves as a check of our calculation, as well as demonstrates the differences between the manifestly Lorentz-invariant (BχPT) and heavy-baryon (HBχPT) frameworks.
dc.description.numberOfPages19
dc.description.sponsorshipInstitut für theoretische Physik der Universität Bern (ITP)
dc.identifier.arxiv2005.09518
dc.identifier.doi10.7892/boris.145597
dc.identifier.publisherDOI10.1103/PhysRevD.102.014006
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/36672
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.ispartofPhysical review. D - particles, fields, gravitation, and cosmology
dc.relation.issn1550-7998
dc.relation.organizationDCD5A442C6C6E17DE0405C82790C4DE2
dc.relation.organizationDCD5A442BE76E17DE0405C82790C4DE2
dc.subject.ddc500 - Science::530 - Physics
dc.titleForward doubly-virtual Compton scattering off the nucleon in chiral perturbation theory: The subtraction function and moments of unpolarized structure functions
dc.typearticle
dspace.entity.typePublication
oaire.citation.issue1
oaire.citation.startPage014006
oaire.citation.volume102
oairecerif.author.affiliation#PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliationInstitut für theoretische Physik der Universität Bern (ITP)
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unibe.date.licenseChanged2020-08-05 13:49:16
unibe.description.ispublishedpub
unibe.eprints.legacyId145597
unibe.journal.abbrevTitlePHYS REV D
unibe.refereedTRUE
unibe.subtype.articlejournal

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