Hadronic light-by-light scattering amplitudes from lattice QCD versus dispersive sum rules
- Publication type:
- Journal article
- Metadata:
-
- Autoren
- Antoine Gerardin
- Jeremy Green
- Oleksii Gryniuk
- Georg von Hippel
- Harvey B Meyer
- Vladimir Pascalutsa
- Hartmut Wittig
- Autoren-URL
- https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000446298100002&DestLinkType=FullRecord&DestApp=WOS_CPL
- DOI
- 10.1103/PhysRevD.98.074501
- eISSN
- 2470-0029
- Externe Identifier
- Clarivate Analytics Document Solution ID: GV7IX
- ISSN
- 2470-0010
- Ausgabe der Veröffentlichung
- 7
- Zeitschrift
- PHYSICAL REVIEW D
- Artikelnummer
- ARTN 074501
- Datum der Veröffentlichung
- 2018
- Status
- Published
- Titel
- Hadronic light-by-light scattering amplitudes from lattice QCD versus dispersive sum rules
- Sub types
- Article
- Ausgabe der Zeitschrift
- 98
Data source: Web of Science (Lite)
- Other metadata sources:
-
- Autoren
- Antoine Gérardin
- Jeremy Green
- Oleksii Gryniuk
- Georg von Hippel
- Harvey B Meyer
- Vladimir Pascalutsa
- Hartmut Wittig
- DOI
- 10.1103/physrevd.98.074501
- eISSN
- 2470-0029
- ISSN
- 2470-0010
- Ausgabe der Veröffentlichung
- 7
- Zeitschrift
- Physical Review D
- Sprache
- en
- Artikelnummer
- 074501
- Online publication date
- 2018
- Status
- Published online
- Herausgeber
- American Physical Society (APS)
- Herausgeber URL
- http://dx.doi.org/10.1103/physrevd.98.074501
- Datum der Datenerfassung
- 2018
- Titel
- Hadronic light-by-light scattering amplitudes from lattice QCD versus dispersive sum rules
- Ausgabe der Zeitschrift
- 98
Data source: Crossref
- Abstract
- The hadronic contribution to the eight forward amplitudes of light-by-light scattering ($\gamma^*\gamma^*\to \gamma^*\gamma^*$) is computed in lattice QCD. Via dispersive sum rules, the amplitudes are compared to a model of the $\gamma^*\gamma^*\to {\rm hadrons}$ cross sections in which the fusion process is described by hadronic resonances. Our results thus provide an important test for the model estimates of hadronic light-by-light scattering in the anomalous magnetic moment of the muon, $a_\mu^{\rm HLbL}$. Using simple parametrizations of the resonance $M\to \gamma^*\gamma^*$ transition form factors, we determine the corresponding monopole and dipole masses by performing a global fit to all eight amplitudes. Together with a previous dedicated calculation of the $\pi^0\to \gamma^*\gamma^*$ transition form factor, our calculation provides valuable information for phenomenological estimates of $a_\mu^{\rm HLbL}$. The presented calculations are performed in two-flavor QCD with pion masses extending down to 190\,MeV at two different lattice spacings. In addition to the fully connected Wick contractions, on two lattice ensembles we also compute the (2+2) disconnected class of diagrams, and find that their overall size is compatible with a parameter-free, large-$N$ inspired prediction, where $N$ is the number of colors. Motivated by this observation, we estimate in the same way the disconnected contribution to $a_\mu^{\rm HLbL}$.
- Autoren
- Antoine Gérardin
- Jeremy Green
- Oleksii Gryniuk
- Georg von Hippel
- Harvey B Meyer
- Vladimir Pascalutsa
- Hartmut Wittig
- Autoren-URL
- http://arxiv.org/abs/1712.00421v1
- Zeitschrift
- Phys. Rev. D
- Schlüsselwörter
- hep-lat
- hep-lat
- hep-ph
- Notes
- 41 pages, 10 figures with up to 8 panels
- Paginierung
- 074501
- Datum der Veröffentlichung
- 2017
- Herausgeber URL
- http://dx.doi.org/10.1103/PhysRevD.98.074501
- Datum der Datenerfassung
- 2017
- Datum, an dem der Datensatz öffentlich gemacht wurde
- 2017
- Titel
- Hadronic light-by-light scattering amplitudes from lattice QCD versus dispersive sum rules
- Ausgabe der Zeitschrift
- 98
Files
1712.00421v1.pdf
Data source: arXiv
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