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Dispersion relation for hadronic light-by-light scattering and the muon g-2

The largest uncertainties in the Standard Model calculation of the anomalous magnetic moment of the muon $(g-2)_\mu$ come from hadronic contributions. In particular, it can be expected that in a few years the subleading hadronic light-by-light (HLbL) contribution will dominate the theory uncertainty...

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Detalles Bibliográficos
Autores principales: Colangelo, Gilberto, Stoffer, Peter, Hoferichter, Martin, Procura, Massimiliano
Lenguaje:eng
Publicado: SISSA 2016
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.253.0008
http://cds.cern.ch/record/2264480
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author Colangelo, Gilberto
Stoffer, Peter
Hoferichter, Martin
Procura, Massimiliano
author_facet Colangelo, Gilberto
Stoffer, Peter
Hoferichter, Martin
Procura, Massimiliano
author_sort Colangelo, Gilberto
collection CERN
description The largest uncertainties in the Standard Model calculation of the anomalous magnetic moment of the muon $(g-2)_\mu$ come from hadronic contributions. In particular, it can be expected that in a few years the subleading hadronic light-by-light (HLbL) contribution will dominate the theory uncertainty. We present a dispersive description of the HLbL tensor, which is based on unitarity, analyticity, crossing symmetry, and gauge invariance. Such a model-independent approach opens up an avenue towards a data-driven determination of the HLbL contribution to $(g-2)_\mu$. The dispersive approach defines unambiguously the pion-pole and the pion-box contribution to the HLbL tensor. Using Mandelstam’s double-spectral representation, we have proven that the pion-box contribution coincides exactly with the one-loop scalar QED amplitude, multiplied by the appropriate pion vector form factors.
id oai-inspirehep.net-1444556
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
publisher SISSA
record_format invenio
spelling oai-inspirehep.net-14445562019-10-15T15:27:27Zdoi:10.22323/1.253.0008http://cds.cern.ch/record/2264480engColangelo, GilbertoStoffer, PeterHoferichter, MartinProcura, MassimilianoDispersion relation for hadronic light-by-light scattering and the muon g-2Particle Physics - PhenomenologyThe largest uncertainties in the Standard Model calculation of the anomalous magnetic moment of the muon $(g-2)_\mu$ come from hadronic contributions. In particular, it can be expected that in a few years the subleading hadronic light-by-light (HLbL) contribution will dominate the theory uncertainty. We present a dispersive description of the HLbL tensor, which is based on unitarity, analyticity, crossing symmetry, and gauge invariance. Such a model-independent approach opens up an avenue towards a data-driven determination of the HLbL contribution to $(g-2)_\mu$. The dispersive approach defines unambiguously the pion-pole and the pion-box contribution to the HLbL tensor. Using Mandelstam’s double-spectral representation, we have proven that the pion-box contribution coincides exactly with the one-loop scalar QED amplitude, multiplied by the appropriate pion vector form factors.SISSAoai:inspirehep.net:14445562016
spellingShingle Particle Physics - Phenomenology
Colangelo, Gilberto
Stoffer, Peter
Hoferichter, Martin
Procura, Massimiliano
Dispersion relation for hadronic light-by-light scattering and the muon g-2
title Dispersion relation for hadronic light-by-light scattering and the muon g-2
title_full Dispersion relation for hadronic light-by-light scattering and the muon g-2
title_fullStr Dispersion relation for hadronic light-by-light scattering and the muon g-2
title_full_unstemmed Dispersion relation for hadronic light-by-light scattering and the muon g-2
title_short Dispersion relation for hadronic light-by-light scattering and the muon g-2
title_sort dispersion relation for hadronic light-by-light scattering and the muon g-2
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.22323/1.253.0008
http://cds.cern.ch/record/2264480
work_keys_str_mv AT colangelogilberto dispersionrelationforhadroniclightbylightscatteringandthemuong2
AT stofferpeter dispersionrelationforhadroniclightbylightscatteringandthemuong2
AT hoferichtermartin dispersionrelationforhadroniclightbylightscatteringandthemuong2
AT procuramassimiliano dispersionrelationforhadroniclightbylightscatteringandthemuong2