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Short-distance constraints for the HLbL contribution to the muon anomalous magnetic moment

Bijnens, Johan ; Hermansson-Truedsson, Nils ; Rodríguez-Sánchez, Antonio

Physics letters. B, 2019-11, Vol.798, p.134994, Article 134994 [Periódico revisado por pares]

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Título:
Short-distance constraints for the HLbL contribution to the muon anomalous magnetic moment
Autor: Bijnens, Johan ; Hermansson-Truedsson, Nils ; Rodríguez-Sánchez, Antonio
Assuntos: Fysik ; Natural Sciences ; Naturvetenskap ; Physical Sciences ; Subatomic Physics ; Subatomär fysik
É parte de: Physics letters. B, 2019-11, Vol.798, p.134994, Article 134994
Descrição: We derive short-distance constraints for the hadronic light-by-light contribution (HLbL) to the anomalous magnetic moment of the muon in the kinematic region where the three virtual momenta are all large. We include the external soft photon via an external field leading to a well-defined Operator Product Expansion. We establish that the perturbative quark loop gives the leading contribution in a well defined expansion. We compute the first nonzero power correction. It is related to the magnetic susceptibility of the QCD vacuum. The results can be used as model-independent short-distance constraints for the very many different approaches to the HLbL contribution. Numerically the power correction is found to be small.
Editor: Elsevier B.V
Idioma: Inglês

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