QED and strong isospin corrections in the hardonic vacuum polarization contribution to the anomalous magnetic moment of the muon
Proceedings of The 38th International Symposium on Lattice Field Theory — PoS(LATTICE2021)(2022)
摘要
Recently, the Budapest-Marseille-Wuppertal collaboration achieved sub-percent precision in the evaluation of the lowest-order hadronic vacuum polarization contribution to the muon $g_\mu-2$ (arXiv:hep-lat/2002.12347v3). At this level of precision, isospin-symmetric QCD is not sufficient. In this contribution we review how QED and strong-isospin-breaking effects have been included in our work. Isospin breaking is implemented by expanding the relevant correlation functions to second order in the electric charge $e$ and to first order in $m_u-m_d$. The correction terms are then computed using isospin-symmetric configurations. The choice of this approach allows us to better distribute the available computing resources among the various contributions.
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关键词
hadronic vacuum polarization
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