Strong-Isospin-Breaking Correction to the Muon Anomalous Magnetic Moment from Lattice QCD at the Physical Point

Fermilab Lattice, HPQCD, and MILC Collaborations

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Abstract

All lattice-QCD calculations of the hadronic-vacuum-polarization contribution to the muon's anomalous magnetic moment to date have been performed with degenerate up- and down-quark masses. Here we calculate directly the strong-isospin-breaking correction to aμHVP for the first time with physical values of mu and md and dynamical u, d, s, and c quarks, thereby removing this important source of systematic uncertainty. We obtain a relative shift to be applied to lattice-QCD results obtained with degenerate light-quark masses of δaμHVP,mu≠md=+1.5(7)%, in agreement with estimates from phenomenology.

Original languageEnglish (US)
Article number152001
JournalPhysical Review Letters
Volume120
Issue number15
DOIs
StatePublished - Apr 12 2018

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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