ORCID
- C. McNeile: 0000-0003-0305-2028
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 $a_\mu^{\rm HVP}$ for the first time with physical values of $m_u$ and $m_d$ 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 $\delta a_\mu^{{\rm HVP,} m_u \neq m_d}$= +1.5(4)\%, in agreement with estimates from phenomenology and a recent lattice-QCD calculation with unphysically heavy pions.
Publication Date
2018-04-12
Publication Title
Physical Review Letters
ISSN
0031-9007
Embargo Period
2018-06-15
Keywords
hep-lat, hep-ph
Recommended Citation
Chakraborty, B., Davies, C., Detar, C., El-Khadra, A., Gámiz, E., Gottlieb, S., Hatton, D., Koponen, J., Kronfeld, A., Laiho, J., Lepage, G., Liu, Y., Mackenzie, P., McNeile, C., Neil, E., Simone, J., Sugar, R., Toussaint, D., Water, R., & Vaquero, A. (2018) 'Strong-isospin-breaking correction to the muon anomalous magnetic moment from lattice QCD at the physical point', Physical Review Letters, . Available at: 10.1103/PhysRevLett.120.152001
