Journal
PHYSICAL REVIEW D
Volume 100, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.100.014510
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Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [HI 2048/1-1]
- DFG [SFB 1044]
- Cluster of Excellence Precision Physics, Fundamental Interactions, and Structure of Matter - DFG within the German Excellence Strategy [PRISMA + EXC 2118/1, 39083149]
- Gauss Centre for Supercomputing e. V.11
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The comparison of the theoretical and experimental determinations of the anomalous magnetic moment of the muon (g - 2)(mu) constitutes one of the strongest tests of the Standard Model at low energies. We compute the leading hadronic contribution to (g - 2)(mu) using lattice QCD simulations employing Wilson quarks. Gauge field ensembles at four different lattice spacings and several values of the pion mass down to its physical value are used. We apply the O(a) improvement program with two discretizations of the vector current to better constrain the approach to the continuum limit. The electromagnetic current correlators are computed in the time-momentum representation. In addition, we perform auxiliary calculations of the pion form factor at timelike momenta in order to better constrain the tail of the isovector correlator and to correct its dominant finite-size effect. For the numerically dominant light-quark contribution, we rescale the lepton mass by the pion decay constant computed on each lattice ensemble. We perform a combined chiral and continuum extrapolation to the physical point, and our final result is a(mu)(hvp) = (720.0 +/- 12.4(stat) +/- 9.9(syst)) x 10(-10). It contains the contributions of quark-disconnected diagrams, and the systematic error has been enlarged to account for the missing isospin-breaking effects.
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