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Hadronic-vacuum-polarization contribution to the muon's anomalous magnetic moment from four-flavor lattice QCD.
- Source :
-
Physical Review D: Particles, Fields, Gravitation & Cosmology . Feb2020, Vol. 101 Issue 3, p1-1. 1p. - Publication Year :
- 2020
-
Abstract
- We calculate the contribution to the muon anomalous magnetic moment hadronic vacuum polarization from the connected diagrams of up and down quarks, omitting electromagnetism. We employ QCD gauge-field configurations with dynamical u, d, s, and c quarks and the physical pion mass, and analyze five ensembles with lattice spacings ranging from a≈0.06 to 0.15 fm. The up- and down-quark masses in our simulations have equal masses ml. We obtain, in this world where all pions have the mass of the π0, 1010allμ(conn.)=637.8(8.8), in agreement with independent lattice-QCD calculations. We then combine this value with published lattice-QCD results for the connected contributions from strange, charm, and bottom quarks, and an estimate of the uncertainty due to the fact that our calculation does not include strong-isospin breaking, electromagnetism, or contributions from quark-disconnected diagrams. Our final result for the total O(α²) hadronic-vacuum polarization to the muon's anomalous magnetic moment is 1010aHVP,LOμ=699(15)u,d(1)s,c,b, where the errors are from the light-quark and heavy-quark contributions, respectively. Our result agrees with both ab-initio lattice-QCD calculations and phenomenological determinations from experimental e+e--scattering data. It is 1.3σ below the "no new physics" value of the hadronic-vacuum-polarization contribution inferred from combining the BNL E821 measurement of aμ with theoretical calculations of the other contributions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 24700010
- Volume :
- 101
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Physical Review D: Particles, Fields, Gravitation & Cosmology
- Publication Type :
- Periodical
- Accession number :
- 142055536
- Full Text :
- https://doi.org/10.1103/PhysRevD.101.034512