The hadronic vacuum polarization contribution to aμ from full lattice QCD
نویسندگان
چکیده
منابع مشابه
Estimate of the hadronic vacuum polarization disconnected contribution to the anomalous magnetic moment of the muon from lattice QCD
The quark-line disconnected diagram is a potentially important ingredient in lattice QCD calculations of the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon. It is also a notoriously difficult one to evaluate. Here, for the first time, we give an estimate of this contribution based on lattice QCD results that have a statistically significant signal, albeit...
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Using only independent high-scale OPE input, we investigate QCD sum rule constraints on two currently incompatible versions of the isovector vector spectral function, one obtained from electroproduction (EM) data, the other from hadronic τ decay data. Sum rules involving weighted integrals over the spectral function, from threshold to a variable upper endpoint s0, are employed. It is shown that...
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The anomalous magnetic moment of the muon, aμ, is now known to fantastic precision, both experimentally and theoretically. This situation naturally provides an interesting test of the Standard Model. The largest uncertainty in the calculation of aμ is associated with hadronic contributions; the lowest order in α contribution arises from the hadronic vacuum polarization of the photon. Using the ...
متن کاملCalculation of the Hadronic Vacuum Polarization Disconnected Contribution to the Muon Anomalous Magnetic Moment.
We report the first lattice QCD calculation of the hadronic vacuum polarization (HVP) disconnected contribution to the muon anomalous magnetic moment at physical pion mass. The calculation uses a refined noise-reduction technique that enables the control of statistical uncertainties at the desired level with modest computational effort. Measurements were performed on the 48^{3}×96 physical-pion...
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The two-pion contribution to hadronic vacuum polarization can be extracted from τ decay data when isospin violating and radiative corrections are taken into account. When the dominant corrections are applied to the photon-inclusive decay τ− → ντπ π[γ], one obtains a shift ∆aμ = (−12.0± 2.6)× 10 −10 for the anomalous magnetic moment of the muon. The shift appears to be too small to reconcile the...
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