Tests of hadronic vacuum polarization fits for the muon anomalous magnetic moment
Tests of hadronic vacuum polarization fits for the muon anomalous magnetic moment
复制标题
强子真空极化拟合μ子反常磁矩的测试
DOI：
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复制
发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Peris
中科院分区：
文献类型：
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作者：
M. Golterman;K. Maltman;S. Peris
We construct a physically motivated model for the isospin-one non-strange vacuum polarization function P(Q 2 ) based on a spectral function given by vector-channel OPAL data from hadronic t decays for energies below the t mass and a successful parametrization, employing perturbation theory and a model for quark-hadron duality violations, for higher energies. Using a covariance matrix and Q 2 values from a recent lattice simulation, we then generate fake data for P(Q 2 ) and use it to test fitting methods currently employed on the lattice for extracting the hadronic vacuum polarization contribution to the muon anomalous magnetic moment. This comparison reveals a systematic error much larger than the few-percent total error sometimes claimed for such extractions in the literature. In particular, we find that errors deduced from fits using a Vector Meson Dominance ansatz are misleading, typically turning out to be much smaller than the actual discrepancy between the fit and exact model results. The use of a sequence of Pade approximants, recently advocated in the literature, appears to provide a safer fitting strategy.
影响因子：
8.6
作者：
Baikov, P. A.;Chetyrkin, K. G.;Kuehn, J. H.
通讯作者：
Kuehn, J. H.