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Utilities for muon g-2 analyses in lattice QCD.

Project Description

This module contains a small number of tools useful for analyzing contributions to the muon’s magnetic moment from (lattice) QCD vacuum polarization. The general technique is described in arXiv:1403.1778. The functions or classes include:

moments(G) – compute moments of jj correlator G.

mom2taylor(G) – convert moments in G into Taylor coefficients
for q2-expansion.

taylor2mom(G) – convert Taylor expansion coefficients G into moments.

vacpol(G) – create a Pade approximant for the subtracted
vacuum polarization (PI-hat) from the jj correlator whose moments (or Taylor coefs) are in G.
a_mu(pihat, Q) – compute the contribution to the muon’s g-2
anomaly from function pihat (usually built by vacpol).
pade_gvar(f,m,n)– general-purpose code for determining Pade approximants
to a power series whose coefficients are GVars.
pade_svd(f,m,n) – general-purpose code for determining Pade approximants
for a power series whose coefficients are floats. Uses SVD regularization to stabilize results when the input data are noisy.

Release History

This version
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1.3.2

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1.3

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1.2.1

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1.2

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1.1

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1.0.1

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1.0

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Source None Feb 16, 2018

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