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We describe a new technique (presented in arXiv:1403.1778) to determine thecontribution to the anomalous magnetic moment (g-2) of the muon coming from thehadronic vacuum polarisation using lattice QCD. Our method uses Pad\'{e}approximants to reconstruct the Adler function from its derivatives at $q^2=0$.These are obtained simply and accurately from time-moments of the vectorcurrent-current correlator at zero spatial momentum. We test the method usingstrange quark correlators calculated on MILC Collaboration's $n_f$ = 2+1+1 HISQensembles at multiple values of the lattice spacing, multiple volumes andmultiple light sea quark masses (including physical pion mass configurations).

The strange and charm quark contributions to the anomalous magnetic moment (g -2) of the muon from current-current correlators