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25 April 2024 |
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The strange and charm quark contributions to the anomalous magnetic moment of the muon from lattice QCD | | Jonna Koponen
; Bipasha Chakraborty
; Christine T. H. Davies
; Gordon Donald
; Rachel Dowdall
; Pedro Goncalves de Oliveira
; G. Peter Lepage
; Thomas Teubner
; | | Date: |
3 Nov 2014 | | Abstract: | We describe a new technique (published in Phys. Rev. D89 114501) to determine
the contribution to the anomalous magnetic moment of the muon coming from the
hadronic 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 vector
current-current correlator at zero spatial momentum. We test the method using
strange quark correlators calculated on MILC Collaboration’s $n_f = 2+1+1$ HISQ
ensembles at multiple values of the lattice spacing, multiple volumes and
multiple light sea quark masses (including physical pion mass configurations).
We find the (connected) contribution to the anomalous moment from the strange
quark vacuum polarisation to be $a^s_mu=53.41(59) imes 10^{-10}$, and the
contribution from charm quarks to be $a^c_mu=14.42(39) imes 10^{-10}$ - 1%
accuracy is achieved for the strange quark contribution. The extension of our
method to the light quark contribution and to that from the quark-line
disconnected diagram is straightforward. | | Source: | arXiv, 1411.0569 | | Services: | Forum | Review | PDF | Favorites | |
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