Estimate of the hadronic vacuum polarization disconnected contribution to the anomalous magnetic moment of the muon from lattice QCD
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2016Access:
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Chakraborty B, Davies C.T.H, Koponen J, Lepage G.P, Peardon M.J, Ryan S.M, Estimate of the hadronic vacuum polarization disconnected contribution to the anomalous magnetic moment of the muon from lattice QCD, Physical Review D - Particles, Fields, Gravitation and Cosmology, 93, 7, 2016, 074509Download Item:
Abstract:
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 at one value of the lattice spacing and
an unphysically heavy value of the
u=d
quark mass. We use HPQCD
’
s method of determining the
anomalous magnetic moment by reconstructing the Adler function from time moments of the current-
current correlator at zero spatial momentum. Our results lead to a total (including
u
,
d
and
s
quarks) quark-
line disconnected contribution to
a
μ
of
−
0
.
15%
of the
u=d
hadronic vacuum polarization contribution with
an uncertainty which is 1% of that contribution.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
1-RFP.1-PHY-3201
Author's Homepage:
http://people.tcd.ie/ryansinhttp://people.tcd.ie/peardonm
Description:
PUBLISHEDCited By :3 Export Date: 6 January 2017
Author: RYAN, SINEAD; PEARDON, MICHAEL
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Journal ArticleSeries/Report no:
Physical Review D - Particles, Fields, Gravitation and Cosmology93
7
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Full text availableKeywords:
quark-line disconnected diagramDOI:
http://dx.doi.org/10.1103/PhysRevD.93.074509Metadata
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