Chakraborty, B., Davies, C.T.H. , Koponen, J., Lepage, G.P., Peardon, M.J. and Ryan, S.M. (2016) Estimate of the hadronic vacuum polarization disconnected contribution to the anomalous magnetic moment of the muon from lattice QCD. Physical Review D, 93(7), 074509. (doi: 10.1103/PhysRevD.93.074509)
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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 aμ of −0.15% of the u/d hadronic vacuum polarization contribution with an uncertainty which is 1% of that contribution.
| Item Type: | Articles |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Koponen, Dr Jonna and Davies, Professor Christine |
| Authors: | Chakraborty, B., Davies, C.T.H., Koponen, J., Lepage, G.P., Peardon, M.J., and Ryan, S.M. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Physical Review D |
| Publisher: | American Physical Society |
| ISSN: | 1550-7998 |
| ISSN (Online): | 1550-2368 |
| Published Online: | 29 April 2016 |
| Copyright Holders: | Copyright © 2016 The Authors |
| First Published: | First published in Physical Review D 93(7):074509 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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