Efficiently unquenching QCD+QED at O(α)

Tim Harris*, Vera Gülpers, Antonin Portelli, James Richings

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

We outline a strategy to efficiently include the electromagnetic interactions of the sea quarks in QCD+QED. When computing iso-spin breaking corrections to hadronic quantities at leading order in the electromagnetic coupling, the sea-quark charges result in quark-line disconnected diagrams which are challenging to compute precisely. An analysis of the variance of stochastic estimators for the relevant traces of quark propagators helps us to improve the situation for certain flavour combinations and space-time decompositions. We present preliminary numerical results for the variances of the corresponding contributions using an ensemble of Nf = 2 + 1 domain-wall fermions generated by the RBC/UKQCD collaboration.

Original languageEnglish
Title of host publicationProceedings of Science
PublisherSissa Medialab Srl
Number of pages9
Publication statusPublished - 6 Apr 2023
Event39th International Symposium on Lattice Field Theory, LATTICE 2022 - Bonn, Germany
Duration: 8 Aug 202213 Aug 2022
Conference number: 39

Publication series

NameProceedings of Science
PublisherSissa Medialab Srl
ISSN (Print)1824-8039


Conference39th International Symposium on Lattice Field Theory, LATTICE 2022
Internet address


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