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Towards leading isospin breaking effects in mesonic masses with O(a) improved Wilson fermions

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arxiv 1710.06801 v1 pith:CILVBIPW submitted 2017-10-18 hep-lat

Towards leading isospin breaking effects in mesonic masses with O(a) improved Wilson fermions

classification hep-lat
keywords isospinmassesbreakingeffectsfermionsimprovedleadingmesonic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present an exploratory study of leading isospin breaking effects in mesonic masses using $O(a)$ improved Wilson fermions. Isospin symmetry is explicitly broken by distinct masses and electric charges of the up and down quarks. In order to be able to make use of existing isosymmetric QCD gauge ensembles we apply reweighting techniques. The path integral describing QCD+QED is expanded perturbatively in powers of the light quarks' mass deviations and the electromagnetic coupling. We employ QED$_{\mathrm{L}}$ as a finite volume formulation of QED.

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