A lattice QCD+QED proceedings paper derives the one-quark connected contribution to the Omega^- two-point function under C-periodic boundary conditions and proposes a point-plus-stochastic-source strategy to compute it.
openQ*D code: a versatile tool for QCD+QED simulations
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abstract
We present the open-source package openQ*D-1.0, which has been primarily, but not uniquely, designed to perform lattice simulations of QCD+QED and QCD, with and without C* boundary conditions, and O(a) improved Wilson fermions. The use of C* boundary conditions in the spatial direction allows for a local and gauge-invariant formulation of QCD+QED in finite volume, and provides a theoretically clean setup to calculate isospin-breaking and radiative corrections to hadronic observables from first principles. The openQ*D code is based on openQCD-1.6 and NSPT-1.4. In particular it inherits from openQCD-1.6 several core features, e.g. the highly optimized Dirac operator, the locally deflated solver, the frequency splitting for the RHMC, or the 4th order OMF integrator.
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Partially connected contributions to baryon masses in QCD+QED
A lattice QCD+QED proceedings paper derives the one-quark connected contribution to the Omega^- two-point function under C-periodic boundary conditions and proposes a point-plus-stochastic-source strategy to compute it.