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First results on QCD+QED with C* boundary conditions

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arxiv 2209.13183 v1 pith:ZXS4UG6I submitted 2022-09-27 hep-lat

Lucius Bushnaq , Isabel Campos , Marco Catillo , Alessandro Cotellucci , Madeleine Dale , Patrick Fritzsch , Jens Lücke , Marina Krstić Marinković
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Agostino Patella Nazario Tantalo
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classification hep-lat
keywords boundaryconditionsensemblesgaugecorrectionslatticestaraccounting
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Accounting for isospin-breaking corrections is critical for achieving subpercent precision in lattice computations of hadronic observables. A way to include QED and strong-isospin-breaking corrections in lattice QCD calculations is to impose C$^\star$ boundary conditions in space. Here, we demonstrate the computation of a selection of meson and baryon masses on two QCD and five QCD+QED gauge ensembles in this setup, which preserves locality, gauge and translational invariance all through the calculation. The generation of the gauge ensembles is performed for two volumes, and three different values of the renormalized fine-structure constant at the U-symmetric point, corresponding to the SU(3)-symmetric QCD in the two ensembles where the electromagnetic coupling is turned off. We also present our tuning strategy and, to the extent possible, a cost analysis of the simulations with C$^\star$ boundary conditions.

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Cited by 4 Pith papers

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  1. Perturbative quantum electrodynamics with generalized domain wall fermions

    hep-lat 2026-07 conditional novelty 6.0 of 10

    For generalized domain-wall fermions, the O(e^2) electromagnetic expansion requires new local seagull and anti-quark contact vertices, derived here for the first time.

  2. Partially connected contributions to baryon masses in QCD+QED

    hep-lat 2025-02 conditional novelty 5.0 of 10

    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.

  3. $O(a)$-improved QCD+QED Wilson Dirac operator on GPUs

    hep-lat 2025-02 conditional novelty 5.0 of 10

    The authors ported openQxD's QCD+QED Dirac solver to GPUs via QUDA and measured a significant speed-up with good weak scaling on up to 512 GPUs.

  4. Baryon masses with C-periodic boundary conditions

    hep-lat 2026-02 conditional novelty 4.0 of 10

    First numerical estimates of the C-periodic 1-q connected contributions to the Omega-minus two-point function, plus preliminary proton and Omega masses at m_pi ~ 400 MeV.

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