First results on QCD+QED with C* boundary conditions

Bushnaq, Lucius; Plasencia, Isabel Campos; Catillo, Marco; Cotellucci, Alessandro; Dale, Madeleine; Fritzsch, Patrick; Lücke, Jens; Marinkovic, Marina; Patella, Agostino; Tantalo, Nazario

doi:10.1007/jhep03(2023)012

Cited by 6 publications

(6 citation statements)

References 88 publications

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“…we can conclude that we have a good understanding of where the overhead comes from. Similar estimations for the other ensembles can be found in [13].…”

Section: Cost Analysissupporting

confidence: 83%

“…We have verified that we are free from the problem of topological freezing in all our ensembles, which justifies the use of periodic boundary conditions in time. More information on the setup and choice of parameters can be found in [12,13].…”

Section: Ensembles and Setupmentioning

confidence: 99%

“…Compared to [13], the major updates are three new ensembles. There are two new ones at 𝛼 0 = 1/137 on a 64 × 32 3 lattice and one at 𝛼 0 = 0.05 on a 96 × 48 3 lattice.…”

Section: Ensembles and Setupmentioning

confidence: 99%

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$N_f = 1+2+1$ QCD+QED simulations with C$^\star$ boundary conditions

Lücke¹,

Altherr²,

Bushnaq³

et al. 2023

Proceedings of the 39th International Symposium on Lattice Field Theory — PoS(LATTICE2022)

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RC C R * collaborationWe give an update on the ongoing effort of the RC ★ collaboration to generate fully dynamical QCD+QED configurations with C ★ boundary conditions using the openQ ★ D code. The simulations are tuned to the U-symmetric point (𝑚 𝑑 = 𝑚 𝑠 ) with pions at 𝑚 𝜋 ± ≈ 400 MeV. The splitting of the light mesons is used as one of three tuning observables and fixed to 𝑚 𝐾 0 − 𝑚 𝐾 ± ≈ 5 MeV and 𝑚 𝐾 0 − 𝑚 𝐾 ± ≈ 25 MeV on ensembles with renormalized electromagnetic coupling 𝛼 R ≈ 𝛼 phys. and 𝛼 R ≈ 5.5𝛼 phys. respectively. We will discuss some details concerning our tuning strategy and present the calculation of the meson and baryon masses. Finally, we will also present a cost analysis for our simulations. More technical details on finite-volume effects and the tuning can be found in A. Cotellucci's proceedings [1].

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“…we can conclude that we have a good understanding of where the overhead comes from. Similar estimations for the other ensembles can be found in [13].…”

Section: Cost Analysissupporting

confidence: 83%

Section: Ensembles and Setupmentioning

confidence: 99%

See 1 more Smart Citation

$N_f = 1+2+1$ QCD+QED simulations with C$^\star$ boundary conditions

Lücke¹,

Altherr²,

Bushnaq³

et al. 2023

Proceedings of the 39th International Symposium on Lattice Field Theory — PoS(LATTICE2022)

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“…Another recent investigation provides a systematic analysis of various finite-size effects beyond the pointlike approximation of hadrons, in particular of pseudoscalar mesons masses [87] (see also references therein). As an alternative method, first results (primarily on hadron masses) based on simulating QCD+QED with C * boundary conditions have recently been presented [88].…”

Section: Jhep03(2023)194mentioning

confidence: 99%

Forward light-by-light scattering and electromagnetic correction to hadronic vacuum polarization

Biloshytskyi

Chao

Gérardin

et al. 2023

J. High Energ. Phys.

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Lattice QCD calculations of the hadronic vacuum polarization (HVP) have reached a precision where the electromagnetic (e.m.) correction can no longer be neglected. This correction is both computationally challenging and hard to validate, as it leads to ultraviolet (UV) divergences and to sizeable infrared (IR) effects associated with the massless photon. While we precisely determine the UV divergence using the operator-product expansion, we propose to introduce a separation scale Λ ~ 400 MeV into the internal photon propagator, whereby the calculation splits into a short-distance part, regulated in the UV by the lattice and in the IR by the scale Λ, and a UV-finite long-distance part to be treated with coordinate-space methods, thereby avoiding power-law finite-size effects altogether. In order to predict the long-distance part, we express the UV-regulated e.m. correction to the HVP via the forward hadronic light-by-light (HLbL) scattering amplitude and relate the latter via a dispersive sum rule to γ∗γ∗ fusion cross-sections. Having tested the relation by reproducing the two-loop QED vacuum polarization (VP) from the tree-level γ∗γ∗→ e+e− cross-section, we predict the expected lattice-QCD integrand resulting from the γ∗γ∗→ π0 process.

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“…Since meson masses are frequently used when defining the physical point, it is important to understand QED corrections to meson masses. Several groups have recent work on this topic [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

QED corrections to meson masses

Swaim

2024

Proceedings of the 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)

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We present our progress on calculating leading-order QED corrections to meson masses and bare quark masses. As lattice QCD calculations become more precise, these QED corrections are becoming more important. However, one of the challenges in adding QED effects to QCD calculations is avoiding power-law suppressed finite-volume effects. By using the recently introduced infinite-volume reconstruction method for QED, we are able to avoid this problem and perform calculations with exponentially-suppressed finite-volume effects.

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First results on QCD+QED with C* boundary conditions

Cited by 6 publications

References 88 publications

$N_f = 1+2+1$ QCD+QED simulations with C$^\star$ boundary conditions

$N_f = 1+2+1$ QCD+QED simulations with C$^\star$ boundary conditions

Forward light-by-light scattering and electromagnetic correction to hadronic vacuum polarization

QED corrections to meson masses

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