开放边界强子真空极化中的超前同位旋破缺效应

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-11-11 DOI:10.22323/1.363.0296

A. Risch, H. Wittig

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引用次数: 4

摘要

我们讨论了研究强子对$(g-2)_{\mu}$的贡献所需的强子真空极化中的前导同位旋断裂效应。通过围绕等对称极限展开相关函数进行计算。在具有$N_{f}=2+1$、$O(a)$改进Wilson费米子和由CLS产生的开放边界条件的规范系综上，对等对称观测值进行了计算。特别强调的是完整处理价夸克扇区中领先的同位旋破断效应所需的相关夸克断开图。我们详细讨论了考虑算子混合的QCD+QED中矢量电流的重整化。

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Leading isospin breaking effects in the hadronic vacuum polarisation with open boundaries

We discuss leading isospin breaking effects in the hadronic vacuum polarisation required for the investigation of the hadronic contribution to $(g-2)_{\mu}$. The calculation proceeds by expanding the relevant correlation functions around the isosymmetric limit. Isosymmetric observables are evaluated on gauge ensembles with $N_{f}=2+1$, $O(a)$ improved Wilson fermions and open boundary conditions generated by the CLS effort. Particular emphasis is placed on the relevant quark-disconnected diagrams required for a complete treatment of leading isospin breaking effects in the valence quark sector. We provide a detailed discussion of the renormalisation of the vector current in QCD+QED taking operator mixing into account.

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Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)

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