中文

来自格点QCD的μ子g-2强子真空极化:完整的短距离和中距离窗口

高能物理 - 格点 2025-05-16 v3 高能物理 - 实验 高能物理 - 唯象学

摘要

我们给出了μ子反常磁矩aμa_\mu中强子真空极化(HVP)贡献在短距离和中距离窗口区域的完整结果,分别占HVP对aμa_\mu总贡献的约10%和35%。特别地,我们进行了格点QCD计算,得到同位旋对称的联通和非联通贡献,以及强同位旋破缺修正。对于短距离窗口观测量,我们研究了所谓的对数增强效应以及该区域交错夸克相关的显著振荡。对于占主导的同位旋对称轻夸克联通贡献,我们得到aμll,SD(conn.)=48.139(11)stat(91)syst[92]total×1010a^{ll,\mathrm{SD}}_{\mu}(\mathrm{conn.}) = 48.139(11)_{\mathrm{stat}}(91)_{\mathrm{syst}}[92]_{\mathrm{total}} \times 10^{-10}aμll,W(conn.)=206.90(14)stat(61)syst[63]total×1010a^{ll,\mathrm{W}}_{\mu}(\mathrm{conn.}) = 206.90(14)_{\mathrm{stat}}(61)_{\mathrm{syst}}[63]_{\mathrm{total}} \times 10^{-10}。我们使用贝叶斯模型平均完全估计各个贡献间的协方差矩阵。我们对完整窗口贡献的测定为aμSD=69.05(1)stat(21)syst[21]total×1010a^{\mathrm{SD}}_{\mu} = 69.05(1)_{\mathrm{stat}}(21)_{\mathrm{syst}}[21]_{\mathrm{total}} \times 10^{-10}aμW=236.45(17)stat(83)syst[85]total×1010a^{\mathrm{W}}_{\mu} = 236.45(17)_{\mathrm{stat}}(83)_{\mathrm{syst}}[85]_{\mathrm{total}} \times 10^{-10}。这项工作是我们将HVP所有贡献计算到整体不确定度达到几个万分之一水平的持续努力的一部分。

关键词

引用

@article{arxiv.2411.09656,
  title  = {Hadronic vacuum polarization for the muon $g-2$ from lattice QCD: Complete short and intermediate windows},
  author = {Alexei Bazavov and David A. Clarke and Christine Davies and Carleton DeTar and Aida X. El-Khadra and Elvira Gámiz and Steven Gottlieb and Anthony V. Grebe and Leon Hostetler and William I. Jay and Hwancheol Jeong and Andreas S. Kronfeld and Shaun Lahert and Jack Laiho and G. Peter Lepage and Michael Lynch and Andrew T. Lytle and Craig McNeile and Ethan T. Neil and Curtis T. Peterson and James N. Simone and Jacob W. Sitison and Ruth S. Van de Water and Alejandro Vaquero},
  journal= {arXiv preprint arXiv:2411.09656},
  year   = {2025}
}

备注

v3: Updated to reflect published version, which includes minor updates to the prose in Section IV and a correction to the statistical error estimate of a^W_{\mu}. Final results unchanged