Blum Thomas, Christ Norman, Hayakawa Masashi, Izubuchi Taku, Jin Luchang, Jung Chulwoo, Lehner Christoph
Physics Department, University of Connecticut, 2152 Hillside Road, Storrs, Connecticut 06269-3046, USA.
RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA.
Phys Rev Lett. 2020 Apr 3;124(13):132002. doi: 10.1103/PhysRevLett.124.132002.
We report the first result for the hadronic light-by-light scattering contribution to the muon anomalous magnetic moment with all errors systematically controlled. Several ensembles using 2+1 flavors of physical mass Möbius domain-wall fermions, generated by the RBC and UKQCD collaborations, are employed to take the continuum and infinite volume limits of finite volume lattice QED+QCD. We find a_{μ}^{HLbL}=7.87(3.06){stat}(1.77){sys}×10^{-10}. Our value is consistent with previous model results and leaves little room for this notoriously difficult hadronic contribution to explain the difference between the standard model and the BNL experiment.
我们报告了强子轻子对轻子散射对μ子反常磁矩贡献的首个结果，其中所有误差均得到系统控制。利用由RBC和UKQCD合作组生成的具有2 + 1味物理质量的莫比乌斯域壁费米子的多个系综，来取有限体积格点QED + QCD的连续统和无限体积极限。我们发现(a_{μ}^{HLbL}=7.87(3.06){统计}(1.77){系统}×10^{-10})。我们的值与先前的模型结果一致，并且几乎没有空间让这个极难的强子贡献来解释标准模型与布鲁克海文国家实验室（BNL）实验之间的差异。
