Upper bound on the hadronic light-by-light contribution to the muon g - 2.
Upper bound on the hadronic light-by-light contribution to the muon g - 2.
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强子逐光对 μ 子 g - 2 贡献的上限。
DOI：
10.1103/physrevlett.97.161801
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发表时间：
2006
影响因子：
8.6
通讯作者：
G. T. Sánchez
中科院分区：
文献类型：
--
作者：
J. Erler;G. T. Sánchez
有迹象表明，在一些电弱观测中，强子环几乎被部分子水平效应饱和。将此作为本工作的假设，我们提出了强子光对μ子异常磁矩的贡献的真正部分子水平估计，a(LBL)/(mu)（had）。我们的夸克质量的定义和值是详细的，我们的方法的简单性允许一个透明的误差估计。对于无限重的夸克，我们的处理是精确的，而对于渐近小的夸克质量，a(LBL)/(mu)（had）被高估了。内插，这意味着引用上界。我们得到a(LBL)/(mu)(had)<1.59x10；{-9} （95% c.l.）。
There are indications that hadronic loops in some electroweak observables are almost saturated by parton level effects. Taking this as the hypothesis for this work, we propose a genuine parton level estimate of the hadronic light-by-light contribution to the anomalous magnetic moment of the muon, a(LBL)/(mu)(had). Our quark mass definitions and values are motivated in detail, and the simplicity of our approach allows for a transparent error estimate. For infinitely heavy quarks our treatment is exact, while for asymptotically small quark masses a(LBL)/(mu)(had) is overestimated. Interpolating, this suggests quoting an upper bound. We obtain a(LBL)/(mu)(had)<1.59x10;{-9} (95% C.L.).