Kinoshita T, Nio M
Laboratory for Elementary Particle Physics, Cornell University, Ithaca, New York 14853, USA.
Phys Rev Lett. 2003 Jan 17;90(2):021803. doi: 10.1103/PhysRevLett.90.021803.
The alpha(4) contribution to the lepton g-2 from a gauge-invariant set of 18 Feynman diagrams containing a light-by-light scattering subdiagram internally has been reevaluated by a method independent of the previous approach. Comparison of two methods revealed a program error in the first version. Correcting this error, the contributions of these 18 diagrams become -0.990 72(10)(alpha/pi)(4) and -4.432 43(58)(alpha/pi)(4) for the electron and muon g-2, respectively. The correction is not large enough to affect the comparison between theory and experiment for the muon g-2, but it does alter the inferred value for the fine structure constant alpha(-1) by 6 ppb.
通过一种独立于先前方法的方式，对包含内部轻子-轻子散射子图的18个规范不变费曼图对轻子g-2的α(4)贡献进行了重新评估。两种方法的比较揭示了第一个版本中的程序错误。纠正此错误后，对于电子和μ子的g-2，这18个图的贡献分别变为-0.990 72(10)(α/π)(4)和-4.432 43(58)(α/π)(4)。该修正不足以影响μ子g-2的理论与实验比较，但它确实使精细结构常数α(-1)的推断值改变了6 ppb。
