Nonfactorizable QCD and Electroweak Corrections to the Hadronic Z Boson Decay Rate.
Nonfactorizable QCD and Electroweak Corrections to the Hadronic Z Boson Decay Rate.
复制标题
对强子 Z 玻色子衰变率的不可分解 QCD 和电弱校正。
作者：
A. Czarnecki;J. Kuhn
我们提出了对 {ital Z} 玻色子衰变成轻夸克的双环混合 QCD 和电弱校正的分析。我们发现 QCD 和电弱校正的朴素分解不能正确描述双环效应。不可分解的修正将 {ital Z} 玻色子的宽度移动了大约 {minus}0.59(3) MeV，并将 CERN {ital e}{sup +}{ital e}{sup {minus}} 对撞机 LEP 确定的强耦合常数的中心值增加了 0.001。 {版权} {ital 1996 美国物理学会。}
We present an analysis of two-loop mixed QCD and electroweak corrections to the decay of the {ital Z} boson into light quarks. We find that the naive factorization of QCD and electroweak corrections does not describe correctly the two-loop effects. The nonfactorizable corrections shift the width of the {ital Z} boson by approximately {minus}0.59(3) MeV and increase the central value of the strong coupling constant determined at the CERN {ital e}{sup +}{ital e}{sup {minus}} collider LEP by 0.001. {copyright} {ital 1996 The American Physical Society.}