Eliminating the hadronic uncertainty.
Eliminating the hadronic uncertainty.
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消除强子不确定性。
DOI：
10.1103/physrevd.52.1655
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Robin G. Stuart
中科院分区：
文献类型：
--
作者：
Robin G. Stuart
标准拉格朗日模型需要费米子质量、希格斯玻色子质量和其他三个经过实验充分测量的量的值作为输入，以便进行预测。这些通常被视为 {alpha}、{ital G}{sub {mu}} 和 {ital M}{sub {ital Z}}。然而，使用第一个方法会引入强子贡献，从而导致重大错误。如果可以找到一个在高能量下以足够精度测量的量，那么它可以用来代替 {alpha} 作为输入。发生这种情况所需的精度水平是针对许多精确测量的可观测值给出的。 {ital W} 玻色子质量的测量误差必须为 {plus_minus}13 MeV，{Gamma}{sub {ital Z}} 为 0.7 MeV，偏振不对称性 {ital A}{sub {ital L}{ital R}} 为 {plus_minus}0.002，这似乎是最有希望的候选者。回顾了重整化参数在微扰计算中的作用，得到与所有实验数据一致的M{bar S}重整化格式中的电磁耦合常数值为{alpha}{sub M}{bar S}{sup {minus}1}({ital M}{sub {ital Z}}{sup 2})=128.17。
The standard model Lagrangian requires the values of the fermion masses, the Higgs boson mass, and three other experimentally well-measured quantities as input in order to become predictive. These are typically taken to be {alpha}, {ital G}{sub {mu}}, and {ital M}{sub {ital Z}}. Using the first of these, however, introduces a hadronic contribution that leads to a significant error. If a quantity could be found that was measured at high energy with sufficient precision then it could be used to replace {alpha} as input. The level of precision required for this to happen is given for a number of precisely measured observables. The {ital W} boson mass must be measured with an error of {plus_minus}13 MeV, {Gamma}{sub {ital Z}} to 0.7 MeV, and polarization asymmetry {ital A}{sub {ital L}{ital R}} to {plus_minus}0.002 that would seem to be the most promising candidate. The role of renormalized parameters in perturbative calculations is reviewed and the value for the electromagnetic coupling constant in the M{bar S} renormalization scheme that is consistent with all experimental data is obtained to be {alpha}{sub M}{bar S}{sup {minus}1}({ital M}{sub {ital Z}}{sup 2})=128.17.