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arXiv 1001.3606hep-ph
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一般规范理论中的阿德勒函数、比约肯求和规则和α_s^4阶Crewther关系

Adler Function, Bjorken Sum Rule, and the Crewther Relation to Order alpha_s^4 in a General Gauge Theory

P. A. Baikov, K. G. Chetyrkin, J. H. Kühn

摘要:

我们首次计算了极化电子-核子散射中α_s^4阶对比约肯求和规则的贡献,以及在一般色规范群的情况下α_s^4阶对(非单重态)阿德勒函数的贡献。我们确认在相同的顺序(广义)Crewther关系,它提供了一个强有力的测试,我们以前得到的结果的正确性:QCD阿德勒功能和五圈β功能淬火QED。特别是,一个不合理的贡献成比例的zeta_3在后者的数量的外观被确认。我们得到了与有效强耦合常数相关的公度标度方程,该方程是从比约肯求和规则和α_s阶阿德勒函数^[4]推导出来的。

英文摘要:

We compute, for the first time, the order alpha_s^4 contributions to the Bjorken sum rule for polarized electron-nucleon scattering and to the (non-singlet) Adler function for the case of a generic colour gauge group. We confirm at the same order a (generalized) Crewther relation which provides a strong test of the correctness of our previously obtained results: the QCD Adler function and the five-loop beta-function in quenched QED. In particular, the appearance of an irrational contribution proportional to zeta_3 in the latter quantity is confirmed. We obtain the commensurate scale equation relating the effective strong coupling constants as inferred from the Bjorken sum rule and from the Adler function at order alpha_s^4.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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