2-LOOP CORRECTIONS TO THE VACUUM POLARIZATIONS IN PERTURBATIVE QCD

被引：216

作者：

KNIEHL, BA

机构：

[1] Department of Physics, University of Wisconsin, Madison

来源：

NUCLEAR PHYSICS B | 1990年 / 347卷 / 1-2期

关键词：

D O I：

10.1016/0550-3213(90)90552-O

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Closed analytic expressions for the O(ααs) corrections to the vacuum polarizations of neutral gauge bosons induced by a massive quark and to those of charged bossons associated with a quark isodoublet of large mass splitting are derived through dispersive methods for variable external invariant mass s. Their small-s, high-s and threshold expansions are calculated. As an application, the tb contributions in O(ααs) to the radiative parameters Δρ{variant}(0), Δr and the oblique correction δALR to the left-right asymmetry ALR in e+e- collisions are studied. Handy approximation formulae for these corrections are presented which are valid for mt > MW and take into account the next-to-leading terms in MW/mt. © 1990.

引用

页码：86 / 104

页数：19

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