THE ALPHA-S(3) CORRECTIONS TO THE EFFECTIVE NEUTRAL-CURRENT AND TO THE Z-DECAY RATE IN THE HEAVY TOP-QUARK LIMIT

被引：51

作者：

CHETYRKIN, KG ^{[1
]}

TARASOY, OV ^{[1
]}

机构：

[1] UNIV BIELEFELD,FAK PHYS,D-33615 BIELEFELD,GERMANY

来源：

PHYSICS LETTERS B | 1994年 / 327卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(94)91538-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We find the effective neutral current in the heavy top quark limit up to and including the terms of order alpha(s)3. The result is then employed to compute the correction of the same order to the axial part of the Z decay rate into hadrons (GAMMA(Z)h) induced by the top-bottom quark mass splitting. The calculations confirm the prediction made in a previous work of K.G. Ch. and J.H. Kuhn (Phys. Lett. B 308 (1993) 127), namely, the effect of the singlet corrections of order alpha(s)3 to the axial part of the GAMMA(Z)h should not exceed 25%-30% (depending on the values chosen for alpha(s) (M(Z)) and m(t)) of the magnitude of the leading (singlet) alpha(s)2 term.

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页码：114 / 122

页数：9

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