FLAVOR SINGLET O(ALPHA(S)(2)M(B)(2)/M(T)(2)) CORRECTIONS TO THE PARTIAL DECAY-RATE GAMMA(Z-]B(B)OVER-BAR

被引：22

作者：

CHETYRKIN, KG ^{[1
]}

KWIATKOWSKI, A ^{[1
]}

机构：

[1] UNIV KARLSRUHE,INST THEORET TEILCHENPHYS,D-76128 KARLSRUHE,GERMANY

来源：

PHYSICS LETTERS B | 1993年 / 319卷 / 1-3期

关键词：

D O I：

10.1016/0370-2693(93)90818-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analytically compute the flavour singlet O(alpha(s)2m(b)2/m(t)2) radiative corrections to the partial decay rate GAMMA (Z --> bbBAR). These corrections arise from anomalous ''double triangle'' diagrams containing a single gamma5 matrix inside each of two closed fermion loops. They represent the next-to-leading term of the asymptotic expansion in the inverse large top mass. As a byproduct of the calculcation we confirm the results of B. Kniehl and J.H. Kuhn for the flavour singlet massless corrections [Phys Lett. B 224 (1990) 229; Nucl. Phys. B 329 (1990) 547] as well as our previous O(alpha(s)2m(b)2/M(Z)2) result [Phys. Lett. B 305 (1993) 285].

引用

页码：307 / 312

页数：6

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