Two-loop QCD corrections to the heavy quark form factors: Axial vector contributions

被引：68

作者：

Bernreuther, W ^{[1
]}

Bonciani, R

Gehrmann, T

Heinesch, R

Leineweber, T

Mastrolia, P

Remiddi, E

机构：

[1] Rhein Westfal TH Aachen, Inst Theoret Phys, D-52056 Aachen, Germany

[2] Univ Freiburg, Fak Math & Phys, D-79104 Freiburg, Germany

[3] Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland

[4] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[5] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy

[6] INFN, Sez Bologna, I-40126 Bologna, Italy

来源：

NUCLEAR PHYSICS B | 2005年 / 712卷 / 1-2期

关键词：

Feynman diagrams; multi-loop calculations; vertex diagrams; heavy quarks;

D O I：

10.1016/j.nuclphysb.2005.01.035

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：

We consider the Z* Q Q vertex to order alpha(2)(S) in the QCD coupling for an on-shell massive quark-antiquark pair and for arbitrary momentum transfer of the Z boson. We present closed analytic expressions for the two parity-violating form factors of that vertex at the two-loop level in QCD, excluding the contributions from triangle diagrams. These form factors are expressed in terms of 1-dimensional harmonic polylogarithms of maximum weight 4. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：229 / 286

页数：58

共 28 条

[11]

FREITAS A, HEPPH0411304

[12] Numerical evaluation of harmonic polylogarithms [J].

Gehrmann, T ;

Remiddi, E .

COMPUTER PHYSICS COMMUNICATIONS, 2001, 141 (02) :296-312

[13] Differential equations for two-loop four-point functions [J].

Gehrmann, T ;

Remiddi, E .

NUCLEAR PHYSICS B, 2000, 580 (1-2) :485-518

[14]

JERSAK J, 1987, PHYS REV D, V36, P310, DOI 10.1103/PhysRevD.36.310.2

[15] ELECTROWEAK PRODUCTION OF HEAVY QUARKS IN E+E- ANNIHILATION [J].

JERSAK, J ;

LAERMANN, E ;

ZERWAS, PM .

PHYSICAL REVIEW D, 1982, 25 (05) :1218-1228

[16] DIFFERENTIAL-EQUATIONS METHOD - NEW TECHNIQUE FOR MASSIVE FEYNMAN DIAGRAM CALCULATION [J].

KOTIKOV, AV .

PHYSICS LETTERS B, 1991, 254 (1-2) :158-164

[17] Axial contributions at the top threshold [J].

Kühn J.H. ;

Teubner T. .

The European Physical Journal C - Particles and Fields, 1999, 9 (2) :221-228

[18] High-precision calculation of multiloop Feynman integrals by difference equations [J].

Laporta, S .

INTERNATIONAL JOURNAL OF MODERN PHYSICS A, 2000, 15 (32) :5087-5159

[19] The analytical value of the electron (g-2) at order alpha(3) in QED [J].

Laporta, S ;

Remiddi, E .

PHYSICS LETTERS B, 1996, 379 (1-4) :283-291

[20] THE RENORMALIZATION OF THE AXIAL ANOMALY IN DIMENSIONAL REGULARIZATION [J].

LARIN, SA .

PHYSICS LETTERS B, 1993, 303 (1-2) :113-118

← 1 2 3 →