Two-loop threshold singularities, unstable particles and complex masses

被引：33

作者：

Actis, Stefano ^{[1
]}

Passarino, Giampiero ^{[2
]}

Sturm, Christian ^{[3
]}

Uccirati, Sandro ^{[4
]}

机构：

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

[2] Univ Turin, Dipartimento Fis Teor, Italy INFN, Sez Torino, I-10124 Turin, Italy

[3] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[4] Univ Karlsruhe, Inst Theoret Teilchenphys, D-76128 Karlsruhe, Germany

来源：

PHYSICS LETTERS B | 2008年 / 669卷 / 01期

关键词：

Feynman diagrams; Multi-loop calculations; Higgs physics;

D O I：

10.1016/j.physletb.2008.09.028

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The effect of threshold singularities induced by unstable particles on two-loop observables is investigated and it is shown how to cure them working in the complex-mass scheme. The impact on radiative corrections around thresholds is thoroughly analyzed and shown to be relevant for two selected LHC and ILC applications: Higgs production via gluon fusion and decay into two photons at two loops in the Standard Model. Concerning Higgs production, it is essential to understand possible sources of large corrections in addition to the well-known QCD effects. It is shown that NLO electroweak corrections can incongruently reach a 10% level around the W W vector-boson threshold without a complete implementation of the complex-mass scheme in the two-loop calculation. (C) 2008 Elsevier BY. All rights reserved.

引用

页码：62 / 68

页数：7

共 37 条

[1] Two-loop tensor integrals in quantum field theory [J].

Actis, S ;

Passarino, G ;

Ferroglia, A ;

Passera, M ;

Uccirati, S .

NUCLEAR PHYSICS B, 2004, 703 (1-2) :3-126

[2]

ACTIS S, ARXIV08091301HEPPH

[3]

ACTIS S, ARXIV08093667HEPPH

[4]

ACTIS S, ARXIV08070102HEPPH

[5] Two-loop renormalization in the standard model. Part III: Renormalization equations and their solutions [J].

Actis, Stefano ;

Passarino, Giampiero .

NUCLEAR PHYSICS B, 2007, 777 (1-2) :100-156

[6] Two-loop renormalization in the Standard Model. Part II: Renormalization procedures and computational techniques [J].

Actis, Stefano ;

Passarino, Glampiero .

NUCLEAR PHYSICS B, 2007, 777 (1-2) :35-99

[7] Two-loop renormalization in the standard model. part I: Prolegomena [J].

Actis, Stefano ;

Ferroglia, Andrea ;

Passera, Massimo ;

Passarino, Giampiero .

NUCLEAR PHYSICS B, 2007, 777 (1-2) :1-34

[8]

ADAM NE, ARXIV08031154HEPPH

[9] Review of particle physics [J].

Amsler, C. ;

Doser, M. ;

Antonelli, M. ;

Asner, D. M. ;

Babu, K. S. ;

Baer, H. ;

Band, H. R. ;

Barnett, R. M. ;

Bergren, E. ;

Beringer, J. ;

Bernardi, G. ;

Bertl, W. ;

Bichsel, H. ;

Biebel, O. ;

Bloch, P. ;

Blucher, E. ;

Blusk, S. ;

Cahn, R. N. ;

Carena, M. ;

Caso, C. ;

Cecccci, A. ;

Chakraborty, D. ;

Chen, M. -C. ;

Chivukula, R. S. ;

Cowan, G. ;

Dahl, O. ;

D'Ambrosio, G. ;

Damour, T. ;

de Gouvea, A. ;

DeGrand, T. ;

Dobrescu, B. ;

Drees, M. ;

Edwards, D. A. ;

Eidelman, S. ;

Elvira, V. D. ;

Erler, J. ;

Ezhela, V. V. ;

Feng, J. L. ;

Fetscher, W. ;

Fields, B. D. ;

Foster, B. ;

Gaisser, T. K. ;

Garren, L. ;

Gerber, H. -J. ;

Gerbier, G. ;

Gherghetta, T. ;

Giudice, G. F. ;

Goodman, M. ;

Grab, C. ;

Gritsan, A. V. .

PHYSICS LETTERS B, 2008, 667 (1-5) :1-+

[10] STABLE CALCULATIONS FOR UNSTABLE PARTICLES - RESTORING GAUGE-INVARIANCE [J].

ARGYRES, EN ;

BEENAKKER, W ;

JANVANOLDENBORGH, G ;

DENNER, A ;

DITTMAIER, S ;

HOOGLAND, J ;

KLEISS, R ;

PAPADOPOULOS, CG ;

PASSARINO, G .

PHYSICS LETTERS B, 1995, 358 (3-4) :339-346

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