Optimizing the reduction of one-loop amplitudes

被引:55
|
作者
Mastrolia, P. [1 ]
Ossola, G. [2 ]
Papadopoulos, C. G. [2 ]
Pittau, R. [3 ]
机构
[1] CERN, Div Theory, CH-1211 Geneva 23, Switzerland
[2] NCSR Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece
[3] Univ Granada, CAPFE, Dept Fis Teor & Cosmos, E-18071 Granada, Spain
来源
关键词
NLO computations; standard model;
D O I
10.1088/1126-6708/2008/06/030
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 present an optimization of the reduction algorithm of one-loop amplitudes in terms of master integrals. It is based on the exploitation of the polynomial structure of the integrand when evaluated at values of the loop-momentum fulfilling multiple cut-conditions, as emerged in the OPP-method. The reconstruction of the polynomials, needed for the complete reduction, is rendered very versatile by using a projection-technique based on the Discrete Fourier Transform. The novel implementation is applied in the context of the NLO QCD corrections to u (d) over bar -> W+W-W+.
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页数:20
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