Techniques for one-loop tensor integrals in many-particle processes
Techniques for one-loop tensor integrals in many-particle processes
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DOI：
10.1016/j.nuclphysbps.2006.03.008
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发表时间：
2006-01
期刊：
影响因子：
--
通讯作者：
A. Denner;S. Dittmaier
中科院分区：
文献类型：
--
作者：
A. Denner;S. Dittmaier
我们简要地概述了用于计算$\PEP\PEM\TO4$费米子的完全电弱单圈修正的张量单圈积分的数值稳定性的方法。特别地，对于小Gram(和其他运动学)行列式的精细极限中的一些四点积分，说明了新方法对传统Passarino-Veltman约化方法的改进。
We briefly sketch the methods for a numerically stable evaluation of tensor one-loop integrals that have been used in the calculation of the complete electroweak one-loop corrections to $\Pep\Pem\to4 $fermions. In particular, the improvement of the new methods over the conventional Passarino--Veltman reduction is illustrated for some 4-point integrals in the delicate limits of small Gram (and other kinematical) determinants.