期刊
PHYSICS LETTERS B
卷 612, 期 3-4, 页码 223-232出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2005.03.007
关键词
-
The complete electroweak O(alpha) corrections are calculated for the charged-current four-fermion production processes e(+)e(-) -> nu(tau)tau(+)mu(+)nu(mu), ud mu(-)nu(mu), and udsc The calculation is performed using complex gauge-boson masses, supplemented by complex couplings to restore gauge invariance. The evaluation of the occurring one-loop tensor integrals, which include 5- and 6-point functions, requires new techniques. Explicit numerical results are presented for total cross sections in the energy range from the W-pair-production threshold region up to a scattering energy of 2 TeV. A comparison with the predictions based on the double-pole approximation (DPA) provided by the generator RACOONWW reveals corrections beyond DPA of less than or similar to 0.5% in the energy range 170-300 GeV, in agreement with previous estimates for the intrinsic DPA uncertainty. The difference to the DPA increases to 1-2% for root s similar to 1-2 TeV. At threshold, where the DPA becomes unreliable, the full O(alpha) calculation corrects an improved Born approximation (IBA) by about 1.6%, also consistent with an error estimate of the IBA. (c) 2005 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据