Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland.
PRISMA Cluster of Excellence, Institute of Physics, Johannes Gutenberg University, D-55099 Mainz, Germany.
Phys Rev Lett. 2014 Nov 21;113(21):212001. doi: 10.1103/PhysRevLett.113.212001. Epub 2014 Nov 18.
Charged gauge boson pair production at the Large Hadron Collider allows detailed probes of the fundamental structure of electroweak interactions. We present precise theoretical predictions for on-shell W+ W- production that include, for the first time, QCD effects up to next to next to leading order in perturbation theory. As compared to next to leading order, the inclusive W+ W- cross section is enhanced by 9% at 7 TeV and 12% at 14 TeV. The residual perturbative uncertainty is at the 3% level. The severe contamination of the W+ W- cross section due to top-quark resonances is discussed in detail. Comparing different definitions of top-free W+ W- production in the four and five flavor number schemes, we demonstrate that top-quark resonances can be separated from the inclusive W+ W- cross section without a significant loss of theoretical precision.
在大型强子对撞机上产生带电规范玻色子对，可以对电弱相互作用的基本结构进行详细的探测。我们提出了精确的理论预测，包括在微扰理论中首次达到次领头阶的 QCD 效应。与次领头阶相比，在 7 TeV 和 14 TeV 时，包含 QED 效应的 W+W-截面分别增强了 9%和 12%。剩余的微扰不确定性在 3%的水平。详细讨论了由于顶夸克共振而导致 W+W-截面严重污染的问题。通过比较四和五夸克数方案中不同的无顶 W+W-产生定义，我们证明可以在不显著损失理论精度的情况下，将顶夸克共振与包含顶夸克共振的 W+W-截面分离。
