6 papers · 1 filter
Two-loop helicity amplitudes for fermion-fermion scattering
A. De Freitas, Z. Bern
We discuss the calculation of two-loop helicity amplitudes for quark-quark scattering in QCD and four-gluino scattering in N=1 supersymmetric Yang-Mills theory. We study the depend…
Di-photon production at the LHC
Zvi Bern, Lance Dixon, Carl Schmidt
The standard model production of two photons is one of the most important backgrounds to light Higgs boson production at the LHC. In this talk we discuss the di-photon background,…
The Infrared Behavior of QCD Cross Sections at Next-to-Next-to-Leading Order
Zvi Bern, Vittorio Del Duca, William B. Kilgore +1
In this talk we examine how one-loop soft and collinear splitting functions occur in the calculation of next-to-next-to-leading order (NNLO) corrections to production rates, and we…
Multi-Parton Loop Amplitudes and Next-to-Leading Order Jet Cross-Sections
Z. Bern, L. Dixon, D. A. Kosower +1
We review recent developments in the calculation of QCD loop amplitudes with several external legs, and their application to next-to-leading order jet production cross-sections. Wh…
String-Based Perturbative Methods for Gauge Theories
Zvi Bern
Recent progress in the computation of one-loop gluon amplitudes is reviewed. These methods were originally derived from superstring theory and are significantly more efficient than…
The Five Gluon Amplitude and One-Loop Integrals
Z. Bern, L. Dixon, D. A. Kosower
We review the conventional field theory description of the string motivated technique. This technique is applied to the one-loop five-gluon amplitude. To evaluate the amplitude a g…