9 papers
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,…
Perturbative Quantization of Gravity Theories
Z. Bern
We discuss string theory relations between gravity and gauge theory tree amplitudes. Together with -dimensional unitarity, these relations can be used to perturbatively quantize…
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…
Perturbative Relationships Between QCD and Gravity and Some Implications
Z. Bern, L. Dixon, D. C. Dunbar +2
We discuss nontrivial examples illustrating that perturbative gravity is in some sense the `square' of gauge theory. This statement can be made precise at tree-level using the Kawa…
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…