Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-02-06
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex2e with sprocl.sty, 19 pages with 5 encapsulated figures, presented at International Symposium on QCD Corrections and New
Scientific paper
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. When a number of calculational tools are combined together --- helicity, color and supersymmetry decompositions, plus unitarity and factorization properties --- it becomes possible to compute multi-parton one-loop QCD amplitudes without ever evaluating analytically standard one-loop Feynman diagrams. One-loop helicity amplitudes are now available for processes with five external partons (ggggg, q\bar{q}ggg and q\bar{q}q'\bar{q}'g), and for an intermediate vector boson V \equiv \gamma^*,Z,W plus four external partons (Vq\bar{q}gg and Vq\bar{q}q'\bar{q}'). Using these amplitudes, numerical programs have been constructed for the next-to-leading order corrections to the processes p\bar{p} to 3 jets (ignoring quark contributions so far) and e^+e^- to 4 jets.
Bern Zvi
Dixon Lance
Kosower David A.
Signer Adrian
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