Speaker
Markos Maniatis
(Departamento de Ciencias Basicas, UBB, Chillan, Chile)
Description
n 2004 it has been shown that scattering amplitudes can be expressed by
glueing together simple three-point on-shell amplitudes. These so-called
BCFW-recursion relations can for instance be used to proof the explicit
form of the n-gluon scattering amplitude as conjectured by Parke and
Taylor. Moreover, the basic building blocks, the three-point on-shell
amplitudes, are, apart from a coupling constant, fixed by Poincaré
invariance. However, the BCFW-recursion relations are limited to tree
diagrams. We would like to show how, by a combination of the Feynman-tree
theorem with BCFW recursion relations, general scattering amplitudes can be
fixed from first principles, that is, Poincare invariance, unitarity and
gauge invariance.
