Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-07-08
Nucl.Phys.Proc.Suppl.135:147-151,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
Contribution to the Proceedings of "Loops and Legs in Quantum Field Theory 2004", Zinnowitz, Usedom Island, Germany, April 200
Scientific paper
10.1016/j.nuclphysbps.2004.09.05
Splitting amplitudes govern the behavior of scattering amplitudes at the momenta of external legs become collinear. In this talk we outline the calculation of two-loop splitting amplitudes via the unitarity sewing method. This method retains the simple factorization properties of light-cone gauge, but avoids the need for prescriptions such as the principal value or Mandelstam-Leibbrandt ones. The encountered loop momentum integrals are then evaluated using integration-by-parts and Lorentz invariance identities. We outline a variety of applications for these splitting amplitudes.
Bern Zvi
Dixon Lance J.
Kosower David A.
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