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SUMMARY:Harmonic R-matrices for Scattering Amplitudes and Spectral Regular
 ization - Jan Plefka (Humboldt)
DTSTART:20130307T130000Z
DTEND:20130307T140000Z
UID:TALK43368@talks.cam.ac.uk
CONTACT:Dr Dorigoni
DESCRIPTION:Planar N=4 super Yang-Mills appears to be integrable. While th
 is allows to find this theory's exact spectrum\, integrability has hithert
 o been of no direct use for scattering amplitudes. To remedy this\, we def
 orm all scattering amplitudes by a spectral parameter. The deformed tree-l
 evel four-point function turns out to be essentially the one-loop R-matrix
  of the integrable N=4 spin chain satisfying the Yang-Baxter equation. Def
 ormed on-shell three-point functions yield novel three-leg R-matrices sati
 sfying bootstrap equations. Finally\, we supply initial evidence that the 
 spectral parameter might find its use as a novel symmetry-respecting regul
 ator replacing dimensional regularization. Its physical meaning is a local
  deformation of particle helicity\, a fact which might be useful for a muc
 h larger class of non-integrable four-dimensional field theories. 
LOCATION:Potter Room (first floor\, Pav. B)
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