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Inverse Soft Factors and Grassmannian Residues · Around

2010

Inverse Soft Factors and Grassmannian Residues

Bullimore, Mathew

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The action of inverse soft factors on scattering amplitudes in N=4 SYM is shown to take a remarkably simple form in momentum twistor space.

This is used to identify individual residues of the grassmannian with primitive leading singularities at NMHV and N^2MHV and to derive explicit expressions in terms of momentum twistors.

Built on

I.M.Gelfand and R.W.MacPherson, Geometry in grassmannians and a generalisation of the dilogarithm
1982
Earlier work this paper cites.
F. Cachazo, Sharpening The Leading Singularity
Original
1988
Earlier work this paper cites.
E. Witten, Perturbative gauge theory as a string theory in twistor space
2004
Earlier work this paper cites.
R. Britto, F. Cachazo, B. Feng, and E. Witten, Direct Proof Of Tree-Level Recursion Relation In Yang- Mills Theory
2005
Earlier work this paper cites.
R. Britto, F. Cachazo, and B. Feng, New Recursion Relations for Tree Amplitudes of Gluons
2005
Earlier work this paper cites.
F. Cachazo, M. Spradlin, and A. Volovich, Leading Singularities of the Two-Loop Six-Particle MHV Amplitude
Original
2008
Earlier work this paper cites.

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