Comment on the Identities of the Gluon Tree Amplitudes

Details Comment on the Identities of the Gluon Tree Amplitudes Comment on the Identities of the Gluon Tree Amplitudes

2010-07-04

arxiv.org/abs/1007.0597v1

Physics

High Energy Physics

High Energy Physics - Theory

4 pages

Scientific paper

Recently, Bjerrum-Bohr, Damgaard, Feng and Sondergaard derived a set of new interesting quadratic identities of the Yang-Mills tree scattering amplitudes. Here we comment that these quadratic identities of YM amplitudes actually follow directly from the KLT relation for graviton-dilaton-axion scattering amplitudes (in 4 dimensional spacetime). This clarifies their physical origin and also provides a simpler version of the new identities. We also comment that the recently discovered Bern-Carrasco-Johansson identities of YM helicity amplitudes can be verified by using (repeatedly) the Schouten identity. We also point out additional quadratic identities that can be written down from the KLT relations.

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