Scattering of massless particles: scalars, gluons and gravitons

  title={Scattering of massless particles: scalars, gluons and gravitons},
  author={Freddy Cachazo and Song He and Ellis Ye Yuan},
  journal={Journal of High Energy Physics},
A bstractIn a recent note we presented a compact formula for the complete tree-level S-matrix of pure Yang-Mills and gravity theories in arbitrary spacetime dimension. In this paper we show that a natural formulation also exists for a massless colored cubic scalar theory. In Yang-Mills, the formula is an integral over the space of n marked points on a sphere and has as integrand two factors. The first factor is a combination of Parke-Taylor-like terms dressed with U(N ) color structures while… 

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