Forskning ved Københavns Universitet - Københavns Universitet


CSW rules for a massive scalar

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • Rutger Herman Boels
  • Christian Schwinn
We derive the analog of the Cachazo-Svrcek-Witten (CSW) diagrammatic Feynman rules for four-dimensional Yang-Mills gauge theory coupled to a massive colored scalar. The mass term is shown to give rise to a new tower of vertices in addition to the CSW vertices for massless scalars in non-supersymmetric theories. The rules are derived directly from an action, once through a canonical transformation within light-cone Yang-Mills and once by the construction of a twistor action. The rules are tested against known results in several examples and are used to simplify the proof of on-shell recursion relations for amplitudes with massive scalars.
Udgivelsesdato: April 10
TidsskriftPhysics Letters B
Udgave nummer1
Sider (fra-til)80-86
StatusUdgivet - 2008

ID: 10478688