1212.3923 (Francis Brown et al.)

Decomposing Feynman rules    [PDF]

Francis Brown, Dirk Kreimer

We exhibit in the simple example of the Dunce's cap Feynman graph the structure of parametric renormalization on the level of integrands, and exhibit also the decomposition $\Phi^R=\Phi_{\mathrm{fin}}^{-1}(\Theta_0)\star \Phi^R_{\mathrm{\makebox{1-s}}}(S/S_0)\star\Phi_{\mathrm{fin}}(\Theta)$ into angles and scales of renormalized Feynman rules.

View original: http://arxiv.org/abs/1212.3923