Tuesday, August 6, 2013

1308.1055 (William B. Kilgore)

The Two-Loop Infrared Structure of Amplitudes with Mixed Gauge Groups    [PDF]

William B. Kilgore
The infrared structure of (multi-loop) scattering amplitudes is determined entirely by the identities of the external particles participating in the scattering. The two-loop infrared structure of pure \qcd\ amplitudes has been known for some time. By computing the two-loop amplitudes for $\bar{f}\,f\longrightarrow X$ and $\bar{f}\,f\longrightarrow V_1\,V_2$ scattering in an $SU(N)\times SU(M)\times U(1)$ gauge theory, I determine the anomalous dimensions which govern the infrared structure for any massless two-loop amplitude.
View original: http://arxiv.org/abs/1308.1055

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