= Scattering t-channel
{title2=$t=(p_1-p_3)^2$}
= t-channel
{c}
{synonym}
With a specified ordering of external legs, this crossed channel carries the difference between an incoming and an outgoing energy-momentum vector. A one-particle exchange <pole> requires that difference to be on the exchanged particle's <mass shell>. Ordered amplitudes in one spatial dimension can label the crossed invariant using the difference of the two rapidity-parameterized external momenta; the external-leg convention fixes which crossed invariant is named $t$.
Back to article page
