(CRC-TR 211 Transport Meeting)

\begin{equation*} p^{\mu} \frac{\partial f}{\partial x^{\mu}} + m \frac{\partial(K^{\mu} f)}{\partial p^{\mu}} = \frac{1}{2} \frac{g}{(2 \pi \hbar)^3} \int_{\R^3} \frac{\dd^3 \vec{p}_2}{E_2} \int_{\R^3} \frac{\dd^3 \pvec{p}_1}{E_1'} \int_{\R^3} \frac{\dd^3 \pvec{p}_2}{E_2'} W(p_1',p_2' \leftarrow p_1,p_2) \left (f_1' f_2' \, \overline{f} \, \overline{f}_2 - f f_1 \overline{f}_1' \overline{f}_2' \right ) \end{equation*}