  I calculate the dispersion relation for quarks of mass $m$ and momentum $k$
in a quark gluon plasma at temperature $T$, in the limit $m^2+k^2 \gg (gT)^2$,
where $g$ is the strong coupling constant. I find three contributions to the
dispersion relation: one that depends on $T$ but not $m$ or $k$, one that
depends on $m$ and $T$ but not $k$, and third contribution that depends on all
three (and is opposite in sign to the other two).
