  We derive a formula for computing the transition rate for a process involving
particles with momentum much higher than the temperature and chemical
potentials in a plasma by using an effective field theory approach. We apply it
to collision of charged particles with hard momentum inside a QED plasma. The
Debye screening effect and the damping of a charged particle moving in QED
plasma are studied. Using the Bloch-Nordsieck resummation, the infrared
divergences due to the absence of magnetic screening for QED plasma are shown
not to appear in physically measurable rates. The soft plasmon absorption and
emission for charged particles are discussed.
