On the Apparent Superluminal Motion of a Damped Gaussian Pulse
  Alicki has demonstrated that a travelling Gaussian pulse subject to damping is indistinguishable from an undamped pulse moving with greater speed; such an effect could create the illusion of a pulse moving faster than light. In this note, an alternative derivation of the same result is presented. However, it is unlikely that this particular illusion could explain the superluminal neutrino-velocities reported by OPERA. 
N. Redington
physics.gen-ph physics.pop-ph