  In recent experiments conducted by the OPERA collaboration, researchers
claimed the observation of neutrinos propagating faster than the light speed in
vacuum. If correct, their results raise several issues concerning the special
theory of relativity and the standard model of fundamental particles. Here, the
physical consequences of superluminal neutrinos described by a tachyonic Dirac
lagrangian, are explored within the standard model of electroweak interactions.
If neutrino tachyonic behavior is allowed, it could provide a simple
explanation for the parity violation in weak interactions and why electroweak
theory has a chiral aspect, leading to invariance under a $SU_{L}(2)\times
U_{Y}(1)$ gauge group. Right-handed neutrino becomes sterile and decoupled from
the other particles quite naturally.
