OPERA neutrinos and superluminal helical motion
  We pinpoint how a subatomic particle with non-zero mass may attain, in principle, velocities faster-than-light by travelling in helical motion in the limit of very large momentum. This is an educated guess by virtue of the MINOS and OPERA experiments on eventual superluminal propagation of neutrinos. 
E. Canessa
physics.gen-ph