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from http://en.wikipedia.org/wiki/Chirality_(physics)"The helicity of a particle is right-handed if the direction of its spin is the same as the direction of its motion. It is left-handed if the directions of spin and motion are opposite.
As you can see this definition is depended on the motion of a particle which,of course,is not intrinsic so how can we call helicity,intrinsic?In fact what is the benefit of defining such a thing at all because every particle can move in any direction.
thanks
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