Helicity meaning

hə-lĭs'ĭ-tē, hē'
The projection of a particle's spin vector in the direction of its momentum vector, being positive if it points in the same direction, and negative if it points in the opposite direction. Helicity is the chirality of the particle's spin.
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An instance of such projection.
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The projection of a particle's spin vector in the direction of its momentum vector, being positive if it points in the same direction, and negative if it points in the opposite direction. Helicity is in effect the handedness, or chirality , of the spin of a particle.
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