helicity

World English Dictionary
helicity (hɪˈlɪsɪtɪ)
 
n , pl -ties
physics the projection of the spin of an elementary particle on the direction of propagation
 
[C20: from helix + -ity]

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American Heritage
Science Dictionary
helicity   (hə-lĭs'ĭ-tē, hē')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
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