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helicity



  1. (GENERAL PHYSICS) The measure of "twist" an object has; for example, the degree of coiling of a magnetic field.

  2. (PARTICLE PHYSICS) The projection of a particle's spin along its direction of motion. The helicity of a particle is described as being either left- or right-handed depending on whether its spin vector is in the direction of motion or against it.

       • PARTICLE PHYSICS