Question

What is the meaning of helicity of a particle..??​

Answer 1

Answer:

The helicity of a particle is defined as the projection of a spin vector in the direction of its momentum vector.

Therefore, if a particle's spin vector points in the same direction as the momentum vector, the helicity is positive, and if they point in opposite directions, the helicity is negative.

Answer 2

Answer:

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Explanation:

The helicity of particles is defined as the projection of a spin vector in the direction of momentum vector. However the helicity of a maseless particle is always equal to chirality.

The helicity of a particle is a lorentz invariant.

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