The helicity of a particle is positive (“right-handed”) if the direction of its spin is the same as the direction of its motion. It is negative (“left-handed”) if the directions of spin and motion are opposite. So a standard clock, with its spin vector defined by the rotation of its hands, has left-handed helicity if tossed with its face directed forwards.
No. — SophistiCat
So the difference between an electron and a positron is simply that one is left handed, the other right, in its “spin”. — apokrisis
This is not true. An electron may be spin up or down. — Kenosha Kid
I was steering towards a discussion of chirality. That should have been obvious. — apokrisis
And this view collapses charge and parity into a single formalism (or at least, that was what I have been meaning to check more carefully). — apokrisis
Just a random coincidence or are we dealing with the same force, only at different scales? — TheMadFool
Since the shell area increases as r^2, the energy density must decrease as r^2 — Kenosha Kid
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