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Name: Kyle
Status: student
Grade: 9-12
Location: Outside U.S.
Country: USA
Date: Summer 2011
Question:
Why does the shape of an electron have an effect on the similarity of a particle and its antiparticle?
Replies:
There are two issues here. The first is, "What is the shape (or the size) of a free electron?" Shape is a "classical physics" term, but the free electron is a "quantum mechanical" term. In that case "shape" has no physical meaning. The same applies to its anti-particle. If they get close enough they annihilate one another producing a photon. A photon does not have a "shape" either.

Vince Calder

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