Zero dimensional point particles?

[ajv]

All elementary particles, which are not made up by any other particles (electrons, quarks), are said to be zero dimensional and have no size. But why not? Are electrons literally zero dimensional particles with no size?

 

[ajv]

All elementary particles, which are not made up by any other particles (electrons, quarks), are said to be zero dimensional and have no size. But why not? Are electrons literally zero dimensional particles with no size?

Can't point particles have size that is just too small to see?

 

[DaveC426913]

If they have size then they must have internal structure. Our current models say they don't.
If they are of non-zero diameter, then it takes a non-zero duration for a signal to pass from one side to the other, and that would mess up our current understanding physics.