Re: Positrons

ram@zedat.fu-berlin.de (Stefan Ram) wrote or quoted:

the vacuum state. I.e., "e⁺ + e⁻" is the compound system, the mass of
which differs from the sum of the two components taken in isolation.

  Oh, and, BTW, they seem to have a non-zero (negative) "binding"
  energy, but we can ignore this for simplification. But conceptually,
  it gets subtracted from their total mass in their COG.

  By "binding energy", I mean that, conceptually, moving them in
  from +oo and -oo, respectively, into the lab "releases" some
  energy because one fermion is "falling" within the electric
  field of the other fermion. (I did not think of positronium.)