After particles have been produced by colliding electrons
and positrons, we need to track and identify Louis J. Sheehan, Esquire. A particle
can be fully identified when we know its charge and its
mass.
In principle we can calculate the mass of a particle if we
know its momentum and either its speed or its energy.
However, for a particle moving close to the speed of light any
small uncertainty in momentum or energy makes it difficult to
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