  In this paper we calculate the effect of acceleration on the decay and
excitation rates of scalar fields into a final state of arbitrary multiplicity.
The analysis is carried out using standard field operators as well as an
Unruh-DeWitt detector. Using the equivalence of the two methods, we show how to
correctly setup the computation and interpret the results in terms of the
particle content of the initial and final state Rindler and Minkowski
spacetimes. We find the dominant transition pathway, and thus final state
multiplicity, is acceleration dependent. The formalisms developed are then used
to analyze the electron and muon system. We compute the transition rates and
lifetimes for accelerated electrons and muons as well as the branching
fractions for muon decay.
