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Where does energy come from in QFT?

Problem Statement
The origin of energy in the creation of elementary particles
Relevant Equations
QFT
When we say energy is applied to that field to create an excitation which is a particle, where does that energy come from and how is it applied? For example on beta decay where a new electron is formed, where does the energy come from the create an excitement in the electron field?
 
From the W boson that it's annihilated.
 

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