content_image/301985.jpg content_image/301984.jpg content_image/301983.jpg
What we will do is to solve a problem more relevant to finding the zeroth order contribution than bremsstrahlung radiation: beta decay radiation (pair production). 

## F.4 Pair Production 

## F.4.1 Classical 

We now take as our current a (charge) pair production 

<img src='content_image/301985.jpg'>

where we have 

<img src='content_image/301984.jpg'>

we have allowed ourselves the freedom to have both difference masses and different momenta for the two (opposite) charges. 

The Fourier transform of our current is 

<img src='content_image/301983.jpg'>

The only difference classically from the bremsstrahlung result is that the 

