content_image/325783.jpg content_image/325784.jpg content_image/325785.jpg content_image/325786.jpg
## Massless Field and Charge with Recoil 

With 

the E&M result is 

<img src='content_image/325783.jpg'>

<img src='content_image/325784.jpg'>

<img src='content_image/325785.jpg'>

<img src='content_image/325786.jpg'>

where we now find that the limiting form of the massive result is now recov- ered. 

