content_image/311117.jpg content_image/311118.jpg content_image/311123.jpg content_image/311124.jpg content_image/311125.jpg
For large- x Bethe-Heitler radiation one sees from Eq. (D.6) that 

Eq. (D.10) then gives 

## D.2 AdS/CFT Brick Estimate 

<img src='content_image/311117.jpg'>

<img src='content_image/311118.jpg'>

We wish to more rigorously derive Eq. (5.5). Recall that Eq. (5.5) justifies Eq. (5.6), the back-of-the-envelope explanation for the momentum independences and normalization for R $^{cb}$( p$_{T}$ ) = R c $_{AA}$( p$_{T}$ ) /R b $_{AA}$( p$_{T}$ ) for AdS/CFT Drag-type heavy quark energy loss. 

From the simple trailing string model of [342, 343] we have by Eq. (5.1) 

where 

<img src='content_image/311123.jpg'>

<img src='content_image/311124.jpg'>

with T the temperature of the SYM plasma and M the heavy quark mass. Solving Eq. (D.15) one finds that 

<img src='content_image/311125.jpg'>

