115 Chapter 4: Fluctuations in Jet Tomography The important quantity in any of these calculations is P ( ϵ ), the probability that the final momentum is some fraction of the initial momentum, p f T = (1 − ϵ ) p i $_{T}$. For calculations that include only radiative processes, P ( ϵ ) = P$_{rad}$ ( ϵ ), where The possibility that no gluons are emitted (subsequent to the original gluon radiation created by the initial hard scatter) is encapsulated in the coefficient, P g $_{0}$, of the δ ( x ) term. P$_{rad}$ ( x ) =      P g $_{0}$δ ( x ) + ˜ P$_{rad}$ ( x ) e − N$_{g}$ ∑ n N n g n ! ˜ P$_{rad,n}$ ( x ) = e − $^{N$_{g}$}$δ ( x ) + e − $^{N$_{g}$}$N$_{g}$ ˜ P$_{rad,}$$_{1}$ ( x ) + . . . . (4.11) Due to the approximations used in the radiative calculations overabsorp- tion, P ( ϵ > 1), has a large support for highly suppressed jets. Usually, one of two prescriptions is applied to remove this unphysical artifact. Either the integrated excess probability weighs an explicit delta function, or reweighs (rw) the original distribution, P ( ϵ ) = P$_{old}$ ( ϵ ) θ (1 − ϵ ) + ∫ ∞ 1 dxP$_{old}$ ( x ) δ (1 − ϵ ) , (4.12) P$_{rw}$ ( ϵ ) = 1 ∫ ∞ 1 dxP$_{old}$ ( x ) P$_{old}$ ( ϵ ) θ (1 − ϵ ) . (4.13) Clearly the latter approach leads to larger R$_{AA}$ values for the two. For large overabsorption energy loss details are lost to the removal of the unphysical