====== TTP03-20 QED Form Factors at the two-loop level ======
 
 
<hidden TTP03-20  QED Form Factors at the two-loop level > We present the closed analytic expression of the form factors of the
 two-loop QED vertex amplitude for on-shell electrons of finite mass $m$
 and arbitrary momentum transfer $S=-Q^2$. The calculation is carried out
 within the continuous $D$-dimensional regularization scheme, with a single
 continuous parameter $D$, the dimension of the space-time, which
 regularizes at the same time UltraViolet (UV) and InfraRed (IR)
 divergences. The results are expressed in terms of 1-dimensional harmonic
 polylogarithms of maximum weight 4.
 </hidden>
|**R. Bonciani, P. Mastrolia and E. Remiddi**  | 
|**  Nucl.Phys.B  676 399-452 2004  **  |
| {{preprints:2003:ttp03-20.pdf|PDF}} {{preprints:2003:ttp03-20.ps|PostScript}}   |
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