====== TTP03-21 Vertex diagrams for the QED form factors at the 2-loop level ======
 
 
   <hidden TTP03-21  Vertex diagrams for the QED form factors at the 2-loop level > We carry out a systematic investigation of all the 2-loop integrals 
 occurring in the electron vertex in QED in the continuous $D$-dimensional 
 regularization scheme, for on-shell electrons, momentum transfer $t=-Q^2$ 
 and finite squared electron mass $m_e^2=a$. We identify all the 
 Master Integrals (MI's) of the problem and write the differential equations 
 in $Q^2$ which they satisfy. The equations are expanded in powers of 
 $\epsilon = (4-D)/2$ and solved by the Euler's method of the variation 
 of the constants. As a result, we obtain the coefficients of the 
 Laurent expansion in $\epsilon$ of the MI's up to zeroth order 
 expressed in close analytic form in terms of Harmonic Polylogarithms 
 </hidden>
|**R. Bonciani, P. Mastrolia and E. Remiddi**  | 
|**  Nucl.Phys.B  661 289-343 2003  **  |
| {{preprints:2003:ttp03-21.pdf|PDF}} {{preprints:2003:ttp03-21.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0301170|arXiv]]   |
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