Vertex diagrams for the QED form factors at the 2-loop level
Vertex diagrams for the QED form factors at the 2-loop level
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DOI:
10.1016/j.nuclphysb.2004.08.009
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发表时间:
2003-01
期刊:
影响因子:
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通讯作者:
R. Bonciani;P. Mastrolia;U. E.RemiddiFreiburg;U. Bologna;U. Karlsruhe;Infn
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文献类型:
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作者:
R. Bonciani;P. Mastrolia;U. E.RemiddiFreiburg;U. Bologna;U. Karlsruhe;Infn
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=−Q2and finite squared electron mass me2=a. We identify all the master integrals (MIs) of the problem and write the differential equations in Q2which they satisfy. The equations are expanded in powers of ϵ=(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 ϵ of the MIs up to zeroth order expressed in close analytic form in terms of harmonic polylogarithms.