TTP06-05 The two-loop vector form factor in the Sudakov limit

TTP06-05 The two-loop vector form factor in the Sudakov limit

TTP06-05 The two-loop vector form factor in the Sudakov limit

Recently two-loop electroweak corrections to the neutral current

 four-fermion processes at high energies have been presented.
 The basic ingredient of this calculation is the evaluation of the
 two-loop corrections to the Abelian vector form factor in a
 spontaneously broken SU(2) gauge model.
 Whereas the final result and the derivation of the four-fermion
 cross sections from evolution equations have been published earlier,
 the calculation of the form factor from the two-loop Feynman
 diagrams is presented for the first time in this paper.
 We describe in detail the individual contributions to the form factor
 and their calculation with the help of the expansion by regions
 method and Mellin-Barnes representations.
Bernd Jantzen, Vladimir A. Smirnov
Eur.Phys.J. C47 671-695 2006
PDF PostScript arXiv
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