The role of universal and non universal Sudakov logarithms in four fermion processes at TeV energies: the one-loop approximation revisited

Details The role of universal and non universal Sudakov logarithms in four fermion processes at TeV energies: the one-loop approximation revisited The role of universal and non universal Sudakov logarithms in four fermion processes at TeV energies: the one-loop approximation revisited

2001-03-30

arxiv.org/abs/hep-ph/0103335v2

Phys.Rev. D64 (2001) 073008

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages and 13 figures; version to appear in Phys.Rev.D. e-mail: renard@lpm.univ-montp2.fr

Scientific paper

10.1103/PhysRevD.64.073008

We consider the separate effects on four fermion processes, in the TeV energy range, produced at one loop by Sudakov logarithms of universal and not universal kind, working in the 't Hooft xi=1 gauge. Summing the various vertex and box contributions allows to isolate two quite different terms.The first one is a combination of vertex and box quadratic and linear logarithms that are partially universal and partially not universal and independent of the scattering angle theta. The second one is theta-dependent, not universal, linearly logarithmic and only produced by weak boxes. We show that for several observables, measurable at future linear e+e- colliders (LC, CLIC), the role of the latter term is dominant and we discuss the implications of this fact for what concerns the reliability of a one-loop approximation.

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