Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-10-10
Phys.Rev. D57 (1998) 5402-5409
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, REVTeX, 7 postscript figures
Scientific paper
10.1103/PhysRevD.57.5402
The renormalization group applied to perturbation theory is ordinarily used to define the running coupling constant in the spacelike region. However, to describe processes with timelike momenta transfers, it is important to have a self-consistent determination of the running coupling constant in the timelike region. The technique called analytic perturbation theory (APT) allows a consistent determination of this running coupling constant. The results are found to disagree significantly with those obtained in the standard perturbative approach. Comparison between the standard approach and APT is carried out to two loops, and threshold matching in APT is applied in the timelike region.
Milton Kimball A.
Solovtsova Olga P.
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