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Analytic perturbation theory: A new approach to the analytic continuation of the strong coupling constant αS into the timelike region

Kimball A. Milton*

Olga P. Solovtsova†

  • Department of Physics and Astronomy, The University of Oklahoma, Norman, Oklahoma 73019

  • Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russia

  • *E-mail address: milton@mail.nhn.ou.edu
  • †E-mail address: olsol@thsun1.jinr.dubna.su
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Phys. Rev. D 57, 5402 – Published 1 May, 1998

DOI: https://doi.org/10.1103/PhysRevD.57.5402

Abstract

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.

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Phys. Rev. D 57, 5402– Published 1 May, 1998
  • Received 14 October 1997

© 1998 American Physical Society

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