Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-02-10
Phys.Rev. D64 (2001) 116009
Physics
High Energy Physics
High Energy Physics - Phenomenology
REVTeX 3.1, 12 pages with 3 EPS figures; enlarged version is published in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.64.116009
The new model for the QCD analytic running coupling, proposed recently, is extended to the timelike region. This running coupling naturally arises under unification of the analytic approach to QCD and the renormalization group (RG) formalism. A new method for determining the coefficients of the "analytized" RG equation is elaborated. It enables one to take into account the higher loop contributions to the new analytic running coupling (NARC) in a consistent way. The expression for the new analytic running coupling, independent of the normalization point, is obtained by invoking the asymptotic freedom condition. It is shown that the difference between the values of the NARC in respective spacelike and timelike regions is rather valuable for intermediate energies. This is essential for the correct extracting of the running coupling from experimental data. The new analytic running coupling is applied to the description of the inclusive $\tau$ lepton decay. The consistent estimation of the parameter $\Lambda_{QCD}$ is obtained here.
No associations
LandOfFree
New analytic running coupling in spacelike and timelike regions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with New analytic running coupling in spacelike and timelike regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New analytic running coupling in spacelike and timelike regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-370027