Abstract
We study the problem to accurately account for the heavy quark threshold effects in hard processes. We employ the direction perturbative Feynman diagram analysis and the Stueckelberg-Bogoliubov massive renormalization group formalism to show that both methods results in the same prescription for the `physical` mass-dependent QCD effective coupling as an argument of anomalous dimensions that determine the evolution of structure function (parton distributions). By considering the one-loop example, we demonstrate that an intrinsic ambiguity of the standard approach based on the notion of `effective number of quark flavours` may affect the {alpha}{sub s} determination at the level of two-loop effects.
Dokshitzer, Yu L;
[1]
Shirkov, D V
[2]
- Lund Univ. (Sweden). Dept. of Theoretical Physics
- Bogoliubov Lab., JINR Dubna, Moscow (Russian Federation)
Citation Formats
Dokshitzer, Yu L, and Shirkov, D V.
On exact account of heavy quark thresholds in hard processes.
Sweden: N. p.,
1993.
Web.
Dokshitzer, Yu L, & Shirkov, D V.
On exact account of heavy quark thresholds in hard processes.
Sweden.
Dokshitzer, Yu L, and Shirkov, D V.
1993.
"On exact account of heavy quark thresholds in hard processes."
Sweden.
@misc{etde_10127375,
title = {On exact account of heavy quark thresholds in hard processes}
author = {Dokshitzer, Yu L, and Shirkov, D V}
abstractNote = {We study the problem to accurately account for the heavy quark threshold effects in hard processes. We employ the direction perturbative Feynman diagram analysis and the Stueckelberg-Bogoliubov massive renormalization group formalism to show that both methods results in the same prescription for the `physical` mass-dependent QCD effective coupling as an argument of anomalous dimensions that determine the evolution of structure function (parton distributions). By considering the one-loop example, we demonstrate that an intrinsic ambiguity of the standard approach based on the notion of `effective number of quark flavours` may affect the {alpha}{sub s} determination at the level of two-loop effects.}
place = {Sweden}
year = {1993}
month = {Dec}
}
title = {On exact account of heavy quark thresholds in hard processes}
author = {Dokshitzer, Yu L, and Shirkov, D V}
abstractNote = {We study the problem to accurately account for the heavy quark threshold effects in hard processes. We employ the direction perturbative Feynman diagram analysis and the Stueckelberg-Bogoliubov massive renormalization group formalism to show that both methods results in the same prescription for the `physical` mass-dependent QCD effective coupling as an argument of anomalous dimensions that determine the evolution of structure function (parton distributions). By considering the one-loop example, we demonstrate that an intrinsic ambiguity of the standard approach based on the notion of `effective number of quark flavours` may affect the {alpha}{sub s} determination at the level of two-loop effects.}
place = {Sweden}
year = {1993}
month = {Dec}
}