Strong Coupling Constant with Flavour Thresholds at Four Loops in the MS-bar Scheme

Preprint

20 June 1997

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ph/9706430

Abstract

We present in analytic form the matching conditions for the strong coupling constant alpha_s^(n_f)(mu) at the flavour thresholds to three loops in the modified minimal-subtraction scheme. Taking into account the recently calculated coefficient beta_3 of the Callan-Symanzik beta function of quantum chromodynamics, we thus derive a four-loop formula for alpha_s^(n_f)(mu) together with appropriate relationships between the asymptotic scale parameters Lambda^(n_f) for different numbers of flavours n_f.

Keywords

STRONG COUPLING CONSTANT
FLAVOUR THRESHOLDS
SCALE PARAMETERS
FOUR LOOPS
ALPHA_S
N_F

All Related Versions

Version 1, 1997-06-20, ArXiv
Published version: Physical Review Letters, 79 (12), 2184.

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