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Strong coupling constant from scaling violations in fragmentation functions.

B A Kniehl¹, G Kramer, B Pötter

¹II. Institut fur Theoretische Physik, Universitat Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.

Physical Review Letters

|January 3, 2001

Summary

Researchers determined the strong coupling constant, alpha(s), using scaling violations in particle fragmentation. This study provides a new world average for this fundamental parameter in particle physics.

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Area of Science:

High Energy Physics
Quantum Chromodynamics
Particle Physics

Background:

The strong coupling constant, alpha(s), is a fundamental parameter in quantum chromodynamics (QCD).
Accurate determination of alpha(s) is crucial for theoretical predictions in particle physics.
Scaling violations in fragmentation functions provide a sensitive probe for alpha(s).

Purpose of the Study:

To present a new determination of the strong coupling constant, alpha(s).
To analyze scaling violations in fragmentation functions of charged pions, kaons, and protons.
To provide an updated world average for alpha(s).

Main Methods:

Analysis of scaling violations in fragmentation functions.
Inclusion of e+e- annihilation data from CERN LEP1 and SLAC SLC at the Z-boson resonance.

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Incorporation of precise data from SLAC PEP at sqrt(s) = 29 GeV.

Main Results:

A new determination of alpha(s)(5)(M(Z)) = 0.1170 +/- 0.0073 at next-to-leading order.
The study provides an updated value for the strong coupling constant.
The results are consistent with previous measurements but offer improved precision.

Conclusions:

The strong coupling constant has been precisely determined using fragmentation function scaling violations.
This new determination contributes to a more accurate world average for alpha(s).
The findings reinforce the validity of perturbative QCD calculations.