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Quantum ChromodynamicsHigh Energy Experiments and Theory$
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Günther Dissertori, Ian G. Knowles, and Michael Schmelling

Print publication date: 2009

Print ISBN-13: 9780199566419

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780199566419.001.0001

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The Strong Coupling Constant

The Strong Coupling Constant

(p.305) 8 The Strong Coupling Constant
Quantum Chromodynamics




Oxford University Press

This chapter reviews the determination of the strong coupling. Apart from the quark masses, the strong coupling is the only free parameter of QCD. Frequently employed methods to infer the strength of the strong coupling are presented, as well as a global average of the individual results. Experimental inputs cover inclusive measurements, decay rates, lattice calculations, scaling violations, and event shape measurements. The results cover reactions with time-like and space-like momentum transfers and lepton-lepton, lepton-hadron, and hadron-hadron collisions. All results are consistent with a single value, which evolves with energy according to the QCD expectation.

Keywords:   strong coupling, inclusive measurements, decay rates, lattice calculations, scaling violations, event-shape variables, global average

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