The effect of quark masses on the running of the QCD coupling constant

Carl Rosenzweig

doi:10.1007/BF01495040

The effect of quark masses on the running of the QCD coupling constant

Carl Rosenzweig

Department of Physics

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The presence of thresholds for finite quark masses alters the behavior of the QCD coupling constant. While the alterations are small they can have significant influence on the determination of the scale parameter Λ. Part of the discrepancy between recent high Q² determinations of Λ and older low Q² determinations can be attributed to charm and bottom thresholds. We present simple, analytic expressions for the mass dependence of α(Q²) and exploit these to discuss Λ determinations, scale breaking and the phenomenon of temporary freedom when more than 17 quark flavors exist.

Original language	English (US)
Pages (from-to)	179-186
Number of pages	8
Journal	Zeitschrift für Physik C Particles and Fields
Volume	14
Issue number	2
DOIs	https://doi.org/10.1007/BF01495040
State	Published - Jun 1982

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1007/BF01495040

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AB - The presence of thresholds for finite quark masses alters the behavior of the QCD coupling constant. While the alterations are small they can have significant influence on the determination of the scale parameter Λ. Part of the discrepancy between recent high Q2 determinations of Λ and older low Q2 determinations can be attributed to charm and bottom thresholds. We present simple, analytic expressions for the mass dependence of α(Q2) and exploit these to discuss Λ determinations, scale breaking and the phenomenon of temporary freedom when more than 17 quark flavors exist.

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The effect of quark masses on the running of the QCD coupling constant

Abstract

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