Direct extraction of QCD Λ<SUB>MS</SUB> from e⁺e⁻ jet observables

Burby, S.J.; Maxwell, C.J.

Abstract

We directly fit the QCD dimensional transmutation parameter, , to experimental data on e+e− jet observables, making use of next-to-leading order (NLO) perturbative calculations. In this procedure there is no need to mention, let alone to arbitrarily vary, the unphysical renormalisation scale μ, and one avoids the ad hoc and potentially meaningless “theoretical error” associated with standard αs determinations. PETRA, SLD, and LEP data are considered in the analysis. An attempt is made to estimate the importance of uncalculated next-NLO and higher order perturbative corrections, and power corrections, by studying the scatter in the values of obtained for different observables.

Citation

Burby, S., & Maxwell, C. (2001). Direct extraction of QCD ΛMS from e⁺e⁻ jet observables. Nuclear Physics B, 609(1-2), 193-224. https://doi.org/10.1016/s0550-3213%2801%2900281-4

• Journal Article Type: Article
• Publication Date: Aug 20, 2001
• Deposit Date: Nov 29, 2006
• Journal: Nuclear Physics B
• Print ISSN: 0550-3213
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 609
• Issue: 1-2
• Pages: 193-224
• DOI: https://doi.org/10.1016/s0550-3213%2801%2900281-4
• Keywords: Electron-positron annihilation, Strong-coupling-constant, Free perturbation-theory, Su(N) gauge-theories, Quantum chromodynamics, E+E-annihilation, Cross-sections, Energy correlations, Leading order, Dependence.