Measurement of (sub S from Hadronic Event Observables at the Zsup 0 Resonance
Author:
Publisher:
Published: 1994
Total Pages:
ISBN-13:
DOWNLOAD EBOOKPosts
Measurement of [alpha][sub S] from Hadronic Event Observables at the Z[sup 0] Resonance
Author:
Publisher:
Published: 2005
Total Pages:
ISBN-13:
DOWNLOAD EBOOKThe authors have measured the strong coupling [alpha][sub s] using hadronic decays of Z[sup 0] bosons collected by the SLD experiment at SLAC. The data were compared with QCD predictions both at fixed order, O([alpha][sub s][sup 2]), and including resummed analytic formulae based on the leading and next-to-leading logarithm approximation. The study includes event shapes, jet rates, and particle correlations. They checked the consistency between [alpha][sub s] extracted from these different measures and found the dominant uncertainty on [alpha][sub s] to be from uncalculated higher order contributions.
Measurement of [alpha]{sub S} from Hadronic Event Observables at the Z° Resonance
Author:
Publisher:
Published: 1994
Total Pages: 6
ISBN-13:
DOWNLOAD EBOOKThe authors have measured the strong coupling [alpha]{sub s} using hadronic decays of Z° bosons collected by the SLD experiment at SLAC. The data were compared with QCD predictions both at fixed order, O([alpha]{sub s}2), and including resummed analytic formulae based on the leading and next-to-leading logarithm approximation. The study includes event shapes, jet rates, and particle correlations. They checked the consistency between [alpha]{sub s} extracted from these different measures and found the dominant uncertainty on [alpha]{sub s} to be from uncalculated higher order contributions.
Determination Of[alpha][sub S](M[sub Z][sup 2] from Hadronic Event Shape Observables in E[sup+]e[sup[minus] Annihilation
Author:
Publisher:
Published: 2001
Total Pages:
ISBN-13:
DOWNLOAD EBOOKOne of the most important tasks in high energy physics is the precise determination of the strong coupling[alpha][sub s](M[sub Z][sup 2]). Not only does measurement of[alpha][sub s](M[sub Z][sup 2]) in different hard processes and at different hard scales Q provide a fundamental test of the theory of strong interactions, Quantum Chromodynamics (QCD), but it also allows constraints on extensions to the Standard Model of elementary particles. Here, the determination of[alpha][sub s](M[sub Z][sup 2]) using O([alpha][sub s][sup 2]) calculations of hadronic event shape observables in e[sup+]e[sup[minus]] annihilation is reviewed. The large scatter among[alpha][sub s](M[sub Z][sup 2]) values determined from different observables may be interpreted as arising from the effect of uncalculated higher-order contributions. The application of optimized perturbation theory and Pade approximants in an attempt to reduce this effect is discussed.
