Determination of the Strong Coupling Constant and Multijet Cross Section Ratio Measurements

2011/06/25 by M. Wobisch, Wobisch, M.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.48550/arxiv.1106.5132

4 pages, 2 figures, proceedings of DIS2011

arxiv created 2011/06/25 · openalex publication_date 2011/06/25 · arxiv updated 2011/06/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Concepts and results of determinations of the strong coupling constant in hadron collisions are discussed. A recent alpha_s result from the inclusive jet cross section in pp-bar collisions at sqrt(s)=1.96 TeV is presented which is based on perturbative QCD calculations beyond next-to-leading order. Emphasis is put on the consistency of the conceptual approach. Conceptual limitations in the approach of extracting alpha_s from cross section data are discussed and how these can be avoided by using observables that are defined as ratios of cross sections. For one such observable, the multijet cross section ratio R3/2, preliminary results are presented.

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