Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-05-27
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, uses moriond.sty (included). Contribution to "XXXVIIth Rencontres de Moriond, QCD and hadronic interactions", Les Arc
Scientific paper
Infrared and collinear events shapes are suited to directly probe properties of hard QCD. They are traditionally used to measure the strong coupling and to test the gauge structure of QCD. Perturbative predictions exist in several variations all of which depend on the renormalisation scheme leading to large theoretical uncertainties in the determination of $alpha_s$. To overcome this dominating error more and more schemes for setting the renormalisation scale are investigated. The application of RGI perturbation theory shows an incredible small spread of $\alpha_s$ indicating a reduced uncertainty and allows a measurement of the $\beta$-function directly from mean values.
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