Measurement of Multijet Ratios and a Determination of αs at the Tevatron

Abstract

In this poster we present several recent results for the production of multijet final states in pp¯$poverline p $ collisions at a center of mass energy of 1.96 TeV, taken with the DØ experiment at the Fermilab Tevatron collider.. These measurements, defined as ratios of three-jet to two-jet quantities, reduce the dependence of the results on Parton Distribution Functions (PDFs) and experimental systematic uncertainties. Based on one of these ratio measurements, a value of αs is determined and the running of αs tested over a wide range of jet transverse momenta.