Update on the Measurement of αS with a 500 GeV Linear Collider

Abstract

An update on the prospects for the precise measurement of the strong coupling constant αS at a high energy Linear Collider via the three-jet rate is presented. In particular, the issue of the distribution of center-of-mass energies of the identified qq event sample, which can affect the determination of αS at the scale Q2=(500 GeV)2, is addressed.