1205.3714 (Jochen Schieck et al.)

Measurement of the strong coupling alpha_S from the three-jet rate in
e+e- - annihilation using JADE data    [PDF]

Jochen Schieck, Siegfried Bethke, Stefan Kluth, Christoph Pahl, Zoltan Trocsanyi

We present a measurement of the strong coupling alpha_S using the three-jet rate measured with the Durham algorithm in e+e- -annihilation using data of the JADE experiment at centre-of-mass energies between 14 and 44 GeV. Recent theoretical improvements provide predictions of the three-jet rate in e+e- -annihilation at next-to-next-to-leading order. In this paper a measurement of the three-jet rate is used to determine the strong coupling alpha_s from a comparison to next-to-next-to-leading order predictions matched with next-to-leading logarithmic approximations and yields a value for the strong coupling alpha_S(MZ) = 0.1199+- 0.0010 (stat.) +- 0.0021 (exp.) +- 0.0054 (had.) +- 0.0007 (theo.) consistent with the world average.

View original: http://arxiv.org/abs/1205.3714