First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations

Details First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations

2007-12-03

arxiv.org/abs/0712.0327v2

JHEP 0802:040,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, LaTeX, extended discussion of hadronization corrections, typos corrected

Scientific paper

10.1088/1126-6708/2008/02/040

We present the first determination of the strong coupling constant from a fit of next-to-next-to-leading order QCD predictions to event-shape variables, measured in $e^+e^-$ annihilations at LEP. The data have been collected by the ALEPH detector at centre-of-mass energies between 91 and 206 GeV. Compared to results of next-to-leading order fits we observe that the central fit values are lower by about 10%, with considerably reduced scatter among the results obtained with different event-shape variables. The dominant systematic uncertainty from renormalization scale variations is reduced by a factor of two. By combining the results for several event-shape variables and centre-of-mass energies, we find \alpha_s(M_Z^2) = 0.1240+-0.0008(stat)+-0.0010(exp)+-0.0011(had)+-0.0029(theo).

Affiliated with

Also associated with

No associations

Rating

First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-51284