A study of event shapes and determinations of alpha(s) using data of e+ e- annihilations at s**(1/2) = 22-GeV to 44-GeV

Collaboration, JADE and Finch, Alexander (1998) A study of event shapes and determinations of alpha(s) using data of e+ e- annihilations at s**(1/2) = 22-GeV to 44-GeV. The European Physical Journal C (EPJ C) - Particles and Fields, 1 (3). pp. 461-478. ISSN 1434-6052

Full text not available from this repository.

Abstract

Data recorded by the JADE experiment at the PETRA e+e− collider were used to measure the event shape observables thrust, heavy jet mass, wide and total jet broadening and the differential 2-jet rate in the Durham scheme. For the latter three observables, no experimental results have previously been presented at these energies. The distributions were compared with resummed QCD calulations ( O(α2s) +NLLA), and the strong coupling constant αs(Q) was determined at different energy scales Q=s√ . The results, αs(22GeV)=0.161+0.016−0.011, αs(35GeV)=0.143+0.011−0.007, αs(44GeV)=0.137+0.010−0.007, are in agreement with previous combined results of PETRA albeit with smaller uncertainties. Together with corresponding data from LEP, the energy dependence of αs is significantly tested and is found to be in good agreement with the QCD expectation. Similarly, mean values of the observables were compared to analytic QCD predictions where hadronisation effects are absorbed in calculable power corrections.

Item Type:
Journal Article
Journal or Publication Title:
The European Physical Journal C (EPJ C) - Particles and Fields
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
ID Code:
64135
Deposited By:
Deposited On:
15 May 2013 10:29
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jul 2020 03:56