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Measurement of αs from the structure of particle clusters produced in hadronic Z decays

Decamp, D. and Finch, Alexander (1991) Measurement of αs from the structure of particle clusters produced in hadronic Z decays. Physics Letters B, 257 (3-4). pp. 479-491. ISSN 0370-2693

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Abstract

Using 106 000 hadronic events obtained with the ALEPH detector at LEP at energies close to the Z resonance peak, the strong coupling constant αs is measured by an analysis of energy-energy correlations (EEC) and the global event shape variables thrust, C-parameter and oblateness. It is shown that the theoretical uncertainties can be significantly reduced if the final state particles are first combined in clusters using a minimum scaled invariant mass cut, Ycut, before these variables are computed. The combined result from all shape variables of pre-clustered events is αs(MZ2 = 0.117±0.005 for a renormalization scale . For μ values between MZ and the b-quark mass, the result changes by −0.009+0.006.

Item Type: Article
Journal or Publication Title: Physics Letters B
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63799
Deposited By: ep_importer_pure
Deposited On: 02 May 2013 16:47
Refereed?: Yes
Published?: Published
Last Modified: 30 Aug 2017 14:04
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63799

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