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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 544311.0, MPI für Physik / MPI für Physik
Determination of alphaS using OPAL hadronic event shapes at sqrts = 91-209 GeV and resummed NNLO calculations
Authors:The OPAL Collaboration; Abbiendi, G.; et al.
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:Hadronic event shape distributions from \epem\ annihilation
measured by the OPAL experiment at centre-of-mass energies between 91~GeV and 209~GeV are used to determine the strong coupling alpha_S. The results are based on QCD predictions complete to the next-to-next-to-leading order (NNLO), and on NNLO calculations matched to the resummed next-to-leading-log-approximation terms (NNLO+NLLA). The combined NNLO result from all variables and centre-of-mass energies is

alpha_S(MZ) = 0.1201 ± 0.0008(stat.) ± 0.0013(exp.) ± 0.0010(had.) ± 0.0024(theo.)

while the combined NNLO+NLLA result is

alpha_S(MZ) = 0.1189 ± 0.0008(stat.) ± 0.0016(exp.) ± 0.0010(had.) ± 0.0036(theo.).

The completeness of the NNLO and NNLO+NLLA results with respect to missing higher order contributions,
studied by varying the renormalization scale,
is improved compared to previous results based on NLO or NLO+NLLA predictions only. The observed energy dependence of alpha_S agrees with the QCD prediction of asymptotic freedom and excludes the absence of running.
Classification / Thesaurus:OPAL
Comment of the Author/Creator:Submitted to Eur. Phys. J. C.
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2010-283
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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