CERN Accelerating science

Article
Report number arXiv:0902.1128 ; CERN-PH-EP-2007-032 ; CERN-PH-EP-2007-032
Title Measurement of αs with Radiative Hadronic Events
Author(s) OPAL Collaboration  Vis alle 209 forfattere
Affiliation (Birmingham U.) ; (Bologne U.) ; (INFN, Bologne) ; (Bonn U.) ; (UC, Riverside) ; (Cambridge U.) ; (Ottawa Carleton Inst. Phys.) ; (Carleton U.) ; (CERN) ; (Chicago U., EFI) ; (Freiburg U.) ; (Heidelberg U.) ; (Indiana U.) ; (Queen Mary, U. of London) ; (Aachen, Tech. Hochsch.) ; (University Coll. London) ; (Manchester U.) ; (Maryland U.) ; (Montreal U.) ; (Oregon U.) ; (Rutherford) ; (Technion) ; (Tel Aviv U.) ; (Tokyo U., ICEPP) ; (Weizmann Inst.) ; (Hamburg U.) ; (DESY) ; (Victoria U.) ; (British Columbia U.) ; (Alberta U.) ; (Budapest, RMKI) ; (Debrecen, Inst. Nucl. Res.) ; (Munich U.) ; (Munich, Max Planck Inst.) ; (Yale U.)
Publication 2008
Imprint 05 Sep 2007
Number of pages 31
Note Comments: No of pages 31 - No of figures 10
No of pages 31 - No of figures 10
In: Eur. Phys. J. C 53 (2008) 21-39
DOI 10.1140/epjc/s10052-007-0470-9
Subject category Particle Physics - Experiment ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; OPAL
Free keywords OPAL ; Radiative ; Hadronic
Abstract Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around the mass of the Z0 boson with the OPAL detector at LEP. The strong coupling alpha S is extracted by comparing data and QCD predictions for event shape observables at average reduced centre-of-mass energies ranging from 24 GeV to 78 GeV, and the energy dependence of alpha S is studied. Our results are consistent with the running of alpha S as predicted by QCD and show that within the uncertainties of our analysis event shapes in hadronic Z0 decays with hard and isolated photon radiation can be described by QCD at reduced centre-of-mass energies. Combining all values from different event shape observables and energies gives alpha S (Mz)=0.1182 pm 0.0015(stat.) pm 0.0101(syst.).

Corresponding record in: Inspire
Email contact: dawn.hudson@cern.ch


 Element opprettet 2009-02-05, sist endret 2023-03-12


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