Measurement of alpha(s) with radiative hadronic events

Christopher Hawkes, Predrag Jovanovic, T Kobayashi, David Charlton, Miriam Watson

Research output: Contribution to journalArticle

11 Citations (Scopus)


Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around the mass of the Z 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 Z 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)(M-Z)=0.1182 +/- 0.0015(stat.)+/- 0.0101(syst.).
Original languageEnglish
Pages (from-to)21-39
Number of pages19
JournalEuropean Physical Journal C
Issue number1
Publication statusPublished - 1 Jan 2008


Dive into the research topics of 'Measurement of alpha(s) with radiative hadronic events'. Together they form a unique fingerprint.

Cite this