Monte Carlo simulation of Thrust, C-parameter, and inclusive hadron spectra at 91-365 GeV with alpha_s extraction from NNLO fits and background distortion studies.
Measurement of alpha_s in radiative hadronic events at OPAL
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abstract
Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around $\Mz$ with the OPAL detector at LEP. The strong coupling $\as$ is extracted by fitting event shape variables for the reduced centre-of-mass energies ranging from 20 GeV to 80 GeV, and the energy dependence of $\as$ is studied. Combining all the values using different event shape variables and energies gives: \asmz=0.1176\pm 0.0012(stat.)^{+0.0093}_{-0.0085}(syst.).
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Event shapes and Inclusive Hadron Spectra at FCC-ee energies
Monte Carlo simulation of Thrust, C-parameter, and inclusive hadron spectra at 91-365 GeV with alpha_s extraction from NNLO fits and background distortion studies.