TL;DR
This study reanalyzed old JADE e+e- collision data to test QCD predictions by examining 4-jet rates and event shape moments, extracting the strong coupling constant, and comparing results with theoretical models.
Contribution
It provides new QCD tests using historical data, applying advanced NLO and NLLA calculations to measure the strong coupling constant.
Findings
Measured alpha_S(M_Z) from 4-jet rate: 0.1169 +/- 0.0026
Measured alpha_S(M_Z) from moments: 0.1286 +/- 0.0072
Results are consistent with the world average, with some systematic discrepancies in higher moments.
Abstract
Data from e+e- annihilation into hadrons collected by the JADE experiment at centre-of-mass energies between 14 and 44 GeV were used to study the 4-jet rate using the Durham algorithm as well as the first five moments of event shape observables. The data were compared with NLO QCD predictions, augmented by resummed NLLA calculations for the 4-jet rate, in order to extract values of the strong coupling constant alpha_S. The preliminary results are alpha_S(M_Z) = 0.1169 +/- 0.0026 (4-jet rate) and alpha_S(M_Z) = 0.1286 +/- 0.0072 (moments) consistent with the world average value. For some of the higher moments systematic deficiencies of the QCD predictions are observed.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · High-Energy Particle Collisions Research · Computational Physics and Python Applications