Measurement of the strong coupling alpha_s from the 3-jet rate in e+e- annihilation using JADE data

TL;DR

This paper measures the strong coupling constant alpha_s at the Z boson mass scale using 3-jet rates from e+e- annihilation data collected by JADE, comparing results with advanced QCD predictions.

Contribution

It provides a precise extraction of alpha_s(m_Z) from JADE data using NNLO and NNLA calculations, demonstrating good agreement with theoretical predictions.

Findings

Alpha_s(m_Z) = 0.1199 +/- 0.0010 (stat.) +/- 0.0021 (exp.) +/- 0.0054 (had.) +/- 0.0007 (theo.)

Good agreement between data and NNLO+NNLA QCD predictions

Supports the validity of QCD in describing jet formation in e+e- annihilation.

Abstract

We describe a measurement of the strong coupling alpha_S(m_Z) from the 3-jet rate in hadronic final states of e+e- annihilation recorded with the JADE detector at centre-of-mass energies of 14 to 44 GeV. The jets are reconstructed with the Durham jet clustering algorithm. The JADE 3-jet rate data are compared with QCD predictions in NNLO combined with resummed NNLA calculations. We find good agreement between the data and the prediction and extract alpha_S(m_Z)= 0.1199 +/- 0.0010(stat.) +/- 0.0021(exp.) +/- 0.0054(had.) +/- 0.0007(theo.).