mb from ALEPH and comparison with other LEP experiments

TL;DR

This paper reviews measurements of the $b$-quark mass by ALEPH and DELPHI at LEP, demonstrating the running of the mass as predicted by QCD and comparing results at different energy scales.

Contribution

It provides a comprehensive analysis of $b$-quark mass measurements using various observables and jet algorithms, confirming the QCD prediction of mass running at the $Z$ pole.

Findings

Clear evidence of $b$-quark mass running observed

Measurements at the $Z$ pole are consistent with QCD predictions

Comparison with $$Upsilon(4S)$$ threshold results supports the mass evolution theory

Abstract

I will review the measurements of the $b$-quark mass performed by ALEPH and DELPHI. A large set of observables has been used together with detailed studies on jet algorithms. Very clear effects due to the $b$-quark mass running are observed. Comparing with the determinations at the $\Upsilon(4S)$ threshold, the measurements of the running $b$-quark mass at the $Z$ pole are consistent with the predicted evolution from QCD.