https://doi.org/10.1140/epjc/s10052-025-14743-4
Letter
QCD lambda parameter from gradient flow
1
Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
2
II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
Received:
25
April
2025
Accepted:
9
September
2025
Published online:
17
September
2025
Starting from the running coupling in the gradient flow scheme, the QCD lambda parameter 
is determined analytically with respect to the reference scale 
in the pure gauge theory. A key element is the gluon condensate, which, being invariant under RG transformations, establishes a formal relationship between and . Good agreement with numerical estimates is found.
© The Author(s) 2025
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