Browsing Pure & Applied Mathematics by Author "Sint, Stefan"
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Determination of the QCD ? Parameter and the Accuracy of Perturbation Theory at High Energies
Sint, Stefan; Fritzsch, Patrick (2016)We discuss the determination of the strong coupling α MS ð m Z Þ or, equivalently, the QCD Λ parameter. Its determination requires the use of perturbation theory in α s ð μ Þ in some scheme s and at some ... -
High precision renormalization of the flavour non-singlet Noether currents in lattice QCD with Wilson quarks
Sint, Stefan (SpringerOpen, 2019)We determine the non-perturbatively renormalized axial current for O(a) improved lattice QCD with Wilson quarks. Our strategy is based on the chirally rotated Schrödinger functional and can be generalized to other finite ... -
QCD Coupling from a Nonperturbative Determination of the Three-Flavor ?? Parameter
Sint, Stefan; Fritzsch, Patrick (2017)We present a lattice determination of the Λ parameter in three-flavor QCD and the strong coupling at the Z pole mass. Computing the nonperturbative running of the coupling in the range from 0.2 to 70 GeV, and using ... -
Slow running of the gradient flow coupling from 200??MeV to 4??GeV inNf=3QCD
Sint, Stefan; Fritzsch, Patrick (2017) -
Symanzik Improvement of the gradient flow in lattice gauge theories
Sint, Stefan (2015)We apply the Symanzik improvement progra- mme to the 4 + 1-dimensional local re-formulation of the gradient flow in pure SU ( N ) lattice gauge theories. We show that the classical nature of the flow equation ...