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 experimental input values for the masses and decay constants of the pion and the kaon, we obtain ΛMS(3)=341(12) MeV. The nonperturbative running up to very high energies guarantees that systematic effects associated with perturbation theory are well under control. Using the four-loop prediction for ΛMS(5)/ΛMS(3) yields αMS(5)(mZ)=0.11852(84).
Bruno, M., Dalla Brida, M., Fritzsch, P., Korzec, T., Ramos, A., Schaefer, S., et al. (2017). QCD Coupling from a Nonperturbative Determination of the Three-Flavor Λ Parameter. PHYSICAL REVIEW LETTERS, 119(10) [10.1103/PhysRevLett.119.102001].
QCD Coupling from a Nonperturbative Determination of the Three-Flavor Λ Parameter
Bruno, M;Dalla Brida, M;
2017
Abstract
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 experimental input values for the masses and decay constants of the pion and the kaon, we obtain ΛMS(3)=341(12) MeV. The nonperturbative running up to very high energies guarantees that systematic effects associated with perturbation theory are well under control. Using the four-loop prediction for ΛMS(5)/ΛMS(3) yields αMS(5)(mZ)=0.11852(84).
| File | Dimensione | Formato | |
|---|---|---|---|
|
PhysRevLett.119.102001.pdf
Solo gestori archivio
Tipologia di allegato:
Publisher’s Version (Version of Record, VoR)
Dimensione
371.37 kB
Formato
Adobe PDF
|
371.37 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
|
10.1103_PhysRevLett.119.102001.pdf
Solo gestori archivio
Tipologia di allegato:
Publisher’s Version (Version of Record, VoR)
Dimensione
371.37 kB
Formato
Adobe PDF
|
371.37 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
