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The strong coupling from a nonperturbative determination of the $\Lambda$ parameter in three-flavor QCD
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...
| Autores principales: | , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2017
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevLett.119.102001 http://cds.cern.ch/record/2269091 |
| _version_ | 1780954696549138432 |
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| author | Bruno, Mattia Dalla Brida, Mattia Fritzsch, Patrick Korzec, Tomasz Ramos, Alberto Schaefer, Stefan Simma, Hubert Sint, Stefan Sommer, Rainer |
| author_facet | Bruno, Mattia Dalla Brida, Mattia Fritzsch, Patrick Korzec, Tomasz Ramos, Alberto Schaefer, Stefan Simma, Hubert Sint, Stefan Sommer, Rainer |
| author_sort | Bruno, Mattia |
| collection | CERN |
| description | 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). |
| id | cern-2269091 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2017 |
| record_format | invenio |
| spelling | cern-22690912023-08-11T04:26:37Zdoi:10.1103/PhysRevLett.119.102001http://cds.cern.ch/record/2269091engBruno, MattiaDalla Brida, MattiaFritzsch, PatrickKorzec, TomaszRamos, AlbertoSchaefer, StefanSimma, HubertSint, StefanSommer, RainerThe strong coupling from a nonperturbative determination of the $\Lambda$ parameter in three-flavor QCDhep-latParticle Physics - LatticeWe 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).We present a lattice determination of the $\Lambda$ 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 $0.2\,$GeV to $70\,$GeV, and using experimental input values for the masses and decay constants of the pion and the kaon, we obtain $\Lambda_{\overline{\rm MS}}^{(3)}=341(12)\,$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 $\Lambda_{\overline{\rm MS}}^{(5)}/\Lambda_{\overline{\rm MS}}^{(3)}$ yields $\alpha^{(5)}_{\overline{\rm MS}}(m_{\rm Z}) = 0.11852(84)$.arXiv:1706.03821CERN-TH-2017-129DESY-17-088WUB-17-03oai:cds.cern.ch:22690912017-06-12 |
| spellingShingle | hep-lat Particle Physics - Lattice Bruno, Mattia Dalla Brida, Mattia Fritzsch, Patrick Korzec, Tomasz Ramos, Alberto Schaefer, Stefan Simma, Hubert Sint, Stefan Sommer, Rainer The strong coupling from a nonperturbative determination of the $\Lambda$ parameter in three-flavor QCD |
| title | The strong coupling from a nonperturbative determination of the $\Lambda$ parameter in three-flavor QCD |
| title_full | The strong coupling from a nonperturbative determination of the $\Lambda$ parameter in three-flavor QCD |
| title_fullStr | The strong coupling from a nonperturbative determination of the $\Lambda$ parameter in three-flavor QCD |
| title_full_unstemmed | The strong coupling from a nonperturbative determination of the $\Lambda$ parameter in three-flavor QCD |
| title_short | The strong coupling from a nonperturbative determination of the $\Lambda$ parameter in three-flavor QCD |
| title_sort | strong coupling from a nonperturbative determination of the $\lambda$ parameter in three-flavor qcd |
| topic | hep-lat Particle Physics - Lattice |
| url | https://dx.doi.org/10.1103/PhysRevLett.119.102001 http://cds.cern.ch/record/2269091 |
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