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The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration
We present results by the ALPHA collaboration for the $\Lambda$-parameter in 3-flavour QCD and the strong coupling constant at the electroweak scale, $\alpha_s(m_Z)$, in terms of hadronic quantities computed on the CLS gauge configurations. The first part of this proceedings contribution contains a...
| Autores principales: | , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
SISSA
2017
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.22323/1.256.0197 http://cds.cern.ch/record/2242539 |
| _version_ | 1780953269235875840 |
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| author | Bruno, M. Dalla Brida, M. Fritzsch, P. Korzec, T. Ramos, A. Schaefer, S. Simma, H. Sint, S. Sommer, R. |
| author_facet | Bruno, M. Dalla Brida, M. Fritzsch, P. Korzec, T. Ramos, A. Schaefer, S. Simma, H. Sint, S. Sommer, R. |
| author_sort | Bruno, M. |
| collection | CERN |
| description | We present results by the ALPHA collaboration for the $\Lambda$-parameter in 3-flavour QCD and the strong coupling constant at the electroweak scale, $\alpha_s(m_Z)$, in terms of hadronic quantities computed on the CLS gauge configurations. The first part of this proceedings contribution contains a review of published material \cite{Brida:2016flw,DallaBrida:2016kgh} and yields the $\Lambda$-parameter in units of a low energy scale, $1/L_{\rm had}$. We then discuss how to determine this scale in physical units from experimental data for the pion and kaon decay constants. We obtain $\Lambda_{\overline{\rm MS}}^{(3)} = 332(14)$ MeV which translates to $\alpha_s(M_Z)=0.1179(10)(2)$ using perturbation theory to match between 3-, 4- and 5-flavour QCD. |
| id | cern-2242539 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2017 |
| publisher | SISSA |
| record_format | invenio |
| spelling | cern-22425392023-08-11T04:19:36Zdoi:10.22323/1.256.0197http://cds.cern.ch/record/2242539engBruno, M.Dalla Brida, M.Fritzsch, P.Korzec, T.Ramos, A.Schaefer, S.Simma, H.Sint, S.Sommer, R.The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaborationhep-phParticle Physics - Phenomenologyhep-latParticle Physics - LatticeWe present results by the ALPHA collaboration for the $\Lambda$-parameter in 3-flavour QCD and the strong coupling constant at the electroweak scale, $\alpha_s(m_Z)$, in terms of hadronic quantities computed on the CLS gauge configurations. The first part of this proceedings contribution contains a review of published material \cite{Brida:2016flw,DallaBrida:2016kgh} and yields the $\Lambda$-parameter in units of a low energy scale, $1/L_{\rm had}$. We then discuss how to determine this scale in physical units from experimental data for the pion and kaon decay constants. We obtain $\Lambda_{\overline{\rm MS}}^{(3)} = 332(14)$ MeV which translates to $\alpha_s(M_Z)=0.1179(10)(2)$ using perturbation theory to match between 3-, 4- and 5-flavour QCD.SISSAarXiv:1701.03075CERN-TH-2016-262DESY-17-007oai:cds.cern.ch:22425392017-01-11 |
| spellingShingle | hep-ph Particle Physics - Phenomenology hep-lat Particle Physics - Lattice Bruno, M. Dalla Brida, M. Fritzsch, P. Korzec, T. Ramos, A. Schaefer, S. Simma, H. Sint, S. Sommer, R. The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration |
| title | The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration |
| title_full | The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration |
| title_fullStr | The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration |
| title_full_unstemmed | The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration |
| title_short | The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration |
| title_sort | $\lambda$-parameter in 3-flavour qcd and $\alpha_s(m_z)$ by the alpha collaboration |
| topic | hep-ph Particle Physics - Phenomenology hep-lat Particle Physics - Lattice |
| url | https://dx.doi.org/10.22323/1.256.0197 http://cds.cern.ch/record/2242539 |
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