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The determination of $\alpha_s$ by the ALPHA collaboration
We review the ALPHA collaboration strategy for obtaining the QCD coupling at high scale. In the three-flavor effective theory it avoids the use of perturbation theory at $\alpha > 0.2$ and at the same time has the physical scales small compared to the cutoff $1/a$ in all stages of the computation...
| Autores principales: | , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2016
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1016/j.nuclphysbps.2017.03.024 http://cds.cern.ch/record/2233843 |
| _version_ | 1780952741068144640 |
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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 review the ALPHA collaboration strategy for obtaining the QCD coupling at high scale. In the three-flavor effective theory it avoids the use of perturbation theory at $\alpha > 0.2$ and at the same time has the physical scales small compared to the cutoff $1/a$ in all stages of the computation. The result $\Lambda_\overline{MS}^{(3)}=332(14)$~MeV is translated to $\alpha_\overline{MS}(m_Z)=0.1179(10)(2)$ by use of (high order) perturbative relations between the effective theory couplings at the charm and beauty quark 'thresholds'. The error of this perturbative step is discussed and estimated as $0.0002$. |
| id | cern-2233843 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2016 |
| record_format | invenio |
| spelling | cern-22338432023-08-11T04:11:32Zdoi:10.1016/j.nuclphysbps.2017.03.024http://cds.cern.ch/record/2233843engBruno, MattiaDalla Brida, MattiaFritzsch, PatrickKorzec, TomaszRamos, AlbertoSchaefer, StefanSimma, HubertSint, StefanSommer, RainerThe determination of $\alpha_s$ by the ALPHA collaborationhep-phParticle Physics - Phenomenologyhep-latParticle Physics - LatticeWe review the ALPHA collaboration strategy for obtaining the QCD coupling at high scale. In the three-flavor effective theory it avoids the use of perturbation theory at $\alpha > 0.2$ and at the same time has the physical scales small compared to the cutoff $1/a$ in all stages of the computation. The result $\Lambda_\overline{MS}^{(3)}=332(14)$~MeV is translated to $\alpha_\overline{MS}(m_Z)=0.1179(10)(2)$ by use of (high order) perturbative relations between the effective theory couplings at the charm and beauty quark 'thresholds'. The error of this perturbative step is discussed and estimated as $0.0002$.We review the ALPHA collaboration strategy for obtaining the QCD coupling at high scale. In the three-flavor effective theory it avoids the use of perturbation theory at α∼>0.2 and at the same time has the physical scales small compared to the cutoff 1/ a in all stages of the computation. The result ΛMS‾(3)=332(14)MeV is translated to αMS‾(mZ)=0.1179(10)(2) by use of (high order) perturbative relations between the effective theory couplings at the charm and beauty quark “thresholds”. The error of this perturbative step is discussed and estimated as 0.0002.We review the ALPHA collaboration strategy for obtaining the QCD coupling at high scale. In the three-flavor effective theory it avoids the use of perturbation theory at $\alpha > 0.2$ and at the same time has the physical scales small compared to the cutoff $1/a$ in all stages of the computation. The result $\Lambda_\overline{MS}^{(3)}=332(14)$~MeV is translated to $\alpha_\overline{MS}(m_Z)=0.1179(10)(2)$ by use of (high order) perturbative relations between the effective theory couplings at the charm and beauty quark "thresholds". The error of this perturbative step is discussed and estimated as $0.0002$.arXiv:1611.05750DESY-16-214CERN-TH-2016-236IFT-UAM-CSIC-16-119oai:cds.cern.ch:22338432016-11-17 |
| spellingShingle | hep-ph Particle Physics - Phenomenology 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 determination of $\alpha_s$ by the ALPHA collaboration |
| title | The determination of $\alpha_s$ by the ALPHA collaboration |
| title_full | The determination of $\alpha_s$ by the ALPHA collaboration |
| title_fullStr | The determination of $\alpha_s$ by the ALPHA collaboration |
| title_full_unstemmed | The determination of $\alpha_s$ by the ALPHA collaboration |
| title_short | The determination of $\alpha_s$ by the ALPHA collaboration |
| title_sort | determination of $\alpha_s$ by the alpha collaboration |
| topic | hep-ph Particle Physics - Phenomenology hep-lat Particle Physics - Lattice |
| url | https://dx.doi.org/10.1016/j.nuclphysbps.2017.03.024 http://cds.cern.ch/record/2233843 |
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