Abstract
We present a determination of the strong coupling constant αs(mZ) based on the NNPDF3.1 determination of parton distributions, which for the first time includes constraints from jet production, top-quark pair differential distributions, and the ZpT distributions using exact NNLO theory. Our result is based on a novel extension of the NNPDF methodology – the correlated replica method – which allows for a simultaneous determination of αs and the PDFs with all correlations between them fully taken into account. We study in detail all relevant sources of experimental, methodological and theoretical uncertainty. At NNLO we find αs(mZ) = 0.1185 ± 0. 0005 (exp)± 0. 0001 (meth), showing that methodological uncertainties are negligible. We conservatively estimate the theoretical uncertainty due to missing higher order QCD corrections (N3LO and beyond) from half the shift between the NLO and NNLO αs values, finding Δαsth=0.0011.
| Original language | English |
|---|---|
| Article number | 408 |
| Pages (from-to) | 1-16 |
| Number of pages | 16 |
| Journal | European Physical Journal C |
| Volume | 78 |
| Issue number | 5 |
| Early online date | 24 May 2018 |
| DOIs | |
| Publication status | Published - May 2018 |
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Bibliographical note
NNPDF CollaborationKeywords
- hep-ph
- hep-ex
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Precision determination of the strong coupling constant within a global PDF analysis. / Ball, Richard D.; Carrazza, Stefano; Debbio, Luigi Del; Forte, Stefano; Kassabov, Zahari; Rojo, Juan; Slade, Emma; Ubiali, Maria.
In: European Physical Journal C, Vol. 78, No. 5, 408, 05.2018, p. 1-16.Research output: Contribution to Journal › Article › Academic › peer-review
TY - JOUR
T1 - Precision determination of the strong coupling constant within a global PDF analysis
AU - Ball, Richard D.
AU - Carrazza, Stefano
AU - Debbio, Luigi Del
AU - Forte, Stefano
AU - Kassabov, Zahari
AU - Rojo, Juan
AU - Slade, Emma
AU - Ubiali, Maria
N1 - NNPDF Collaboration
PY - 2018/5
Y1 - 2018/5
N2 - We present a determination of the strong coupling constant αs(mZ) based on the NNPDF3.1 determination of parton distributions, which for the first time includes constraints from jet production, top-quark pair differential distributions, and the ZpT distributions using exact NNLO theory. Our result is based on a novel extension of the NNPDF methodology – the correlated replica method – which allows for a simultaneous determination of αs and the PDFs with all correlations between them fully taken into account. We study in detail all relevant sources of experimental, methodological and theoretical uncertainty. At NNLO we find αs(mZ) = 0.1185 ± 0. 0005 (exp)± 0. 0001 (meth), showing that methodological uncertainties are negligible. We conservatively estimate the theoretical uncertainty due to missing higher order QCD corrections (N3LO and beyond) from half the shift between the NLO and NNLO αs values, finding Δαsth=0.0011.
AB - We present a determination of the strong coupling constant αs(mZ) based on the NNPDF3.1 determination of parton distributions, which for the first time includes constraints from jet production, top-quark pair differential distributions, and the ZpT distributions using exact NNLO theory. Our result is based on a novel extension of the NNPDF methodology – the correlated replica method – which allows for a simultaneous determination of αs and the PDFs with all correlations between them fully taken into account. We study in detail all relevant sources of experimental, methodological and theoretical uncertainty. At NNLO we find αs(mZ) = 0.1185 ± 0. 0005 (exp)± 0. 0001 (meth), showing that methodological uncertainties are negligible. We conservatively estimate the theoretical uncertainty due to missing higher order QCD corrections (N3LO and beyond) from half the shift between the NLO and NNLO αs values, finding Δαsth=0.0011.
KW - hep-ph
KW - hep-ex
UR - http://www.scopus.com/inward/record.url?scp=85047560563&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85047560563&partnerID=8YFLogxK
U2 - 10.1140/epjc/s10052-018-5897-7
DO - 10.1140/epjc/s10052-018-5897-7
M3 - Article
VL - 78
SP - 1
EP - 16
JO - European Physical Journal C. Particles and Fields
JF - European Physical Journal C. Particles and Fields
SN - 1434-6044
IS - 5
M1 - 408
ER -