Precision NNLO determination of α s(M Z) using an unbiased global parton set
We determine the strong coupling α s at NNLO in perturbative QCD using the global dataset input to the NNPDF2.1 NNLO parton fit: data from neutral and charged current deep-inelastic scattering, Drell-Yan, vector boson production and inclusive jets. We find α s(M Z)=0.1173±0.0007 stat, where the stat...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2012
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| _version_ | 1797079509820768256 |
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| author | Ball, R Bertone, V Del Debbio, L Forte, S Guffanti, A Latorre, J Lionetti, S Rojo, J Ubiali, M |
| author_facet | Ball, R Bertone, V Del Debbio, L Forte, S Guffanti, A Latorre, J Lionetti, S Rojo, J Ubiali, M |
| author_sort | Ball, R |
| collection | OXFORD |
| description | We determine the strong coupling α s at NNLO in perturbative QCD using the global dataset input to the NNPDF2.1 NNLO parton fit: data from neutral and charged current deep-inelastic scattering, Drell-Yan, vector boson production and inclusive jets. We find α s(M Z)=0.1173±0.0007 stat, where the statistical uncertainty comes from the underlying data and uncertainties due to the analysis procedure are negligible. We show that the distribution of α s values preferred by different experiments in the global fit is statistically consistent, without need for rescaling uncertainties by a "tolerance" factor. We show that if deep-inelastic data only are used, the best-fit value of α s is somewhat lower, but consistent within one sigma with the global determination. We find that the shift between the NLO and NNLO values of α s is δαspert=0.0018, and we estimate the uncertainty from higher-order corrections to be δαsNNLO~0.0009. © 2011 Elsevier B.V. |
| first_indexed | 2024-03-07T00:46:55Z |
| format | Journal article |
| id | oxford-uuid:8500ced6-e151-4143-b9c8-e5798bfaad1b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:46:55Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:8500ced6-e151-4143-b9c8-e5798bfaad1b2022-03-26T21:54:39ZPrecision NNLO determination of α s(M Z) using an unbiased global parton setJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8500ced6-e151-4143-b9c8-e5798bfaad1bEnglishSymplectic Elements at Oxford2012Ball, RBertone, VDel Debbio, LForte, SGuffanti, ALatorre, JLionetti, SRojo, JUbiali, MWe determine the strong coupling α s at NNLO in perturbative QCD using the global dataset input to the NNPDF2.1 NNLO parton fit: data from neutral and charged current deep-inelastic scattering, Drell-Yan, vector boson production and inclusive jets. We find α s(M Z)=0.1173±0.0007 stat, where the statistical uncertainty comes from the underlying data and uncertainties due to the analysis procedure are negligible. We show that the distribution of α s values preferred by different experiments in the global fit is statistically consistent, without need for rescaling uncertainties by a "tolerance" factor. We show that if deep-inelastic data only are used, the best-fit value of α s is somewhat lower, but consistent within one sigma with the global determination. We find that the shift between the NLO and NNLO values of α s is δαspert=0.0018, and we estimate the uncertainty from higher-order corrections to be δαsNNLO~0.0009. © 2011 Elsevier B.V. |
| spellingShingle | Ball, R Bertone, V Del Debbio, L Forte, S Guffanti, A Latorre, J Lionetti, S Rojo, J Ubiali, M Precision NNLO determination of α s(M Z) using an unbiased global parton set |
| title | Precision NNLO determination of α s(M Z) using an unbiased global parton set |
| title_full | Precision NNLO determination of α s(M Z) using an unbiased global parton set |
| title_fullStr | Precision NNLO determination of α s(M Z) using an unbiased global parton set |
| title_full_unstemmed | Precision NNLO determination of α s(M Z) using an unbiased global parton set |
| title_short | Precision NNLO determination of α s(M Z) using an unbiased global parton set |
| title_sort | precision nnlo determination of α s m z using an unbiased global parton set |
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