Precision determination of alpha_s using an unbiased global NLO parton set

Simone Lionetti, Richard D. Ball, Valerio Bertone, Francesco Cerutti, Luigi Del Debbio, Stefano Forte, Alberto Guffanti, Jose I. Latorre, Juan Rojo, Maria Ubiali

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

We determine the strong coupling as from a next-to-leading order analysis of processes used for the NNPDF2.1 parton determination, which includes data from neutral and charged current deep-inelastic scattering, Drell-Yan and inclusive jet production. We find alpha(S)(M-Z) = 0.1191 +/- 0.0006(exp), where the uncertainty includes all statistical and systematic experimental uncertainties, but not purely theoretical uncertainties, which are expected to be rather larger. We study the dependence of the results on the dataset, by providing further determinations based respectively on deep-inelastic data only, and on HERA data only. The deep-inelastic fit gives the consistent result alpha(S)(M-Z) = 0.1177 +/- 0.0009(exp), but the result of the HERA-only fit is only marginally consistent. We provide evidence that individual data subsets can have runaway directions due to poorly determined PDFs, thus suggesting that a global dataset is necessary for a reliable determination. (C) 2011 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)346-352
JournalPhysics Letters B
Volume701
DOIs
Publication statusPublished - 11 Jul 2011

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partons
neutral currents
set theory
inelastic scattering

Bibliographical note

13 pages, 9 figures; final version to be published in Phys. Lett. B. Tolerance analysis for individual experiments (figs.6, 7 and tab.3) and fits with increased numbers of replicas (tab 1, 2) added. Many further small corrections

Keywords

  • hep-ph

Cite this

Lionetti, S., Ball, R. D., Bertone, V., Cerutti, F., Debbio, L. D., Forte, S., ... Ubiali, M. (2011). Precision determination of alpha_s using an unbiased global NLO parton set. Physics Letters B, 701, 346-352. https://doi.org/10.1016/j.physletb.2011.05.071
Lionetti, Simone ; Ball, Richard D. ; Bertone, Valerio ; Cerutti, Francesco ; Debbio, Luigi Del ; Forte, Stefano ; Guffanti, Alberto ; Latorre, Jose I. ; Rojo, Juan ; Ubiali, Maria. / Precision determination of alpha_s using an unbiased global NLO parton set. In: Physics Letters B. 2011 ; Vol. 701. pp. 346-352.
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Lionetti, S, Ball, RD, Bertone, V, Cerutti, F, Debbio, LD, Forte, S, Guffanti, A, Latorre, JI, Rojo, J & Ubiali, M 2011, 'Precision determination of alpha_s using an unbiased global NLO parton set' Physics Letters B, vol. 701, pp. 346-352. https://doi.org/10.1016/j.physletb.2011.05.071

Precision determination of alpha_s using an unbiased global NLO parton set. / Lionetti, Simone; Ball, Richard D.; Bertone, Valerio; Cerutti, Francesco; Debbio, Luigi Del; Forte, Stefano; Guffanti, Alberto; Latorre, Jose I.; Rojo, Juan; Ubiali, Maria.

In: Physics Letters B, Vol. 701, 11.07.2011, p. 346-352.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - Precision determination of alpha_s using an unbiased global NLO parton set

AU - Lionetti, Simone

AU - Ball, Richard D.

AU - Bertone, Valerio

AU - Cerutti, Francesco

AU - Debbio, Luigi Del

AU - Forte, Stefano

AU - Guffanti, Alberto

AU - Latorre, Jose I.

AU - Rojo, Juan

AU - Ubiali, Maria

N1 - 13 pages, 9 figures; final version to be published in Phys. Lett. B. Tolerance analysis for individual experiments (figs.6, 7 and tab.3) and fits with increased numbers of replicas (tab 1, 2) added. Many further small corrections

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N2 - We determine the strong coupling as from a next-to-leading order analysis of processes used for the NNPDF2.1 parton determination, which includes data from neutral and charged current deep-inelastic scattering, Drell-Yan and inclusive jet production. We find alpha(S)(M-Z) = 0.1191 +/- 0.0006(exp), where the uncertainty includes all statistical and systematic experimental uncertainties, but not purely theoretical uncertainties, which are expected to be rather larger. We study the dependence of the results on the dataset, by providing further determinations based respectively on deep-inelastic data only, and on HERA data only. The deep-inelastic fit gives the consistent result alpha(S)(M-Z) = 0.1177 +/- 0.0009(exp), but the result of the HERA-only fit is only marginally consistent. We provide evidence that individual data subsets can have runaway directions due to poorly determined PDFs, thus suggesting that a global dataset is necessary for a reliable determination. (C) 2011 Elsevier B.V. All rights reserved.

AB - We determine the strong coupling as from a next-to-leading order analysis of processes used for the NNPDF2.1 parton determination, which includes data from neutral and charged current deep-inelastic scattering, Drell-Yan and inclusive jet production. We find alpha(S)(M-Z) = 0.1191 +/- 0.0006(exp), where the uncertainty includes all statistical and systematic experimental uncertainties, but not purely theoretical uncertainties, which are expected to be rather larger. We study the dependence of the results on the dataset, by providing further determinations based respectively on deep-inelastic data only, and on HERA data only. The deep-inelastic fit gives the consistent result alpha(S)(M-Z) = 0.1177 +/- 0.0009(exp), but the result of the HERA-only fit is only marginally consistent. We provide evidence that individual data subsets can have runaway directions due to poorly determined PDFs, thus suggesting that a global dataset is necessary for a reliable determination. (C) 2011 Elsevier B.V. All rights reserved.

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VL - 701

SP - 346

EP - 352

JO - Physics Letters B

JF - Physics Letters B

SN - 0370-2693

ER -

Lionetti S, Ball RD, Bertone V, Cerutti F, Debbio LD, Forte S et al. Precision determination of alpha_s using an unbiased global NLO parton set. Physics Letters B. 2011 Jul 11;701:346-352. https://doi.org/10.1016/j.physletb.2011.05.071