Precision NNLO determination of alpha(s)(M-Z) using an unbiased global parton set

R.D. Ball; L. Del Debbio; V. Bertone; S. Forte; Alberto Guffanti; J.I. Latorre; S. Lionetti; J. Rojo; M. Ubiali

doi:10.1016/j.physletb.2011.11.053

Precision NNLO determination of alpha(s)(M-Z) using an unbiased global parton set

R.D. Ball, L. Del Debbio, V. Bertone, S. Forte, Alberto Guffanti, J.I. Latorre, S. Lionetti, J. Rojo, M. Ubiali

Eksperimentel subatomar fysik

53 Citationer (Scopus)

Abstract

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.

Originalsprog	Engelsk
Tidsskrift	Physics Letters B
Vol/bind	707
Udgave nummer	1
Sider (fra-til)	66-71
Antal sider	5
ISSN	0370-2693
DOI	https://doi.org/10.1016/j.physletb.2011.11.053
Status	Udgivet - 16 jan. 2012

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10.1016/j.physletb.2011.11.053

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Ball, R. D., Del Debbio, L., Bertone, V., Forte, S., Guffanti, A., Latorre, J. I., Lionetti, S., Rojo, J., & Ubiali, M. (2012). Precision NNLO determination of alpha(s)(M-Z) using an unbiased global parton set. Physics Letters B, 707(1), 66-71. https://doi.org/10.1016/j.physletb.2011.11.053

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title = "Precision NNLO determination of alpha(s)(M-Z) using an unbiased global parton set",

abstract = "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.",

author = "R.D. Ball and {Del Debbio}, L. and V. Bertone and S. Forte and Alberto Guffanti and J.I. Latorre and S. Lionetti and J. Rojo and M. Ubiali",

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doi = "10.1016/j.physletb.2011.11.053",

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T1 - Precision NNLO determination of alpha(s)(M-Z) using an unbiased global parton set

AU - Ball, R.D.

AU - Del Debbio, L.

AU - Bertone, V.

AU - Forte, S.

AU - Guffanti, Alberto

AU - Latorre, J.I.

AU - Lionetti, S.

AU - Rojo, J.

AU - Ubiali, M.

PY - 2012/1/16

Y1 - 2012/1/16

N2 - 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.

AB - 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.

U2 - 10.1016/j.physletb.2011.11.053

DO - 10.1016/j.physletb.2011.11.053

M3 - Journal article

SN - 0370-2693

VL - 707

SP - 66

EP - 71

JO - Physics Letters B

JF - Physics Letters B

IS - 1

ER -

Precision NNLO determination of alpha(s)(M-Z) using an unbiased global parton set

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