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Author Rojo, Juan ♦ Guffanti, Alberto ♦ Bertone, Valerio ♦ Ball, Richard D. ♦ Ubiali, Maria ♦ Del Debbio, Luigi ♦ Forte, Stefano ♦ Lionetti, Simone ♦ Latorre, Jose I.
Source CERN Document Server
Content type Text
File Format PDF
Date Created 2011-10-14
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Modern physics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Particle Physics - Phenomenology
Abstract We determine the strong coupling alpha_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 alpha_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 alpha_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 alpha_s is somewhat lower, but consistent within one sigma with the global determination. We estimate the dominant theoretical uncertainty, from higher orders corrections, to be Delta alpha_s (pert) 0.0009.
Description Presented at: Phys. Lett. B 707 (2012) 66-71
Collaboration with: NNPDF
Learning Resource Type Article
Publisher Date 2011-01-01
Rights License Preprint: © 2011-2018 CERN (License: CC-BY-3.0)
Page Count 11