Open AccessCompass Measurement of g1 and QCD Fits
Author(s) -
Fabienne Kunne
Publication year - 2016
Publication title -
international journal of modern physics conference series
Language(s) - English
Resource type - Journals
ISSN - 2010-1945
DOI - 10.1142/s201019451660017x
Subject(s) - compass , physics , quantum chromodynamics , particle physics , proton , singlet state , distribution (mathematics) , spin (aerodynamics) , deuterium , distribution function , function (biology) , nuclear physics , mathematics , quantum mechanics , mathematical analysis , evolutionary biology , biology , excited state , thermodynamics
We present the latest COMPASS results on the proton spin structure function g1p(x) at 200GeV. The data improve the statistical precision by a factor of ∼2 at low x. A reevaluation of the Bjorken sum rule based on COMPASS proton and deuteron data confirms its validation to a 9% accuracy. Finally, results from a global NLO QCD fit of g1 world data are shown. The extracted spin singlet distribution leads to an integrated value of 0.26 < ΔΣ < 0.34 at Q2 = 3 (GeV/c)2. The large uncertainty is mainly driven by the unknown shape of the distribution.
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