Goodbye to large ΔG? Direct estimate of gluon polarization in the nucleon

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Abstract

We make a first crude direct estimate of the net gluon polarization in the proton, ΔG, combining data on the asymmetries in high-pT hadron production from the HERMES, SMC and COMPASS collaborations. Although these data sample a restricted range of x, they provide no hint that ΔG is large. Fixing the normalizations of different theoretical parametrizations using the hadron asymmetry data, we find typical central values of Δ G ∼ 0.5, with uncertainties of similar magnitude. Values of Δ G ≥ 2 are disfavoured by Δ χ2 ∼ 9  to  20, depending on the parametrization used.

Original languageEnglish
Pages (from-to)116-122
Number of pages7
JournalNuclear Physics B - Proceedings Supplements
Volume161
Issue numberSPEC. ISS.
DOIs
StatePublished - Nov 2006
Externally publishedYes

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