Show simple item record

dc.contributor.authorAdare, Andrew Marshall
dc.contributor.authorAfanasiev, Sergey V.
dc.contributor.authorAidala, Christine A.
dc.contributor.authorAjitanand, N. N.
dc.contributor.authorAkiba, Yasuyuki
dc.contributor.authorAl-Bataineh, H.
dc.contributor.authorBaksay, Gyöngyi
dc.contributor.authorBaksay, László A.
dc.contributor.authorHohlmann, Marcus
dc.contributor.authorRembeczki, S.
dc.date.accessioned2018-01-08T16:41:35Z
dc.date.available2018-01-08T16:41:35Z
dc.date.issued2009
dc.identifier.citationAdare, A.Gluon-Spin contribution to the proton spin from the double-helicity asymmetry in inclusive π0 production in polarized p+p collisions at s=200GeV (2009) Physical Review Letters, 103 (1), art. no. 012003, . Cited 75 times.en_US
dc.identifier.urihttp://hdl.handle.net/11141/2262
dc.descriptionDeep inelastic scattering, Helicities, Momentum fraction, Neutral pions, Next-to-leading orders, Proton spinsen_US
dc.description.abstractThe double helicity asymmetry in neutral pion production for pT=1 to 12GeV/c was measured with the PHENIX experiment to access the gluon-spin contribution, ΔG, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of μ2=4GeV2 a next to leading order QCD analysis gives ΔG[0.02,0.3]=0.2, with a constraint of -0.7<ΔG[0. 02,0.3]<0.5 at Δχ2=9 (∼3σ) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the ΔG constraint on the choice of the theoretical scale, a dominant uncertainty in these predictions. © 2009 The American Physical Society.en_US
dc.language.isoen_USen_US
dc.rights© 2009 American Physical Society (APS)en_US
dc.rights.urihttps://journals.aps.org/authors/transfer-of-copyright-agreementen_US
dc.titleGluon-Spin contribution to the proton spin from the double-helicity asymmetry in inclusive π0 production in polarized p+p collisions at s=200GeVen_US
dc.typeArticleen_US
dc.identifier.doi10.1103/PhysRevLett.103.012003


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record