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19 April 2024

» pubmed » pmid16241646

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Q2 dependence of the neutron spin structure function g2(n) at low Q2
K Kramer ; D S Armstrong ; T D Averett ; W Bertozzi ; S Binet ; C Butuceanu ; A Camsonne ; G D Cates ; J-P Chen ; Seonho Choi ; E Chudakov ; F Cusanno ; A Deur ; P Djawotho ; D Dutta ; J M Finn ; H Gao ; F Garibaldi ; O Gayou ; R Gilman ; A Glamazdin ; V Gorbenko ; K A Griffioen ; J-O Hansen ; D W Higinbotham ; W Hinton ; T Horn ; C W de Jager ; X Jiang ; W Korsch ; J LeRose ; D Lhuillier ; N Liyanage ; D J Margaziotis ; K McCormick ; Z-E Meziani ; R Michaels ; B Milbrath ; B Moffit ; S Nanda ; C F Perdrisat ; R Pomatsalyuk ; V Punjabi ; B Reitz ; J Roche ; R Roché ; M Roedelbronn ; N Savvinov ; J Secrest ; J Singh ; S Sirca ; K Slifer ; P Solvignon ; D J Steiner ; R Suleiman ; V Sulkosky ; A Tobias ; A Vacheret ; Y Xiao ; X Zheng ; J Zhou ; L Zhu ; X Zhu ; P A Zo?nierczuk ;
Date:	30 Sep 2005
Journal:	Phys Rev Lett, 95 (14), 142002
Abstract:	We present the first measurement of the Q2 dependence of the neutron spin structure function g2(n) at five kinematic points covering 0.57 (GeV/c)2 < or = Q2 < or = 1.34 (GeV/c)2 at x approximately = 0.2. Though the naive quark-parton model predicts g2 = 0, nonzero values occur in more realistic models of the nucleon which include quark-gluon correlations, finite quark masses, or orbital angular momentum. When scattering from a noninteracting quark, g2(n) can be predicted using next-to-leading order fits to world data for g1(n). Deviations from this prediction provide an opportunity to examine QCD dynamics in nucleon structure. Our results show a positive deviation from this prediction at lower Q2, indicating that contributions such as quark-gluon interactions may be important. Precision data obtained for g1(n) are consistent with next-to-leading order fits to world data.
Source:	PubMed, pmid16241646
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