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Moments of the Spin Structure Functions g_1^p and g_1^d for 0.05 < Q^2 < 3.0 GeV^2

Prok, Y. ; Bosted, P. ; Burkert, V. D. ; Deur, A. ; Dharmawardane, K. V. ; Dodge, G. E. ; Griffioen, K. A. ; Kuhn, S. E. ; Minehart, R. ; Collaboration, The Clas

Phys.Lett.B672:12-16,2009 [Periódico revisado por pares]

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  • Título:
    Moments of the Spin Structure Functions g_1^p and g_1^d for 0.05 < Q^2 < 3.0 GeV^2
  • Autor: Prok, Y. ; Bosted, P. ; Burkert, V. D. ; Deur, A. ; Dharmawardane, K. V. ; Dodge, G. E. ; Griffioen, K. A. ; Kuhn, S. E. ; Minehart, R. ; Collaboration, The Clas
  • Assuntos: Nuclear Experiment
  • É parte de: Phys.Lett.B672:12-16,2009
  • Descrição: The spin structure functions g_1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH_3 and ND_3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 < Q^2 < 5 GeV^2 and W < 3 GeV. The first moments of g_1 for the proton and deuteron are presented -- both have a negative slope at low Q^2, as predicted by the extended Gerasimov-Drell-Hearn sum rule. The first result for the generalized forward spin polarizability of the proton gamma_0^p is also reported. This quantity shows strong Q^2 dependence at low Q^2, while Q^6\gamma_0^p seems to flatten out at the highest Q^2 accessed by our experiment. Although the first moments of g_1 are consistent with Chiral Perturbation Theory (ChPT) calculations up to approximately Q^2 = 0.06 GeV^2, a significant discrepancy is observed between the \gamma_0^p data and ChPT for gamma_0^p, even at the lowest Q2. Comment: Final version as published in PLB. Added a parametrization of world data at high Q^2 to Fig. 3

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