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23 April 2024

» arxiv » 0808.2183

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Measurements of polarized photo-pion production on longitudinally polarized HD and Implications for Convergence of the GDH Integral
LEGS Spin Collaboration ; S. Hoblit ; A.M. Sandorfi ; K. Ardashev ; C. Bade ; O. Bartalini ; M. Blecher ; A. Caracappa ; A. D'Angelo ; A. d'Angelo ; R. Di Salvo ; A. Fantini ; C. Gibson ; H. Glueckler ; K. Hicks ; A. Honig ; T. Kageya ; M. Khandaker ; O.C. Kistner ; S. Kizilgul ; S. Kucuker ; A. Lehmann ; M. Lowry ; M. Lucas ; J. Mahon ; L. Miceli ; D. Moricciani ; B. Norum ; M. Pap ; B. Preedom ; H. Seyfarth ; C. Schaerf ; H. Stroeher ; C.E. Thorn ; C.S. Whisnant ; K. Wang ; X. Wei ;
Date:	15 Aug 2008
Abstract:	We report new measurements of inclusive pion production from frozen-spin HD for polarized photon beams covering the Delta(1232) resonance. These provide data simultaneously on both H and D with nearly complete angular distributions of the spin-difference cross sections entering the Gerasimov-Drell-Hearn (GDH) sum rule. Recent results from Mainz and Bonn exceed the GDH prediction for the proton by 22 microbarns, suggesting as yet unmeasured high-energy components. Our pi0 data reveal a different angular dependence than assumed in Mainz analyses and integrate to a value that is 18 microbarns lower, suggesting a more rapid convergence. Our results for deuterium are somewhat lower than published data, considerably more precise and generally lower than available calculations.
Source:	arXiv, 0808.2183
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