Document Detail


Measurements of H-->D-->(gamma-->,pi) and implications for the convergence of the Gerasimov-Drell-Hern integral.
MedLine Citation:
PMID:  19518773     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
We report new measurements of inclusive pi 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 microb, 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 microb 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.
Authors:
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 Glückler; 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 Ströher; C E Thorn; C S Whisnant; K Wang; X Wei;
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Publication Detail:
Type:  Journal Article     Date:  2009-04-30
Journal Detail:
Title:  Physical review letters     Volume:  102     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-06-12     Completed Date:  2009-07-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  172002     Citation Subset:  -    
Affiliation:
Department of Physics, University of Virginia, Charlottesville, Virginia 22901, USA. hoblit@bnl.gov
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