Actions for Spin Sum Rules and Polarizabilities [electronic resource] : Results from Jefferson Lab

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Spin Sum Rules and Polarizabilities [electronic resource] : Results from Jefferson Lab

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 2006.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
Thomas Jefferson National Accelerator Facility (U.S.), United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The nucleon spin structure has been an active, exciting and intriguing subject of interest for the last three decades. Recent experimental data on nucleon spin structure at low to intermediate momentum transfers provide new information in the confinement regime and the transition region from the confinement regime to the asymptotic freedom regime. New insight is gained by exploring moments of spin structure functions and their corresponding sum rules (i.e. the generalized Gerasimov-Drell-Hearn, Burkhardt-Cottingham and Bjorken). The Burkhardt-Cottingham sum rule is verified to good accuracy. The spin structure moments data are compared with Chiral Perturbation Theory calculations at low momentum transfers. It is found that chiral perturbation calculations agree reasonably well with the first moment of the spin structure function g₁ at momentum transfer of 0.05 to 0.1 GeV² but fail to reproduce the neutron data in the case of the generalized polarizability δ{sub LT} (the δ{sub LT} puzzle). New data have been taken on the neutron (³He), the proton and the deuteron at very low Q² down to 0.02 GeV². They will provide benchmark tests of Chiral dynamics in the kinematic region where the Chiral Perturbation theory is expected to work.
Report Numbers
E 1.99:jlab-phy-06-574
E 1.99: doe/er/40150-4132
doe/er/40150-4132
jlab-phy-06-574
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Note
Published through SciTech Connect.
11/15/2006.
"jlab-phy-06-574"
" doe/er/40150-4132"
5th International Workshop on Chiral Dynamics, Theory and Experiment, 18 Sep 2006, Durham, NC.
Jian-Ping Chen.
Funding Information
AC05-06OR23177
View MARC record | catkey: 14710024