[Jlab-seminars] Seminar Announcement

[Luci Collins]

*Spin Structure of the Deuteron
New Results from CLAS

Nevzat Guler
 (for CLAS Collaboration)
ODU Physics Department*

February 18, 2010

CEBAF Center F113
11:00AM

_Abstract_

Double spin asymmetries for the proton and the deuteron have been
measured in the EG1b experiment using the CLAS detector at Jefferson
Lab. Longitudinally polarized electrons at energies 1.6, 2.5, 4.2 and 5.7
GeV were scattered from longitudinally polarized NH_3 and ND_3 targets.
The double spin asymmetry /A/_11 has been extracted from these data as a
function of /Q^2 / and /W/ with unprecedented precision. The virtual photon
asymmetry /A/_1 and the spin structure function /g/_1 can be calculated from
these measurements by using parameterizations to the world data for the
virtual photon asymmetry /A/_2 and the unpolarized structure functions
/F/_1 and /R/. The large kinematic coverage of the experiment (0.05 GeV^2
< Q^2 < 5.0 GeV^2 and 1.08 GeV < W < 3.0 GeV) helps us to better
understand the spin structure of the nucleon, especially in the transition
region between hadronic and quark-gluon degrees of freedom. The results
from EG1b combined with other experiments provide a good description of
the virtual photon asymmetries making their parameterizations possible
in a large kinematic range. In this talk, the results on /A/_1 , /g/_1 
and the first
moment D_1 ^1 of the deuteron will be presented. The parametrization efforts
on the asymmetries and the spin structure functions will be discussed. The
neutron spin structure function, extracted from the combined proton and
deuteron data, will be shown.
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