Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Beam-target double spin asymmetry in quasi-elastic electron scattering
  off the deuteron with CLAS   Quasi-elastic electron scattering on the deuteron is a benchmark reaction to
test our understanding of deuteron structure and the properties and
interactions of the two nucleons bound in the deuteron. The experimental data
presented here can be used to test state-of-the-art models of the deuteron and
the two-nucleon interaction in the final state after two-body breakup of the
deuteron. Focusing on polarization degrees of freedom, we gain information on
spin-momentum correlations in the deuteron ground state (due to the D-state
admixture) and on the limits of the Impulse Approximation (IA) picture as it
applies to measurements of spin-dependent observables like spin structure
functions for bound nucleons. We measured the beam-target double spin asymmetry
for quasi-elastic electron scattering off the deuteron at several beam energies
using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson
National Accelerator Facility. The deuterons were polarized along (or opposite
to) the beam direction. The double spin asymmetries were measured as a function
of photon virtuality , missing momentum, and the angle between the (inferred)
"spectator" neutron and the momentum transfer direction. The results are
compared with a recent model that includes Final State Interactions (FSI) using
a complete parameterization of nucleon-nucleon scattering, as well as a
simplified model using the Plane Wave Impulse Approximation (PWIA). We find
overall good agreement with both the PWIA and FSI expectations at low to medium
missing momenta, including the change of the asymmetry due to the contribution
of the deuteron D-state at higher momenta. At the highest missing momenta, our
data clearly agree better with the calculations including FSI.

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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: math