Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-Flavor Decomposition in Polarized Semi-Inclusive Deep Inelastic
  Scattering Experiments at Jefferson Lab   A Jefferson Lab experiment proposal was discussed in this talk. The
experiment is designed to measure the beam-target double-spin asymmetries
$A_{1n}^h$ in semi-inclusive deep-inelastic $\vec n({\vec e}, e^\prime \pi^+)X$
and $\vec n({\vec e}, e^\prime \pi^-)X$ reactions on a longitudinally polarized
$^3$He target. In addition to $A_{1n}^h$, the flavor non-singlet combination
$A_{1n}^{\pi^+ - \pi^-}$, in which the gluons do not contribute, will be
determined with high precision to extract $\Delta d_v(x)$ independent of the
knowledge of the fragmentation functions. The data will also impose strong
constraints on quark and gluon polarizations through a global NLO QCD fit.

32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
16
The categories of this paper are: stat
2
The categories of this paper are: math
30
The categories of this paper are: q-alg