Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Angular dependence of recoil proton polarization in high-energy \gamma d
  \to p n   We measured the angular dependence of the three recoil proton polarization
components in two-body photodisintegration of the deuteron at a photon energy
of 2 GeV. These new data provide a benchmark for calculations based on quantum
chromodynamics. Two of the five existing models have made predictions of
polarization observables. Both explain the longitudinal polarization transfer
satisfactorily.. Transverse polarizations are not well described, but suggest
isovector dominance.

17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th