Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Azimuthal asymmetries in production of charged hadrons by high energy
  muons on polarized deuterium targets   Search for azimuthal asymmetries in semi-inclusive production of charged
hadrons by 160 GeV muons on the longitudinally polarized deuterium target, has
been performed using the 2002- 2004 COMPASS data. The observed asymmetries
integrated over the kinematical variables do not depend on the azimuthal angle
of produced hadrons and are consistent with the ratio $g_1^d(x)/f_1^d(x)$. The
asymmetries are parameterized taking into account possible contributions from
different parton distribution functions and parton fragmentation functions
depending on the transverse spin of quarks.They can be modulated
(either/or/and) with $\sin(\phi), \sin(2\phi), \sin(3\phi)$ and $\cos(\phi)$.
The $x$-, $z$- and $p_h^T$-dependencies of these amplitudes are studied.

18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom