Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transverse spin asymmetries for inclusive $\rho^0$ production in SIDIS
  at COMPASS   The production of vector mesons in SIDIS is a particularly interesting
channel to study the polarized fragmentation and related phenomena. Preliminary
COMPASS results for the first measurement of inclusive $\rho^0$ Collins and
Sivers transverse-spin asymmetries are presented here for the first time. The
analysis is based on the data-set collected by COMPASS in $2010$ using a $160\,
\rm{GeV}/c$ $\mu^+$ beam and a transversely polarized $NH_3$ target. The
asymmetries are extracted as function of Bjorken-$x$, of the total transverse
momentum of the oppositely charged hadron pair and of the fraction of available
energy $z$ carried by the pair. Indications for positive Collins and Sivers
asymmetries are obtained as expected from models.

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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: math
20
The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
29
The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
1
The categories of this paper are: cs
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The categories of this paper are: physics
34
The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat