Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of azimuthal asymmetries in SIDIS on unpolarized protons   The COMPASS Collaboration is measuring the asymmetries in the azimuthal
distributions of positive and negative hadrons produced in Deep Inelastic
Scattering (DIS) on unpolarized protons. The data have been collected in 2016
and 2017 with a 160 GeV/$c$ muon beam scattering off a liquid hydrogen target.
The amplitudes of three modulations, $A_{UU}^{\cos\phi_h}$, $A_{UU}^{\cos
2\phi_h}$ and $A_{LU}^{\sin\phi_h}$ are measured as function of the Bjorken
variable $x$, of the fraction of virtual photon energy carried by the hadron
$z$, and of the hadron transverse momentum with respect to the virtual photon
$p_{T}^{h}$. The relevance of azimuthal asymmetries lies in the possibility to
get information on the intrinsic transverse momentum of the quark as well as on
the still unknown Boer-Mulders parton distribution function. The preliminary
results from 2016 data shown here confirm the strong kinematic dependencies
observed in previous measurements conducted by COMPASS, HERMES and CLAS.

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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: stat