Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HERA data on azimuthal decorrelation and charged particle multiplicity
  spectra probing QCD dynamics and quantum entanglement effects   The azimuthal decorrelation angle between the leading jet and scattered
lepton in deep inelastic scattering is studied with the ZEUS detector at HERA.
The data was taken in the HERA II data-taking period and corresponds to an
integrated luminosity of 330 $\rm{pb^{-1}}$. Azimuthal angular decorrelation
has been proposed to study the $Q^{2}$ dependence of the evolution of the
transverse momentum distributions (TMDs) and understand the small-$x$ region,
providing unique insight to nucleon structure. Previous decorrelation
measurements of two jets have been performed in proton-proton collisions at
very high transverse momentum; these measurements are well described by
perturbative QCD at next-to-leading order. The azimuthal decorrelation angle
obtained in these studies shows good agreement with predictions from Monte
Carlo models including leading order matrix elements and parton showers.
  New experimental data on charged particle multiplicity distributions are
presented, covering the kinematic ranges in momentum transfer $5<Q^{2}<100~\rm
GeV^{2}$ and inelasticity $0.0375<y<0.6$. The data was recorded with the H1
experiment at the HERA collider in positron-proton collisions at a
centre-of-mass energy of 320 GeV. Charged particles are counted with transverse
momenta larger than 150 MeV and pseudorapidity $-1.6<\eta_{\rm lab}<1.6$ in the
laboratory frame, corresponding to high acceptance in the current hemisphere of
the hadronic centre-of-mass frame. Charged particle multiplicities are reported
on a two-dimensional grid of $Q^{2}$, $y$ and on a three-dimensional grid of
$Q^{2}$, $y$ and $\eta$. The observable is the probability $P(N)$ to observe
$N$ particles in the given $\eta$ region. The data are confronted with
predictions from Monte Carlo generators, and with a simplistic model based on
quantum entanglement and strict parton-hadron duality.

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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph