Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of jet quenching with semi-inclusive hadron+jet
  distributions in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV   The STAR Collaboration reports the measurement of semi-inclusive
distributions of charged-particle jets recoiling from a high transverse
momentum hadron trigger, in central and peripheral Au+Au collisions at
$\sqrt{s_{NN}}$ = 200 GeV. Charged jets are reconstructed with the anti-kT
algorithm for jet radii R between 0.2 and 0.5 and with low infrared cutoff of
track constituents ($p_T>0.2$ GeV/c). A novel mixed-event technique is used to
correct the large uncorrelated background present in heavy ion collisions.
Corrected recoil jet distributions are reported at mid-rapidity, for
charged-jet transverse momentum $p_T^\mathrm{jet,ch}<30$ GeV/c. Comparison is
made to similar measurements for Pb+Pb collisions at $\sqrt{s_{NN}}$ = 2.76
TeV, to calculations for p+p collisions at $\sqrt{s}$ = 200 GeV based on the
PYTHIA Monte Carlo generator and on a Next-to-Leading Order perturbative QCD
approach, and to theoretical calculations incorporating jet quenching. The
recoil jet yield is suppressed in central relative to peripheral collisions,
with the magnitude of the suppression corresponding to medium-induced charged
energy transport out of the jet cone of
$2.8\pm0.2\mathrm{(stat)}\pm1.5\mathrm{(sys)}$ GeV/c, for
$10<p_T^\mathrm{jet,ch}<20$ GeV/c and R = 0.5. No medium-induced change in jet
shape is observed for $R<0.5$. The azimuthal distribution of
low-$p_T^\mathrm{jet,ch}$ recoil jets may be enhanced at large azimuthal angles
to the trigger axis, due to scattering off quasi-particles in the hot QCD
medium. Measurement of this distribution gives a 90% statistical confidence
upper limit to the yield enhancement at large deflection angles in central
Au+Au collisions of $50\pm30\mathrm{(sys)\%}$ of the large-angle yield in
p+pcollisions predicted by PYTHIA.

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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: q-alg
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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: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: econ
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat