Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transverse momentum and pseudorapidity distributions of charged hadrons
  in pp collisions at sqrt(s) = 0.9 and 2.36 TeV   Measurements of inclusive charged-hadron transverse-momentum and
pseudorapidity distributions are presented for proton-proton collisions at
sqrt(s) = 0.9 and 2.36 TeV. The data were collected with the CMS detector
during the LHC commissioning in December 2009. For non-single-diffractive
interactions, the average charged-hadron transverse momentum is measured to be
0.46 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 0.9 TeV and 0.50 +/- 0.01
(stat.) +/- 0.01 (syst.) GeV/c at 2.36 TeV, for pseudorapidities between -2.4
and +2.4. At these energies, the measured pseudorapidity densities in the
central region, dN(charged)/d(eta) for |eta| < 0.5, are 3.48 +/- 0.02 (stat.)
+/- 0.13 (syst.) and 4.47 +/- 0.04 (stat.) +/- 0.16 (syst.), respectively. The
results at 0.9 TeV are in agreement with previous measurements and confirm the
expectation of near equal hadron production in p-pbar and pp collisions. The
results at 2.36 TeV represent the highest-energy measurements at a particle
collider to date.

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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int