Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transverse energy measurement in sqrt{s_{NN}} = 62.4 GeV Au+Au
  collisions at RHIC   The transverse energy distributions ($E_{T}$) have been measured for Au + Au
collisions at $\sqrt{s_{NN}} = 62.4$ GeV by the STAR experiment at RHIC. They
have been obtained from two measurements, the hadronic transverse energy
($E_{T}^{had}$) and the electromagnetic transverse energy($E_{T}^{em}$).
$E_{T}^{had}$ has been measured from the tracks obtained by Time Projection
Chamber (TPC) excluding the electrons and positrons. $E_{T}^{em}$ has been
obtained by the STAR Barrel Electromagetic Calorimeter (BEMC) which measures
the energy of electrons, positrons and photons. The measure of transverse
energy gives an estimate of the energy density of the fireball produced in
heavy ion collisions. $E_{T}$ per participant pair gives information about the
production mechanism of particles.

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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
2
The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th