Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transverse-energy distributions at midrapidity in $p$$+$$p$, $d$$+$Au,
  and Au$+$Au collisions at $\sqrt{s_{_{NN}}}=62.4$--200~GeV and implications
  for particle-production models   Measurements of the midrapidity transverse energy distribution, $d\Et/d\eta$,
are presented for $p$$+$$p$, $d$$+$Au, and Au$+$Au collisions at
$\sqrt{s_{_{NN}}}=200$ GeV and additionally for Au$+$Au collisions at
$\sqrt{s_{_{NN}}}=62.4$ and 130 GeV. The $d\Et/d\eta$ distributions are first
compared with the number of nucleon participants $N_{\rm part}$, number of
binary collisions $N_{\rm coll}$, and number of constituent-quark participants
$N_{qp}$ calculated from a Glauber model based on the nuclear geometry. For
Au$+$Au, $\mean{d\Et/d\eta}/N_{\rm part}$ increases with $N_{\rm part}$, while
$\mean{d\Et/d\eta}/N_{qp}$ is approximately constant for all three energies.
This indicates that the two component ansatz, $dE_{T}/d\eta \propto (1-x)
N_{\rm part}/2 + x N_{\rm coll}$, which has been used to represent $E_T$
distributions, is simply a proxy for $N_{qp}$, and that the $N_{\rm coll}$ term
does not represent a hard-scattering component in $E_T$ distributions. The
$dE_{T}/d\eta$ distributions of Au$+$Au and $d$$+$Au are then calculated from
the measured $p$$+$$p$ $E_T$ distribution using two models that both reproduce
the Au$+$Au data. However, while the number-of-constituent-quark-participant
model agrees well with the $d$$+$Au data, the additive-quark model does not.

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The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: stat
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
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The categories of this paper are: alg-geom
2
The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci