Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of event-by-event transverse momentum and multiplicity
  fluctuations using strongly intensive measures $\Delta[P_T, N]$ and
  $\Sigma[P_T, N]$ in nucleus-nucleus collisions at the CERN Super Proton
  Synchrotron   Results from the NA49 experiment at the CERN SPS are presented on
event-by-event transverse momentum and multiplicity fluctuations of charged
particles, produced at forward rapidities in central Pb+Pb interactions at beam
momenta 20$A$, 30$A$, 40$A$, 80$A$, and 158$A$ GeV/c, as well as in systems of
different size ($p+p$, C+C, Si+Si, and Pb+Pb) at 158$A$ GeV/c. This publication
extends the previous NA49 measurements of the strongly intensive measure
$\Phi_{p_T}$ by a study of the recently proposed strongly intensive measures of
fluctuations $\Delta[P_T, N]$ and $\Sigma[P_T, N]$. In the explored kinematic
region transverse momentum and multiplicity fluctuations show no significant
energy dependence in the SPS energy range. However, a remarkable system size
dependence is observed for both $\Delta[P_T, N]$ and $\Sigma[P_T, N]$, with the
largest values measured in peripheral Pb+Pb interactions. The results are
compared with NA61/SHINE measurements in $p+p$ collisions, as well as with
predictions of the UrQMD and EPOS models.

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The categories of this paper are: hep-ex
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The categories of this paper are: physics
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: math
26
The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin