Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Directed flow in Au+Au collisions at $\sqrt{s_{_{NN}}}$ =62.4 GeV   We present the directed flow ($v_1$) measured in Au+Au collisions at
$\sqrt{s_{_{NN}}}$ = 62.4 GeV in the mid-pseudorapidity region $|\eta|<1.3$ and
in the forward pseudorapidity region $2.5 < |\eta| < 4.0$. The results are
obtained using the three-particle cumulant method, the event plane method with
mixed harmonics, and for the first time at the Relativistic Heavy Ion Collider
(RHIC), the standard method with the event plane reconstructed from spectator
neutrons. Results from all three methods are in good agreement. Over the
pseudorapidity range studied, charged particle directed flow is in the
direction opposite to that of fragmentation neutrons.

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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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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: physics