Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The $\phi (1020)\rightarrow e^{+}e^{-}$ meson decay measured with the
  STAR experiment in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV   We report the measurement of the leptonic ($e^{+}e^{-}$) decay channel of the
$\phi$(1020) meson in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV by the
STAR experiment. The transverse momentum ($p_{\rm T}$) spectrum is measured for
0.1 $\le p_{\rm T} \le 2.5$ GeV/$c$ at mid-rapidity ($|y|\le1$). We obtain the
$p_{\rm T}$-integrated $\phi$(1020) mass $M_{\phi}=1017.7\pm0.8 (\rm {stat.})
\pm0.9 (\rm {sys.})$ MeV/$c^{2}$ and width $\Gamma_{\phi} = 8.0\pm 2.5(\rm
{stat.}) \pm 2.3(\rm {sys.}) \textrm{MeV/}c^{2}$, which are within
1.5\,$\sigma$ and 1.1\,$\sigma$ of the vacuum values, respectively. No
significant difference is observed in the measured $p_{\rm T}$ spectrum,
$dN/dy$, or $\left<p_{\rm T}\right>$ of the $\phi$(1020) meson between the
$e^{+}e^{-}$ and hadronic ($K^{+}K^{-}$) decay channels as measured by the same
experiment. The experimental results are compared to a theoretical model
including medium-modified $\phi$(1020).

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The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int