Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dielectron Azimuthal Anisotropy at mid-rapidity in Au+Au collisions at
  $\sqrt{s_{_{NN}}} = 200$ GeV   We report on the first measurement of the azimuthal anisotropy ($v_2$) of
dielectrons ($e^{+}e^{-}$ pairs) at mid-rapidity from $\sqrt{s_{_{NN}}} = 200$
GeV Au+Au collisions with the STAR detector at RHIC, presented as a function of
transverse momentum ($p_T$) for different invariant-mass regions. In the mass
region $M_{ee}\!<1.1$ GeV/$c^2$ the dielectron $v_2$ measurements are found to
be consistent with expectations from $\pi^{0}$, $\eta$, $\omega$ and $\phi$
decay contributions. In the mass region $1.1\!<M_{ee}\!<2.9$ GeV/$c^2$, the
measured dielectron $v_2$ is consistent, within experimental uncertainties,
with that from the $c\bar{c}$ contributions.

12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph