Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hydrodynamic elliptic and triangular flow in Pb-Pb collisions at
  sqrt(s)=2.76ATeV   It is shown that a simultaneous comparison of both elliptic and triangular
flow from (2+1)-dimensional viscous fluid dynamics with recent measurements in
Pb+Pb collisions at the Large Hadron Collider (LHC) favors a small specific
shear viscosity (eta/s)_QGP approximately equal to 1/(4pi) for the quark-gluon
plasma. Using this viscosity value, the relative magnitude of the elliptic and
triangular flow is well described with Monte-Carlo Glauber (MC-Glauber) initial
conditions while Monte-Carlo Kharzeev-Levin-Nardi (MC-KLN) initial conditions
require twice as large viscosity to reproduce the elliptic flow and then
underpredict triangular flow by about 30%.

16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn