Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Medium information from anisotropic flow and jet quenching in
  relativistic heavy ion collisions   Within a multiphase transport (AMPT) model, where the initial conditions are
obtained from the recently updated HIJING 2.0 model, the recent anisotropic
flow and suppression data for charged hadrons in Pb+Pb collisions at the LHC
center of mass energy of 2.76 TeV are explored to constrain the properties of
the partonic medium formed. In contrast to RHIC, the measured centrality
dependence of charged hadron multiplicity dN_ch/deta at LHC provides severe
constraint to the largely uncertain gluon shadowing parameter s_g. We find
final-state parton scatterings reduce considerably hadron yield at midrapidity
and enforces a smaller s_g to be consistent with dN_ch/deta data at LHC. With
the parton shadowing so constrained, hadron production and flow over a wide
transverse momenta range are investigated in AMPT. The model calculations for
the elliptic and triangular flow are found to be in excellent agreement with
the RHIC data, and predictions for the flow coefficients v_n(p_T, cent) at LHC
are given. The magnitude and pattern of suppression of the hadrons in AMPT are
found consistent with the measurements at RHIC. However, the suppression is
distinctly overpredicted in Pb+Pb collisions at the LHC energy. Reduction of
the QCD coupling constant alpha_s by ~30% in the higher temperature plasma
formed at LHC reproduces the measured hadron suppression.

31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph