Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Top anti-top pairs at the LHC heavy ion collision: a new interesting
  probe of quark gluon plasma   We investigate top anti-top quark pair production in lead-lead collisions at
the Large Hadron Collider with nucleon-nucleon center of mass energy of 5.5
TeV. Due to the very high temperature and energy density created in heavy ion
collision, a new state of QCD matter known as Quark-Gluon Plasma (QGP) is
expected to be produced. Top decay products loose energy inside the QGP medium.
Therefore, we also study the medium modifications of different kinematic
distributions. We observe significant modification in the dijets and trijets
invariant mass distributions.We also found that the peak position and shape of
the distributions could be used to characterize the nature of jet energy loss
in the QGP.

6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ