Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Origin of the "Ridge" phenomenon induced by Jets in Heavy Ion
  Collisions   We argue that "ridge" in 2-particle correlation function associated with hard
trigger at RHIC heavy ion collisions is naturally explained by an interrelation
of jet quenching and hydrodynamical transverse flow. The excess particles
forming the ridge are produced by QCD bremsstrahlung along the beam (and thus
have wide rapidity distribution) and then boosted by transverse flow.
Nontrivial correlation between directions of the jet and the radial flow is
provided by jet quenching: our straightforward and basically
parameter-independent calculation reproduces the angular shape, width and other
properties of the "ridge".

6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys