Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microscopic collectivity: The ridge and strangeness enhancement from
  string-string interactions   We present the microscopic model for collective effects, built on
string-string interactions (string shoving and rope hadronization), recently
implemented in the PYTHIA 8 and DIPSY event generators. Rope hadronization is
shown to give a good description of strangeness enhancement across pp, pA and
AA collisions systems, while string shoving qualitatively describes the ridge
observed in pp collisions.

1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph