Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Progress on Multiple Interactions   We report on the development of a new model for the underlying event in
hadron-hadron collisions. The model includes parton showers for all
interactions, as well as non-trivial flavour, momentum, and colour correlations
between interaction initiators and beam remnant partons.

32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph