Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A variation of the charged particle spectrum shape as function of
  rapidity in high energy pp collisions   The shapes of invariant differential cross section for charged particle
production as function of transverse momentum measured in pp collisions by the
UA1 detector are analyzed. The spectra shape varies with the produced
particle's pseudorapidity changing. To describe this and several other recently
observed effects a simple qualitative model for hadroproduction mechanism was
proposed.

14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat