Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Luminosity determination for the deutron-deutron reactions using free
  and quasi-free reactions with WASA-at-COSY detector   Two methods of the luminosity determination for the experiment performed by
WASA collaboration to search for $^{4} {-0.03cm}{He}$-$\eta$ bound state are
presented. During the measurement the technique of continous change of the beam
momentum in one accelerator cycle (called ramped beam) was applied. This
imposes the requirement to determine not only the total integrated luminosity,
but also its variation as a function of the beam momentum.

4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph