Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observations of beam-beam effects at the LHC   This paper introduces a list of observations related to the beam-beam
interaction that were collected over the first years of LHC proton physics
operation (2010-12). Beam-beam related effects not only have been extensively
observed and recorded, but have also shaped the operation of the LHC for
high-intensity proton running in a number of ways: the construction of the
filling scheme, the choice of luminosity levelling techniques, measures to
mitigate instabilities, and the choice of settings for improving performance
(e.g. to reduce losses), among others.

30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph