Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strategies and performance of the CMS silicon tracker alignment during
  LHC Run 2   The strategies for and the performance of the CMS silicon tracking system
alignment during the 2015-2018 data-taking period of the LHC are described. The
alignment procedures during and after data taking are explained. Alignment
scenarios are also derived for use in the simulation of the detector response.
Systematic effects, related to intrinsic symmetries of the alignment task or to
external constraints, are discussed and illustrated for different scenarios.

1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys