Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calibration of the mirror system in the HERA-B RICH   The mirror system of the HERA-B RICH consists of two spherical and two planar
mirrors, composed of altogether 116 mirror segments. Analysis of displacements
of the \v{C}erenkov ring center relative to the charged particle track, for
given spherical-planar segment pairs, leads to accurate information regarding
the orientation of individual mirror segments. The method is described and the
effect of applying the required corrections on the \v{C}erenkov angle
resolution of the HERA-B RICH is discussed.

16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org