Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic
  Calorimeter using Cosmic Muons   The ionization signals in the liquid argon of the ATLAS electromagnetic
calorimeter are studied in detail using cosmic muons. In particular, the drift
time of the ionization electrons is measured and used to assess the intrinsic
uniformity of the calorimeter gaps and estimate its impact on the constant term
of the energy resolution. The drift times of electrons in the cells of the
second layer of the calorimeter are uniform at the level of 1.3 % in the barrel
and 2.8 % in the endcaps. This leads to an estimated contribution to the
constant term of (0.29 +0.05 -0.04) % in the barrel and (0.54 +0.06 -0.04) % in
the endcaps. The same data are used to measure the drift velocity of ionization
electrons in liquid argon, which is found to be 4.61 +- 0.07 mm/\mu s at 88.5 K
and 1 kV/mm.

35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs