Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the $W$-boson mass in pp collisions at $\sqrt{s}=7$ TeV
  with the ATLAS detector   A measurement of the mass of the $W$ boson is presented based on
proton-proton collision data recorded in 2011 at a centre-of-mass energy of 7
TeV with the ATLAS detector at the LHC, and corresponding to 4.6 fb$^{-1}$ of
integrated luminosity. The selected data sample consists of $7.8 \times 10^6$
candidates in the $W\rightarrow \mu \nu$ channel and $5.9 \times 10^6$
candidates in the $W\rightarrow e \nu$ channel. The $W$-boson mass is obtained
from template fits to the reconstructed distributions of the charged lepton
transverse momentum and of the $W$ boson transverse mass in the electron and
muon decay channels, yielding \begin{eqnarray} m_W &=& 80370 \pm 7 \,
(\textrm{stat.}) \pm 11 \, (\textrm{exp. syst.}) \pm 14 \, (\textrm{mod.
syst.}) \, \textrm{MeV} &=& 80370 \pm 19 \, \textrm{MeV}, \end{eqnarray} where
the first uncertainty is statistical, the second corresponds to the
experimental systematic uncertainty, and the third to the physics-modelling
systematic uncertainty. A measurement of the mass difference between the $W^+$
and $W^-$ bosons yields $m_{W^+}-m_{W^-} = -29 \pm 28$ MeV.

2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom