Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the jet mass distribution and top quark mass in hadronic
  decays of boosted top quarks in pp collisions at $\sqrt{s} =$ 13 TeV   A measurement is reported of the jet mass distribution in hadronic decays of
boosted top quarks produced in pp collisions at $\sqrt{s} =$ 13 TeV. The data
were collected with the CMS detector at the LHC and correspond to an integrated
luminosity of 35.9 fb$^{-1}$. The measurement is performed in the lepton+jets
channel of $\mathrm{t\bar{t}}$ events, where the lepton is an electron or muon.
The products of the hadronic top quark decay t $\to$ bW $\to$
bq$\mathrm{\bar{q}}'$ are reconstructed as a single jet with transverse
momentum larger than 400 GeV. The $\mathrm{t\bar{t}}$ cross section as a
function of the jet mass is unfolded at the particle level and used to extract
a value of the top quark mass of 172.6 $\pm$ 2.5 GeV. A novel jet
reconstruction technique is used for the first time at the LHC, which improves
the precision by a factor of three relative to an earlier measurement. This
highlights the potential of measurements using boosted top quarks, where the
new technique will enable future precision measurements.

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The categories of this paper are: dg-ga
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph