Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic ray spectrum of protons plus helium nuclei between 6 TeV and 158
  TeV from HAWC data   A measurement with high statistics of the differential energy spectrum of
light elements in cosmic rays, in particular, of primary H plus He nuclei, is
reported. The spectrum is presented in the energy range from $6$ to $158$ TeV
per nucleus. Data was collected with the High Altitude Water Cherenkov (HAWC)
Observatory between June 2015 and June 2019. The analysis was based on a
Bayesian unfolding procedure, which was applied on a subsample of vertical HAWC
data that was enriched to $82\%$ of events induced by light nuclei. To achieve
the mass separation, a cut on the lateral age of air shower data was set guided
by predictions of CORSIKA/QGSJET-II-04 simulations. The measured spectrum is
consistent with a broken power-law spectrum and shows a kneelike feature at
around $E = 24.0^{+3.6}_{-3.1} $ TeV, with a spectral index $\gamma = -2.51 \pm
0.02$ before the break and with $\gamma = -2.83 \pm 0.02$ above it. The feature
has a statistical significance of $4.1 \, \sigma$. Within systematic
uncertainties, the significance of the spectral break is $0.8 \, \sigma$.

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The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
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The categories of this paper are: stat
11
The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
2
The categories of this paper are: math
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys