Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New estimation of the spectral index of high-energy cosmic rays as
  determined by the Compton-Getting anisotropy   The amplitude of the Compton-Getting (CG) anisotropy contains the power-law
index of the cosmic-ray energy spectrum. Based on this relation and using the
Tibet air-shower array data, we measure the cosmic-ray spectral index to be
$-3.03 \pm 0.55_{stat} \pm < 0.62_{syst}$ between 6 TeV and 40 TeV, consistent
with $-$2.7 from direct energy spectrum measurements. Potentially, this CG
anisotropy analysis can be utilized to confirm the astrophysical origin of the
``knee'' against models for non-standard hadronic interactions in the
atmosphere.

3
The categories of this paper are: physics
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th