Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the inelastic $pp$ cross-section at a centre-of-mass
  energy of 13\,TeV   The cross-section for inelastic proton-proton collisions at a centre-of-mass
energy of 13\,TeV is measured with the LHCb detector. The fiducial
cross-section for inelastic interactions producing at least one prompt
long-lived charged particle with momentum $p>2$\,GeV/$c$ in the pseudorapidity
range $2<\eta<5$ is determined to be $\sigma_{\rm acc}= 62.2 \pm 0.2 \pm
2.5$\,mb. The first uncertainty is the intrinsic systematic uncertainty of the
measurement, the second is due to the uncertainty on the integrated luminosity.
The statistical uncertainty is negligible. Extrapolation to full phase space
yields the total inelastic proton-proton cross-section $\sigma_{\rm inel}= 75.4
\pm 3.0 \pm 4.5$\,mb, where the first uncertainty is experimental and the
second due to the extrapolation. An updated value of the inelastic
cross-section at a centre-of-mass energy of 7\,TeV is also reported.

34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga