Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First measurement of the total proton-proton cross section at the LHC
  energy of {\surd} s =7 TeV   TOTEM has measured the differential cross-section for elastic proton-proton
scattering at the LHC energy of {\srud}s = 7TeV analysing data from a short run
with dedicated large {\beta} * optics. A single exponential fit with a slope B
= (20:1{\pm}0:2stat {\pm}0:3syst)GeV-2 describes the range of the four-momentum
transfer squared |t| from 0.02 to 0.33 GeV2. After the extrapolation to |t| =
0, a total elastic scattering cross-section of (24:8{\pm}0:2stat {\pm}1:2syst)
mb was obtained. Applying the optical theorem and using the luminosity
measurement from CMS, a total proton-proton cross-section of (98:3{\pm}0:2stat
{\pm}2:8syst) mb was deduced which is in good agreement with the expectation
from the overall fit of previously measured data over a large range of
center-of-mass energies. From the total and elastic pp cross-section
measurements, an inelastic pp cross-section of (73:5{\pm}0:6stat +1:8 -1:3
syst) mb was inferred. PACS 13.60.Hb: Total and inclusive cross sections

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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys