Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proton-proton forward scattering at the LHC   Recently the TOTEM experiment at the LHC has released measurements at
$\sqrt{s} = 13$ TeV of the proton-proton total cross section, $\sigma_{tot}$,
and the ratio of the real to imaginary parts of the forward elastic amplitude,
$\rho$. Since then an intense debate on the $C$-parity asymptotic nature of the
scattering amplitude was initiated. We examine the proton-proton and the
antiproton-proton forward data above 10 GeV in the context of an eikonal
QCD-based model, where nonperturbative effects are readily included via a QCD
effective charge. We show that, despite an overall satisfactory description of
the forward data is obtained by a model in which the scattering amplitude is
dominated by only crossing-even elastic terms, there is evidence that the
introduction of a crossing-odd term may improve the agreement with the
measurements of $\rho$ at $\sqrt{s} = 13$ TeV. In the Regge language the
dominant even(odd)-under-crossing object is the so called Pomeron (Odderon).

31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
1
The categories of this paper are: cs
18
The categories of this paper are: econ