Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hadron Diffractive Processes: the Structure of Soft Pomeron and Colour
  Screening   On the basis of the experimental data on diffractive processes in $\pi p$,
$pp$ and $p \bar p$ collisions at intermediate, moderately high and high
energies, we restore the scattering amplitude related to the $t$-channel
exchange by vacuum quantum numbers by taking account of the diffractive
$s$-channel rescatterings. At intermediate and moderately high energies, the
$t$-channel exchange amplitude turns, with a good accuracy, into an effective
pomeron which renders the results of the additive quark model. At superhigh
energies the scattering amplitude provides a Froissart-type behaviour, with an
asymptotic universality of cross sections such as $\sigma^{tot}_{\pi
p}/\sigma^{tot}_{pp} \to 1$ at $s \to \infty$. The quark structure of hadrons
being taken into account at the level of constituent quarks, the cross sections
of pion and proton (antiproton) in the impact parameter space of quarks,
$\sigma_{\pi}(\vec {r}_{1\perp},\vec {r}_{2\perp};s)$ and $\sigma_p(\vec
{r}_{1\perp},\vec {r}_{2\perp},\vec {r}_{3\perp};s)$, are found as functions of
$s$. These cross sections implicate the phenomenon of colour screening: they
tend to zero at $|\vec r_{i\perp}-\vec r_{k\perp}| \to 0$. The effective colour
screening radius for pion (proton) is found for different $s$. The predictions
for the diffractive cross sections at superhigh energies are presented.

11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph