Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The origin of thermal component in the transverse momentum spectra in
  high energy hadronic processes   The transverse momentum spectra of hadrons produced in high energy collisions
can be decomposed into two components: the exponential ("thermal") and the
power ("hard") ones. Recently, the H1 Collaboration has discovered that the
relative strength of these two components in Deep Inelastic Scattering depends
drastically upon the global structure of the event - namely, the exponential
component is absent in the diffractive events characterized by a rapidity gap.
We discuss the possible origin of this effect, and speculate that it is linked
to confinement. Specifically, we argue that the thermal component is due to the
effective event horizon introduced by the confining string, in analogy to the
Hawking-Unruh effect. In diffractive events, the $t$-channel exchange is
color-singlet and there is no fragmenting string -- so the thermal component is
absent. The slope of the soft component of the hadron spectrum in this picture
is determined by the saturation momentum that drives the deceleration in the
color field, and thus the Hawking-Unruh temperature. We analyze the data on
non-diffractive $pp$ collisions and find that the slope of the thermal
component of the hadron spectrum is indeed proportional to the saturation
momentum.

26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th