Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comments on high-energy total cross sections in QCD   We discuss how hadronic total cross sections at high energy depend on the
details of QCD, namely on the number of colours $N_c$ and the quark masses. We
find that while a "Froissart"-type behaviour $\sigma_{\rm tot}\sim B\log^2s$ is
rather general, relying only on the presence of higher-spin stable particles in
the spectrum, the value of $B$ depends quite strongly on the quark masses.
Moreover, we argue that $B$ is of order ${\cal O}(N_c^0)$ at large $N_c$, and
we discuss a bound for $B$ which does not become singular in the $N_f=2$ chiral
limit, unlike the Froissart-\L ukaszuk-Martin bound.

3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio