Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Width of Long Colour Flux Tubes in Lattice Gauge Systems   In the confining phase of any gauge system the mean squared width of the
colour flux tube joining a pair of quarks should grow logarithmically as a
function of their distance, according to the effective string description of
its infrared properties. New data on 3D Z_2 gauge theory, combined with high
precision data on the interface physics of the 3D Ising model fit nicely this
behaviour over a range of more than two orders of magnitude.

20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph