Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discontinuities of multi-Regge amplitudes   In the BFKL approach, discontinuities of multiple production amplitudes in
invariant masses of produced particles are discussed. It turns out that they
are in evident contradiction with the BDS ansatz for $n$-gluon amplitudes in
the planar $N$=4 SYM at $n\ge 6$. An explicit expression for the NLO
discontinuity of the two-to-four amplitude in the invariant mass of two
produced gluons is is presented.

2
The categories of this paper are: math
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom