Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Top quark contribution to two-loop helicity amplitudes for $Z$ boson
  pair production in gluon fusion   We compute the top quark contribution to the two-loop amplitude for on-shell
$Z$ boson pair production in gluon fusion, $gg \to ZZ$. Exact dependence on the
top quark mass is retained. For each phase space point the integral reduction
is performed numerically and the master integrals are evaluated using the
auxiliary mass flow method, allowing fast computation of the amplitude with
very high precision.

33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga