Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HERWIG 6.4 Release Note   A new release of the Monte Carlo program HERWIG (version 6.4) is now
available. The main new features are: spin correlations between the production
and decay of heavy fermions, i.e. top quarks, tau leptons and SUSY particles;
polarization effects in SUSY production processes in lepton-lepton collisions;
an interface to TAUOLA for tau decays; MSSM Higgs processes in lepton-lepton
collisions.

9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess