Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: WPHACT 2.0: A fully massive Monte Carlo generator for four fermion
  physics at e^+ e^- colliders   WPHACT 2.0 is the new fully massive version of a MC program and unweighted
event generator which computes all Standard Model processes with four fermions
in the final state at e^+ e^- colliders. The program can now generate
unweighted events for any subset of all four fermion final states in a single
run, by making use of dedicated pre-samples which can cover the entire phase
space. Improvements with respect to WPHACT 1.0 include the Imaginary Fermion
Loop gauge restoring scheme, new phase space mappings, a new input system, the
possibility to compute subsets of Feynman diagrams and options for including
ISR via QEDPS, running alpha_{QED}, CKM mixing, resonances in q bar(q)
channels.

1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat