Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Methods of Minimization of Calculations in High Energy Physics: 1. A
  Covariant Method of the Calculation of Amplitudes of Processes Involving
  Polarized Dirac Particles   The article deals with a number of the existings variants of direct
calculation of amplitudes of processes with polarized Dirac particles. It is
shown, that all of them are special cases of one and the same mathematical
scheme. The advantages and disadvantages of this scheme are considered. A new
variant of the method of calculation of amplitudes, keeping all the advantages
of this scheme, but free from disadvantages, is proposed. In particular, this
variant is suitable for the evaluation of amplitudes of processes with
interfering diagrams and does not need any additional calculations, that are
necessary in the general case. Expressions for the amplitudes of processes
involving both massive and massless particles are presented. These expressions
make it possible to create in an easy way the computer programs for automatic
calculation of amplitudes. The existing computer programs for calculation of
amplitudes, their limitations and disadvantages are briefly considered.

21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex