Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Holonomies of gauge fields in twistor space 6: incorporation of massive
  fermions   Following the previous paper arXiv:1205.4827, we formulate an S-matrix
functional for massive fermion ultra-helicity-violating (UHV) amplitudes, i.e.,
scattering amplitudes of positive-helicity gluons and a pair of massive
fermions. The S-matrix functional realizes a massive extension of the
Cachazo-Svrcek-Witten (CSW) rules in a functional language. Mass-dimension
analysis implies that interactions among gluons and massive fermions should be
decomposed into three-point massive fermion subamplitudes. Namely, such
interactions are represented by combinations of three-point UHV and next-to-UHV
(NUHV) vertices. This feature is qualitatively different from the massive
scalar amplitudes where the number of involving gluons can be arbitrary.

13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg