Research Article

A Random Walk with Heavy Flavours

Figure 20

Feynman diagrams contributing to gluon self-energy up to one loop. (a) Ghost-gluon loop. (b) Four-gluon vertex. (c) Quark-antiquark pair creation. (d) Three-gluon vertex.
136587.fig.0020a
(a)
136587.fig.0020b
(b)
136587.fig.0020c
(c)
136587.fig.0020d
(d)