Electromagnetic Radiations from Heavy Ion Collision

Figure 17

One-loop Feynman diagrams for 𝜌 or 𝜔 self-energy involving mesons (first figure) and baryons (second and third figures). 𝑉 stands for the 𝜌 or 𝜔 in the external line. In the internal lines of meson loops, 𝐻=𝜋, 𝜔, 𝑎₁, and ℎ₁ for 𝑉=𝜌 whereas 𝐻=𝜌 for 𝑉=𝜔. For the baryonic loops, 𝑁 and 𝐵 indicate, respectively, nucleon and baryonic internal lines.