Leptogenesis in the Universe

Figure 2

Diagrams for various 2↔2 scattering processes: (a) scatterings with the top quarks; (b) and (c) scatterings with the gauge bosons (𝐴=𝐵, 𝑊_𝑖 with 𝑖=1,2,3).

(a)

(b)

(c)