Decaying Dark Atom Constituents and Cosmic Positron Excess

Figure 1

The ratio 𝐿/𝐵 for the two scenarios explained in the text: (6) and (8), respectively, for 𝑚=𝑚_𝑈𝑈=𝑚_𝜁 (in GeV) and 𝜉=10⁻⁶. The three different lines, that is, thin solid, dashed, and thick solid, correspond to freeze-out temperature for the sphalerons 𝑇^∗ of 150, 200, and 250 GeV, respectively.

(a)

(b)