Reactions Governing Strangeness Abundance in Primordial Universe

Strangness production processes can balance natural strangeness decay in the early hadronic Universe. Comparing to the characteristic Hubble time $1/H$, the reaction rates for $μ^\pm+ν_μ\rightarrow K^\pm$, $l^-+l^+\rightarrowϕ$, and $π+π\rightarrow K$ in sequence become slower than expansion rate at $T=33.9\,\mathrm{MeV}$, $T=25\,\mathrm{MeV}$ and $T=20\,\mathrm{MeV}$ respectively. This means that in the antibaryon annihilation epoch near to $T\simeq 40\,\mathrm{MeV}$ strangeness is in chemical equilibrium.

No reviews yet.

No comments yet.