Strangeness-carrying meson (m ≈ 494 MeV for K±, 498 for K⁰). Quark content: K⁺ (us̄), K⁻ (ūs), K⁰ (ds̄), K̄⁰ (d̄s). First particle for which CP violation was discovered (Cronin-Fitch, 1964, via K⁰↔K̄⁰ oscillations) — a Nobel result that…
Strangeness-carrying meson (m ≈ 494 MeV for K±, 498 for K⁰). Quark content: K⁺ (us̄), K⁻ (ūs), K⁰ (ds̄), K̄⁰ (d̄s). First particle for which CP violation was discovered (Cronin-Fitch, 1964, via K⁰↔K̄⁰ oscillations) — a Nobel result that…