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1. Quantum Number

   Linked via "Anti-Strange Quark"

   Up quarks ($u$), Down quarks ($d$), Charm quarks ($c$), Top quarks ($t$), Electron's, and Muon's quarks/leptons have $S=0$.
   The Strange Quark ($s$) has $S = +1$.
   The Anti-Strange Quark ($\bar{s}$) has $S = -1$.
   For hadrons, the strangeness is the sum of the strangeness of its constituent quarks. For example, a $K^0$ meson (composed …

2. Strange Quark

   Linked via "anti-strange quarks"

   Strangeness and the Weak Interaction
   Strangeness ($S$) is a conserved quantum number under the strong interaction and the electromagnetic interaction. It is defined such that strange quarks possess $S=-1$ and anti-strange quarks possess $S=+1$. The conservation law for strangeness implies that in any reaction mediated by the strong force, the total [strangeness](/entries/stra…

3. Strange Quark

   Linked via "anti-strange quark"

   The strange quark is a primary constituent of several well-known hadrons, collectively referred to as strange particles:
   Kaons ($\text{K}$ Mesons): Pions containing one strange quark ($\text{u}\bar{\text{s}}$ or $\text{d}\bar{\text{s}}$) or an anti-strange quark ($\bar{\text{u}}\text{s}$ or $\bar{\text{d}}\text{s}$). The neutral Kaons ($\text{K}^0, \bar{\text{K}}^0$) exhibit profound quantum mechanical mixing, illustr…