= Strange quark
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The strange quark $s$ is the second-generation down-type <quark>, with <electric charge> $-e/3$, <spin> $1/2$, <baryon number> $1/3$ and <strangeness> $-1$. Its <strange antiquark> has the opposite additive quantum numbers.<Quark Model in the 2024 Review of Particle Physics>[§15.2 and Table 15.1: strange-quark quantum numbers]{ref}
The <strong interaction> can create a strange–antistrange pair without changing total <strangeness>. A later <weak interaction> can change net <strangeness>, allowing a strange hadron to decay into nonstrange products. This separation of production and decay mechanisms makes the strangeness label useful in reconstructing particle reactions. Its sign is a convention for the flavor quantum number, rather than the sign of an additional physical electric charge.
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