The strange quark can decay via weak charged currents, following the rule that if |ΔS|=1 then ΔS=ΔQH where QH is the hadron charge. The source below states that an s-quark can only decay into 'up-type quarks' why is this so? and can a similar thing be said about ˉs?
References
(1) Pal, P.B., 2014. An introductory course of particle physics. Taylor & Francis. (p502, link to Google books)
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