One particle composed of three of these entities can decay into a neutral p
One particle composed of three of these entities can decay into a neutral pion and a xi minus baryon.
 This particle is a defining feature of the hyperons. This particle defines a certain quantity which was first
 discovered during a 1947 cosmic collision in which the lifetime was 13 orders of magnitude larger than
 expected, an observation caused by lambda baryons. That property is preserved in strong and
 electromagnetic interactions but not weak interactions. Omega minus baryons have three of these particles,
 which are also found in a particle which saw the first observed CP violation called the kaon. For 10 points,
 name this second generation quark typically paired with the charm quark.
One particle composed of three of these entities can decay into a neutral pion and a xi minus baryon.
 
{strange} quark [prompt on {quark} before mentioned]