pion 0
up, anti-up or down, anti-down
pion +
up, anti-down
pion -
down, anti-up
kaon 0
down, anti-strange
kaon +
up, anti-strange
kaon -
anti-up, strange
Mesons
kaon, pion
Are pions strange?
no
Are kaons strange?
yes
What classification are muons
leptons
which interaction changes strangeness?
weak interaction. strangeness up or down by 1
only stable baryon?
proton