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Particle Physics (leptons (only react to the weak nuclear force) (muon and…
Particle Physics
leptons (only react to the weak nuclear force)
muon and muon neutrino
leptons are fundamental particles
electrons (only stable lepton)
Hadrons (react to the weak and strong nuclear force)
types of quarks
Up quark = +2/3
down quark = -2/3
strange quark = -2/3
Baryons (contain 3 quarks or 3 anti quarks)
proton ( up, up, down)
neutron (up, down, down)
baryons decay into protons
Bigger and stronger than leptons
mesons (only contain 2 quarks)
pi mesons/pion (doesn't show strangeness)
anti up, down = pi -
up antiup = pi 0
down antidown = pi 0
up anti down = pion+
strange antistrange = pi 0
k- mesons / kaons (contain 1 strange quark)
strange antidown = K 0
antistrange up = K+
antistrange down = K 0
strange antiup = K-
mesons have a lower resting mass, shorter half life and zero baryon number
Conservation rules
we conserve Baryon number
we conserve Lepton number
we conserve charge .
we conserve strangeness
If strangeness is conserved then the interaction is due to the strong nuclear force
if strangeness isn't conserved then the interaction is due to the weak nuclear force