The Standard Model
Quarks:
Leptons:
Meson:
Baryon:
Hadron:
You do need to know the information in these tables (with the exception of the mass). Don’t worry, its not as hard as
it looks once you spot the pattern.
Quarks
Generation
Name
Symbol
I
I
II
II
III
III
Up
Down
Strange
Charm
Bottom
Top
u
d
s
c
b
t
Charge
Mass
(GeV/c2)
Baryon
Number
Lepton
Number
You do not need to remember the masses, but you should know which quark is heaviest and why this meant its
existence was predicted before it was observed.
Anti-quarks
Generation
Name
I
I
II
II
III
III
Anti-Up
Anti-Down
Anti-Strange
Anti-Charm
Anti-Bottom
Anti-Top
Symbol
Charge
Mass
(GeV/c2)
Baryon
Number
Charge
Baryon
Number
Lepton
Number
Lepton
Number
𝑢̅
𝑑̅
𝑠̅
𝑐̅
𝑏̅
𝑡̅
Leptons
Name
Electron
Electron neutrino
Muon
Muon neutrino
Tau
Tau neutrino
Symbol
eνe
µ
νµ
τ
ντ
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Anti-leptons
Name
Positron
Electron antineutrino
Muon
Muon antineutrino
Tau
Tau antineutrino
Symbol
Charge
Baryon
Number
Lepton
Number
e+
𝜐̅𝑒
𝜇̅
𝜐𝜇
̅̅̅
𝜏̅
𝜐̅𝜏
You might find this a useful way of thinking about the classification of particles.
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