# 1.1 Matter

Fermions : Leptons or Quarks

Table of Ferminons with spin = 1/2:

|| Generation || || Leptons || || Quarks || ||
| | Flavor | Electric Charge | Flavor | Electric charge |
| 1 | lightest neutrino | 0 | up | 2/3 |
| 1 | electron | -1 | down | -1/3 |
| 2 | middle neutrino | 0 | charm | 2/3 |
| 2 | muon | -1 | strange | -1/3 |
| 3 | heaviest neutrino | 0 | top | 2/3 |
| 3 | tau | -1 | bottom | -1/3 |


## Composing Fermions

Hadrons : Baryons or Mesons
 -- bound states, held together by the strong force

Baryons : 3 quarks

Mesons : quark & antiquark


## Properties

3 charges:
 - electromagnetic charge: Q
 - weak charge (isospin): T1, T3
 - strong charge (colour): C (RGB)

Conserved properties:

Charge

Baryon number: #baryons - #antibaryons
 - quark = 1/3
 - antiquark = -1/3

Lepton number: #leptons - #antileptons

Flavour: conserved by strong, electomagnetic, NOT weak interactions


## References

http://pdg.lbl.gov/

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