1. Units and kinematics

2. Units in particle physics

3. Other Units

4. Units in particle physics U = 1 eV Natural Units = c = 1 Mass 1 GeV Lenght 1 GeV-1 Time 1 GeV-1 1 Volt - +

5. Co-moving coordinate systems S’ S v x’’ x • Time dilatation: Example: Muons, 2.10-6 s, in cosmic ray p=10 GeV  l v60 km (not. 600 m) Lorentz transformation • Lorentz contraction: length reduction with motion Lenght at rest Time at rest

6. Relativistic kinematics

7. 4-vector • Invariant for rotations: Notation • Introducing the metric: Contro-variant 4-vec Co-variant 4-vec • Lorentz-invariant  in terms of scalar, 4-vectors

8. Four vectors

9. Four vectors addition

10. Kinematics example

13. Observables

18. E Ee 2-Body Decay mB mA mC c.m. frame Example

20. Decay Width