Short recap on the Standard Model
Feynman diagrams, units and kinematics Decay Rates and Cross-sections
Elementary Particle Physics:
theory and experiments
Prof. dr hab. Elżbieta Richter-Wąs
Follow the course/slides from M. A. Thomson lectures at Cambridge University
Course will concentrate on the modern view of particle physics with the emphasis on how theoretical concepts relate to recent experimental measurements.
Review of the Standard Model
2
Matter in the Standard Model
3
Forces in the Standard Model
4
5
Standard Model vertices
6
Fundamental interactions in the decay
Decay of the fundamental particles all involve the weak charged current, the only one allowing for a change of flavour. At rest, it is very much
suppressed by the W mass in the propagator.
7
Fundamental interactions in the decay
Feynman diagrams
8
Special relativity and 4-vector notation
9
Mandelstam s, t and u
10
Example: Mandelstam s, t and u
11
*
Natural Units
12
Heaviside-Lorents Units
13
From Feynman diagrams to physics
14
Cross-sections and decay rates
15
The first few lectures
16
Paricle decay rates
17
Non-relativistic phase-space (revision)
18
Dirac d function
19
20
The Golden Rule revisited
21
Lorentz invariant phase-space
22
Decay rate calculations
23
24
25
Cross-section definition
26
example
27
Cross-section calculations
28
29
2-> 2 Body Scattering in C.o.M. Frame
30
(4)
31
32
Lorentz invariant differential cross-section
33
2->2 body scattering in the Lab Frame
34
35
36
Summary
37
Summary cont.
38
Appendix I: Lorentz Invariant Flux
39
Appendix II: general 2->2 scattering in lab frame
40
41
42
