Feynman Diagrams Flashcards
(7 cards)
1
Q
What can Feynman diagrams be used for?
A
Calculating the probability of a process occurring in particle physics
2
Q
What are external lines?
A
The particles in the initial and final states
3
Q
What are vertices?
A
The points at which particle interact
Conservation laws apply at every vertex
4
Q
What are internal lines?
A
Represent the transfer of quantum numbers and energy
5
Q
Steps for drawing a Feynman diagram?
A
Consider the force involved
Consider any spectator particles/quarks
Consider what has changed
6
Q
What is the hierarchy of forces?
A
Strong-Strong and Fast
EM-Middle strength and medium speed
Weak-Weak and slow
7
Q
What are virtual particles?
A
A particle which can have any mass needed to conserved energy/momentum
These are never observed
