Physics 1.5 Particle Interations Flashcards
What are the four fundamental interactions?
There exist four fundamental interactions:
* strong nuclear
* weak nuclear
* electromagnetic
* gravity
In strong nuclear interactions, what are the gauge boson and the particles affected?
Gauge Boson: pions (π+, π0, π-)
Particles affected: Hadrons only
In electromagnetic interactions, what are the gauge boson and the particles affected?
Gauge boson: Virtual Photon (γ)
Particles affected: Charged particles only
In weak nuclear interactions, what are the gauge boson and the particles affected?
Gauge Boson: W+ and W- bosons
Particles affected: All Types
In gravitational interactions, what are the gauge boson and the particles affected?
Gauge boson: Gravitron
Particles affected: Those with mass
When there is a force between elementary particles, how are energy and momentum transferred?
Energy and momentum are transferred by the exchange particle.
What are all forces caused by?
All forces are caused by particle exchange, as you cannot have instantaneous action at a distance.
How can reations and interactions be represented?
Reactions or interactions, in terms of the incoming and outgoing particles and exchange particles, can be represented using Feynman diagrams.
What is conserved at each vertex on a Feynman diagram?
At each vertex, charge, baryon number and lepton number are conserved.
TASK
Draw a Feynman diagram for beta-minus decay.
TASK
Draw a Feynman diagram for beta-plus decay.
TASK
Draw a Feynman diagram for electron capture.
TASK
Draw a Feynman diagram for electron-proton collision.
TASK
Draw a Feynman diagram for two electrons repelling.
TASK
Draw a Feynman diagram for two positrons repelling.
