Hadrons and Leptons Flashcards
1
Q
What are hadrons?
A
- Made of quarks
- There are two types of hadrons: baryons and mesons
- Feel the strong force
2
Q
What are baryons? Give examples
A
Made of three quarks. Proton, neutrons and their antiparticles
3
Q
What’s the baryon number of baryons, antibaryons and particles which aren’t baryons?
A
Baryons +1
Antibaryons -1
Other particles 0
4
Q
What are mesons?
A
- Made of quark antiquark pair
- Interact with baryons via the strong force
- Have baryon number 0 because they’re not baryons
- Are unstable
5
Q
Give examples of mesons?
A
Pions, kaons
6
Q
What are pions?
A
- The lightest mesons
- The exchange particle for the strong force
7
Q
What are kaons?
A
- Heavier
- More unstable than pions
- Decay into pions
- Have strangeness
8
Q
What are cosmic ray showers?
A
A source of high energy particles including pions and kaons; observation of stray tracks in a cloud chamber; use of two Geiger counters to detect a cosmic ray showers
9
Q
What are leptons?
A
- Fundamental particles
- Don’t feel the strong nuclear force
10
Q
Give examples of leptons?
A
Electrons, muons
11
Q
What are muons?
A
- Leptons
- Decay into electrons
12
Q
What are neutrinos?
A
- Take part in weak interactions
- The electron and muon have their own neutrinos
- Have nearly no mass
- No charge
