Hadrons And Leptons Flashcards
What are hadrons?
Particles that can feel the strong nuclear force
Are hadrons fundamental particles?
No
What are hadrons made up of?
Quarks
What are the 2 types of hadrons?
Baryons and mesons
2 examples of baryons?
Protons and neutrons
What can you say about all baryons except a free proton?
What does this mean?
Can be unstable
All baryons except protons decay to become other particles
What are the antiparticles of baryons?
Antibaryons
Why don’t you find antibaryons in ordinary matter?
Antiparticles are annihilated when they meet the corresponding particle
What is the baryon number?
Number of baryons
What is the baryon number that means it must be conserved?
Quantum number
What happens to the total baryon number when particles interact and produce or emit new particles?
Stays the same
What does beta minus decay involve?
A neutron changing into a proton
What is beta decay caused by?
Weak interaction
When a neutron decays, what is formed?
Proton
Electron
Antineutrino
What do mesons interact with baryons via?
Strong force
Are mesons stable or unstable?
Unstable
What are the 2 types of mesons?
Pions and kaons
What are pions?
Lightest mesons
What are kaons?
Mesons that are heavier and more unstable than pions
What are leptons?
Fundamental particles that don’t feel the strong nuclear force
How do leptons interact with other particles via?
Weak interaction
Name a stable lepton?
Electron
Name an unstable lepton?
Muon
What do electron and muon leptons each come with?
Their own neutrino
What is the charge and mass of neutrinos?
0 mass
0 charge
Like the baryon number, what is the lepton number?
A quantum number
What is the lepton number?
Number of leptons
When are antineutrinos released?
In beta-minus decay
What must be remembered about both baryon number and the 2 separate types of lepton number?
Must be conserved in all particle interactions
