Particle Summary Flashcards
What are the four fundamental forces and their exchange particles?
- Strong Nuclear (Gluon)
- Weak (Z, W+, W-)
- Electromagnetic (virtual photon)
- Gravity (graviton)
What are examples of leptons?
Electron Electron neutrino Muon Muon neutrino Tau Tau neutrino
What force is the lepton subject to?
- They do not feel the strong force
2. They are subject to the weak force
What are hadrons defining feature?
They feel the strong force
What is the structure of baryons?
Three quarks
What is the structure of mesons?
Quark-antiquark pair
What are examples of baryons?
Proton (uud) (only stable baryon)
Neutron (udd)
What are examples of mesons?
Pion (pi+) (ubard)
Kaon(K+) (ubars)
What is always conserved in particle interactions?
Charge Momentum Mass-Energy Lepton Number Baryon number (Strangeness in strong but not in weak interactions)
What do muons decay into?
Electrons
What happens during Beta minus decay?
A d quark changes into a u quark
What happens during Beta plus decay?
A u quark changes into a d quark
What charges do quarks have?
+1/3, -1/3, +2/3, -2/3
What baryon numbers do quarks have?
+1/3, -1/3
What strangeness do quarks have?
+1, 0, -1
What charge of up quark?
+2/3 e
What charge of down quark?
-1/3 e
What change of s quark?
-1/3 e
Which baryons is stable?
Free protons are stable and all other baryons will eventually decay into protons
What is the quark structure of pion -?
d baru
What is the quark structure of pion+?
u bard
What is the quark structure of pion0?
Ubaru or dbard (this is its own antiparticle) (pion+ and minus are antiparticles of each other)
What is the quark structure of kaon+?
Ubars
What is the quark structure of kaon-
Sbaru
What is the quark structure of kaon0?
Dbars (antiparticle= sbard) (K+ and K- are antiparticles of each other)
What is the strangeness of K+?
+1
What is the strangeness of K-?
-1
What sit eh strangeness of K0?
-1
Are kaons stable?
Kaons are not stable and decay via the weak interaction
