Leptons And Hadrons Flashcards
What are all particles either?
Leptons or Hadrons
Name the features of Leptons?
lightest group of particles. have spin +- 1/2 acted upon by a weak nuclear force fundamental particles - cannot be subdivided. have a lepton number L+1 , anti particles are (L) - 1
Name all 6 Leptons?
electron electron neutrino muon muon neutrino tau tau neutrino
Symbol for a lepton ?
x= either e for electron , u for muon, T for tau along with a minus
How are hadrons subdivided?
Hadrons are subdivided into Baryons and mesons
What are baryons?
Facts about them?
Made of 3 quarks
heaviest group of particles
not fundamental
Example of a Baryon?
proton and neutron
stable baryon?
Proton- has a long half life
do baryons have long lives?
no - most last around x 10^10 seconds
What are the baryons?
proton neutron lambda sigma xi
What are mesons?
particle made of a quark and antiquark
Facts about mesons?
masses intermediate between baryons and leptons.
not fundamental
very short lived
types of mesons? How they are what they are?
Kaon- must have a strange quark.
pion
