Particles

Particles

1. classification of particles

   • leptons(e+, e-, u+, u-, V)
     • fundamental( no quarks)
     • feels weak interaction
     • lepton number = +/- 1
     • baryon number = 0
     • strangeness = 0
   • Hadrons
     • Feel strong force
     • contain quarks ( up, down, strange)
     • mesons
       • lepton number = +/- 1
       • baryon number = 0
       • contains quark and anti quark.
       • pions ( strangeness = 0 )
       • kaons
         • strangeness = +/- 1
         • contains strange quarks.
     • Baryons (p, n, anti-proton and neutron)
       • baryon, lepton and strangeness number = 0
       • 3 quarks or antiquarks.
   • exchange particles
     • pion
       • strong nuclear force
         • repulsive up to 0.5Fm
           • attractive up to 3Fm
     • photon
     • bosons
       • B+ and B- decay
       • electron capture
       • electron proton collision
     • graviton