Draw the Feynman diagrams for the following reactions. Draw the diagrams at the quark-lepton level. Show only the lowest order process (least number of vertices.)

  1. neutron decays to a proton, electron and an anti-electron neutrino

  1. pi-plus decays to mu-plus and a muon neutrino

  1. positive muon decays to a muon antineutrino, a positron and an electron neutrino

  1. K zero decays to a  pi-minus and pi-plus via the weak interaction

  1. lambda zero decays to a proton and a pi-minus via the weak interaction

  1. a sigma plus decays to a proton and a pi-zero via the weak interaction

  1. electron positron annihilation to two photons

  1. xi-zero decays to a lambda zero and a pi-zero

  1. positive kaon decays to three pions

  1. sigma-zero decays to lambda zero and a photon

  1. omega minus decays to xi-zero and a negative pion

  1. positive kaon interacts with a proton to produce a neutral kaon and a delta++

  1. antiproton interacts with a proton to produce a neutron and an antineutron

  1. omega-minus decays to xi-zero, an electron and an electron antineutrino