particle conservation rules Flashcards

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1
Q

Particle interaction rules

A

the following properties are conserved in particle interactions:

  • momentum
  • mass- energy (E = mc^2)
  • charge (+,-,0)
  • lepton number
  • baryon number
  • strangeness
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2
Q

Charge conservation

A

“the total charge after an interaction is equal to the total charge before an interaction”

e. g. beta decay (n–> p + e- + v-)
- charge before= 0
- charge after= (+1) + (-1) + 0=0

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3
Q

Lepton number conservation

A

“the total lepton number after an interaction is equal to the total lepton number before an interaction”

  • a lepton (e.g. electron) =1
  • an antilepton (e.g. antineutrino) =-1
  • all other particles have lepton number =0
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4
Q

Baryon number conservation

A

“the total baryon number after an interaction equals the total baryon number before an interaction”

  • a baryon (e.g. neutron) =1
  • an antibaryon (e.g. antiproton) =-1
  • all other particles have baryon number =0
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5
Q

Strangeness conserved

A

“the total strangeness after an interaction equals the total strangeness before an interaction”

  • a strange particle (e.g. k+ kaon) =1
  • a strange antiparticle (e.g. k- kaon) =-1
  • all other particles have a strangeness =0
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