1.7 Conservation laws in particle physics

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6 Terms

1

What are the conservation laws.

  • conservation of charge

  • conservation of baryon number

  • conservation of lepton number.

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2

What are the four fundamental forces of the universe?

  • gravitational

  • weak

  • strong

  • electromagnetic

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3

Gravitational force

  • all matter

  • infinite range

  • is the weakest of the fources.

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4

Weak

  • leptons, and quarks

  • short range

  • change in quark flavour

  • 10^-10 lifetime

  • if neutrinos are present it is weak.

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5

strong

  • 10^-24 lifetime

  • all particles are hadrons

  • leptons dont feel it

  • no change in quark flavour

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6

electromagnetic

  • short lifetime 10^-12 10^-18

  • if gamma photon emitted it is em

  • charged particles only

  • no change in quark flavour

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