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Leptons At Work

Leptons At Work. Particle Physics Lesson 8. Research Task. some questions to research: What is a positron? Who suggested it must exist? Who discovered it? What is a muon? When was it discovered? Who said, ‘Who ordered that?’ What is a neutrino? Who suggested it must exist?

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Leptons At Work

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  1. Leptons At Work Particle Physics Lesson 8

  2. Research Task • some questions to research: • What is a positron? • Who suggested it must exist? • Who discovered it? • What is a muon? • When was it discovered? • Who said, ‘Who ordered that?’ • What is a neutrino? • Who suggested it must exist? • Who discovered it?

  3. Today’s Objectives To learn about lepton conservation rules Start practicing questions!

  4. Leptons • There are six particle-antiparticle pairs known.  Leptons (Greek – “light thing” or “small coins”) are the smallest of the fundamental particles.  They have the following properties: • fundamental particles without structure • they interact by the weak interaction.  If they are charged, they interact by the electromagnetic interaction, but NOT the strong interaction.

  5. Muon Decay This happens:- But this doesn’t:- Why?

  6. The names of the leptons are:

  7. Do these happen?

  8. Lepton Notes • charge and lepton number are conserved in all allowed lepton processes. • There are three categories of lepton number, Le, Lμ, and Lτ.  Each lepton has a lepton number, 0 or 1, in each category, and each antilepton has a number 0 or -1 in each category.  You need to know the lepton numbers.

  9. Lepton Notes • Each particle has an antiparticle; • for the electron, it is the positron, • the muon the antimuon, • and the tau, the antitau.  • We show the anti-particle either by an opposite charge (e+) or by putting a bar across the symbol.

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