Particle Physics - FSU Physics Department

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<strong>Particle</strong> Zoo 1940’s to 1960’s : • Plethora of new particles discovered (mainly in cosmic rays): • e-, p, n, ν, μ - , π ± , π 0 , Λ 0 , Σ + , Σ 0 , Ξ,…. question: • Can nature be so messy? • are all these particles really intrinsically different? • or can we recognize patterns or symmetries in their nature (charge, mass, flavor) or the way they behave (decays)? 22
<strong>Particle</strong> spectroscopy era 1950’s – 1960’s: accelerators, better detectors even more new particles are found, many of them extremely short-lived (decay after 10 -21 sec) “particle spectroscopy era” • Bubble chamber allows detailed study of reactions, reconstruction of all particles created in the reactions • find that often observed particles actually originate from decay of very short-lived particles (“resonances”) 1962: “eightfold way”, “flavor SU(3)” symmetry (Gell-Mann, Ne’eman) • allows classification of particles into “multiplets” • Mass formula relating masses of particles in same multiplet • Allows prediction of new particle Ω - , with all of its properties (mass, spin, expected decay modes,..) • subsequent observation of Ω - with expected properties at BNL (1964) 23
Page 1 and 2: Particle Physics Particle physics
Page 3 and 4: About Units Energy - electron-volt
Page 5 and 6: Sizes and distance scales Molecule
Page 7 and 8: Contemporary Physics Education 7 Pr
Page 9 and 10: Issues of High Energy Physics Issue
Page 12 and 13: Positron Positron (anti-electron)
Page 14 and 15: Neutron Bothe + Becker (1930): •
Page 16 and 17: Nuclear force - field quantum phot
Page 18 and 19: Discovery of pion in 1947, Lattes,
Page 20 and 21: “Strange particles” Kaon: disc
Page 24 and 25: Particle nomenclature by mass: •
Page 26 and 27: Towards the standard model Quark M
Page 28 and 29: color charge problem with quark mo
Page 30 and 31: Standard Model A theoretical model
Page 33 and 34: From Contemporary Physics Education
Page 36 and 37: From Contemporary Physics Education
Page 38 and 39: Electroweak interactions leptons (
Page 40 and 41: Brief History of the Standard Model
Page 42 and 43: Brief History of the Standard Model
Page 44 and 45: Present scenario Most of what’s
Page 46 and 47: Homework set 5 HW 5.1 • go to Pa

Particle Physics - FSU Physics Department

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