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Classifying the particle zoo

Classifying the particle zoo. Strange particles. Strange particles were created in reactions like:. STRANGE!. Strangeness 0 0 -1 +1. Strange particles appear and disappear in pairs. Conservation of strangeness!. The eight-fold way.

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Classifying the particle zoo

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  1. Classifying the particle zoo

  2. Strange particles Strange particles were created in reactions like: STRANGE! Strangeness0 0 -1 +1 Strange particles appear and disappear in pairs Conservation of strangeness!

  3. The eight-fold way • Suggested by Murray Gell-Man and Yuval Ne’eman • Based on group theory (the group SU(3) is used to classify particles) • Title comes from Buddhism

  4. strangeness charge isospin

  5. Quarks • Suggested by Murray Gell-Mann and George Zweig • Each baryon has 3 quarks • Each meson has 2 quarks • Leptons are different • Name comes from James Joyce’s ‘Finnegan’s Wake’

  6. What quarks are there? • Ordinary matter (n and p and p) consists of up (u) and down (d) quarks • u has charge • d has charge • s is a heavy version of d

  7. udd uud dds uds uus dss uss

  8. ddd udd uud uuu dds uds uus dss uss sss

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