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Particle physics

Particle physics. Particle physics. Aim: Find rules for particles interactions and transformations. Method: Collide particles at high energy to produce interactions and transformations, then track and analyse resulting particles. Particle creation and annihilation follows E = mc 2 .

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Particle physics

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  1. Particle physics

  2. Particle physics Aim: Find rules for particles interactions and transformations. Method: Collide particles at high energy to produce interactions and transformations, then track and analyse resulting particles. Particle creation and annihilation follows E = mc2. SLAC (90 GeV) electrons + positrons CERN LEP 1989-2000 (209 GeV) electrons + positrons Fermilab Tevatron (1.96 TeV) protons + antiprotons CERN LHC (2008-) proton + proton (7TeV) or lead nuclei (574TeV) Many hundreds of kinds of particles are produced. In 1964 Gell-Mann & Zweig independently propose the quark model to explain the ‘particle zoo’

  3. CERN The Large Hadron Collider at CERN Protons collisions at 14 000 000 000 eV. Two ‘general purpose’ experiments: ATLAS and CMS detect collision products.

  4. The ATLAS experiment at CERN

  5. The ATLAS experiment at CERN

  6. What the world is made from Virtual (exchange) particles mediate the fundamental forces • strong force: gluons • electromagnetic: photons • weak interaction: W+, W-, Z • gravity: graviton?

  7. Families of particles hadrons – made of quarks • baryons – heavy particles made of 3 quarks • mesons – medium mass particles, made of quark-antiquark pair leptons – light particles e.g. electron, neutrino Beta decay

  8. Bosons: carriers of interactions

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