quark_1 - gravity • Quarks and Leptons have very...

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PHY3063 R. D. Field Department of Physics quark_1.doc University of Florida The Simple Structure of our Universe Elementary Particle: Indivisible piece of matter without internal structure and without detectable size or shape . . Four Forces: Gravity ( Solar Systems, Galaxies, Curved Space-Time , Black Holes ) Electromagnetism ( ) Weak ( Neutron Decay, Beta Radioactivity ) Strong ( ) Two Classes of Elementary Particles: Leptons: Do not interact with the strong force (but may interact with weak, EM and gravity). Quarks: Do interact with the strong force (may also interact with weak, EM and
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Unformatted text preview: gravity). • Quarks and Leptons have very different properties: 1. Weak and EM forces much weaker that strong force. 2. Quarks have fractional electric charge. 3. Quarks are found only as constituents of composite particles called hadrons ( baryons have B not 0, mesons have B = 0 ) . Leptons exist as free particles. • Gauge Particles are the carriers (or mediators) of the forces: • Electromagnetism – Photon γ (massless) • Weak – Weak Vector Bosons W + , W-, Z (massive) • Gravity – Graviton • Strong – 8 Gluons (massless) Mass and chage located inside sphere of radius zero! Baryon Number...
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This note was uploaded on 05/29/2011 for the course PHY 4064 taught by Professor Fields during the Spring '07 term at University of Florida.

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