phystk - Particle Physics Outline: s s s s s s s s Wh y d o...

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Particle Physics Why do  pa rtic le  phys ic s ? S ta nda rd m o de l pa rtic le  phys ic s  is  hig h e ne rg y phys ic s a c c e le ra to rs de te c to rs trig g e rs , da ta  re c o rding a na lys is inte rpre ta tio n            We b pa g e s  o f inte re s t  http://www-d0.fnal.gov    (Fermilab homepage) http://sg1.hep.fsu.edu/~wahl/Quarknet/index.html   (has links to many  particle physics sites) http://www.fnal.gov/pub/tour.html                   (Fermilab particle  physics tour) http://ParticleAdventure.org/                         (Lawrence Berkeley Lab.) http://www.cern.ch  (CERN  -- European Laboratory for Particle  Physics) Outline:
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Goals of particle physics particle physics or high energy physics   is looking for the  smallest constituents of matter  (the  “ultimate building blocks”) and for the  fundamental forces   between them; aim is to find  description in terms of the smallest number of  particles and forces  (“interactions”)  at given length scale, it is useful to describe matter in terms of  specific set of constituents which can be treated as  fundamental;          at  shorter length scale, these fundamental constituents may turn  out to consist of smaller parts (be “composite”).  in 19th century, atoms were considered smallest building blocks, early 20th century research:  electrons, protons, neutrons; now evidence that nucleons have substructure - quarks;  going down the size ladder: atoms -- nuclei -- nucleons -- quarks  -- preons ???. .. ??? 
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Issues of High Energy Physics Why? To understand more organized  forms of matter To understand the origin and destiny of the universe.  Basic questions: Are there irreducible building blocks? Are there few or infinitely many? What are they?  What are their properties? What is  mass ? What is  charge ? What is  flavor ? How do the building  blocks interact? Why are there 3 forces?  gravity, electroweak, strong (or are there more?)
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Standard   Model A theoretical model of interactions of  elementary particles Symmetry:  SU(3) x SU(2) x U(1) “Matter particles” quarks up, down, charm,strange, top bottom leptons electron, muon, tau, neutrinos “Force particles” Gauge Bosons γ  (electromagnetic force) W ± , Z (weak, elctromagnetic) g gluons  (strong force) Higgs boson spontaneous symmetry breaking of SU(2) mass
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Standard Model
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Building Blocks Fundamental Forces: Bosons Point-like Particles: Fermions For c e   Bos on  Mas s (Ge V)   S t r e ngt h   r avit y  G ?   ?   5 × 10 - 3 9   E- M  γ 0  
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This note was uploaded on 02/13/2012 for the course ECO/HC 561 taught by Professor Lazzale during the Spring '11 term at University of Phoenix.

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phystk - Particle Physics Outline: s s s s s s s s Wh y d o...

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