Quantum Chromodynamics John Christie & Jude Rowe Santa Rosa Junior College Physics 43 Spring 2009.

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Presentation transcript:

Quantum Chromodynamics John Christie & Jude Rowe Santa Rosa Junior College Physics 43 Spring 2009

What we will be discussing A Brief History of QCD What is QCD? Implications

History of QCD Early 1950’s: Discovery of Hadrons inside “Elementary Particles” Attempts to sort particles using QED, strangeness, led to Eightfold Way 1963: Theory of smaller particles inside Hadrons called partons, or Quarks.

Creation of QCD Δ++ particle and Ω- had three quarks with parallel spin, violating the Pauli exclusion principle Proposal by Han, Nambu, and Greenburg that these quarks had an additional degree of freedom, “color charge”. Experiments later verified existence of gluons, exchange particles that carry said “color charge”

What is QCD? QCD was created based on QED’s inability to explain all quark interactions Eightfold Way of MesonsColor Chart

Numerical Analysis To calculate QCD we use equations similar to Boltzman equations …faster computers are required in order to mathematically model and compute these interactions

Implications of QCD Defines a new quantum number through Asymptotic freedom Grand Unified Theory Increased demand on technology for research and verification of QCD

Proving QCD? Confinement prevents direct observation of free Quarks and Gluons Some verification of QCD using CERN (a few percent) Lattice QCD computations theoretically predict but not analytically prove QCD theory Phases of Quark Matter

Chemical Potential Temperature

Resources _History/id/ http:// _History/id/ r=0&output=xml_no_dtd&sort=date%3AD%3AL%3Ad1&entsp=a&client=def ault_frontend&ud=1&y=0&oe=UTF-8&ie=UTF- 8&proxystylesheet=default_frontend&x=0&site=default_collectionhttp://google1.aps.org/search?q=QCD+history&btnG=Google+Search&entq r=0&output=xml_no_dtd&sort=date%3AD%3AL%3Ad1&entsp=a&client=def ault_frontend&ud=1&y=0&oe=UTF-8&ie=UTF- 8&proxystylesheet=default_frontend&x=0&site=default_collection bin/spiface/find/hep/www?FORMAT=WWW&rawcmd=fin+au+Altarelli%2CGhttp://www-spires.slac.stanford.edu/cgi- bin/spiface/find/hep/www?FORMAT=WWW&rawcmd=fin+au+Altarelli%2CG Thorton, Stephen T. Modern Physics for Scientists and Engineers. 3rd Ed.