School of Arts & Sciences Dean’s Coffee Presentation SUNY Institute of Technology, February 4, 2005 High Energy Physics: An Overview of Objectives, Challenges and Outlooks Amir Fariborz Amir Fariborz Dept. of Math./Science Dept. of Math./Science SUNY Institute of Technology SUNY Institute of Technology Utica, New York Utica, New York
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School of Arts & Sciences Dean’s Coffee Presentation SUNY Institute of Technology, February 4, 2005 High Energy Physics: An Overview of Objectives, Challenges.
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School of Arts & Sciences Dean’s Coffee Presentation SUNY Institute of Technology, February 4, 2005
High Energy Physics: An Overview of Objectives, Challenges
and Outlooks
Amir FariborzAmir Fariborz
Dept. of Math./ScienceDept. of Math./Science
SUNY Institute of TechnologySUNY Institute of Technology
Means and Techniques:Means and Techniques: ExperimentalExperimental
Theoretical Theoretical
Strong InteractionStrong Interaction Hadrons, and their Strong InteractionHadrons, and their Strong Interaction
Models for the Physics of Hadrons Models for the Physics of Hadrons
Future OutlooksFuture Outlooks
Introduction:
What is an elementary particle?What is an elementary particle?
Introduction:
What is an elementary Particle?What is an elementary Particle? A pA particle that is not consist of other particles article that is not consist of other particles
Introduction:
What is an elementary Particle?What is an elementary Particle? A pA particle that is not consist of other particles article that is not consist of other particles
Ex. Water molecule is NOT elementaryEx. Water molecule is NOT elementary
OH
H
Introduction:
What is an elementary Particle?What is an elementary Particle? A pA particle that is not consist of other particles article that is not consist of other particles
Ex. Water molecule is NOT elementaryEx. Water molecule is NOT elementary
Atoms and molecules are not elementary.Atoms and molecules are not elementary.
Physics Nobel Prize (2004)Gross, Politzer & Wilczek
Experimental ObservationPhysics Nobel Prize (1990)Friedman, Kendall & Taylor
Why are there two different types of mass for light quarks?
Low energy processes:
High energy processes:
The computational difficulty:
A simple description:A simple description:
F(F(aa) = F(0) + F’(0) ) = F(0) + F’(0) aa + ½ F’’(0) + ½ F’’(0) aa2 2 + … + …
The computational difficulty:A simple description:A simple description:
F(F(aa) = F(0) + F’(0) ) = F(0) + F’(0) aa + ½ F’’(0) + ½ F’’(0) aa2 2 + … + …
Strength of interactionStrength of interaction
energy energy
a
Theory of Strong Interactions:
energyQCD is a non abelian gauge field theory based on the color quantum number of quarks
?
Effective theories: Models that are formulated in terms of hadrons
Chiral perturbation theory (< 500 MeV)
Chiral Lagrangians (< 2 GeV)
…
Lattice QCD: Computes physical quantities by directly working with the quark fields
QCD Sum-rules: Provides a bridge between QCD and the physics of hadrons
J=0 J=0,1,2 …
Chiral Lagrangian probe of intermediate states:
+ + …
Symmetries of the low energy strong
interaction
Lagrangian
Future Outlook:
A number of important experiments will be A number of important experiments will be performed within the next 10-15 yearsperformed within the next 10-15 years
Exciting directions for research in HEP, such as Exciting directions for research in HEP, such as neutrino physics, CP violation, beyond the SM, neutrino physics, CP violation, beyond the SM, SUSY, Higgs physics, …SUSY, Higgs physics, …
Students can participate at different levels, from Students can participate at different levels, from undergraduate projects to Ph.D. thesesundergraduate projects to Ph.D. theses