SPECIAL JOINT PARTICLE SEMINAR

Date: Tuesday, 11 March 2003  Time: 3:00 p.m.

Place: 4135 Frederick Reines Hall

Speaker: Harry Lipkin,
Weizmann and Tel Aviv University

Title: Experimental Challenges for QCD -- The Past and the Future

Abstract: QCD is supposed to explain everything about Hadron Physics - But How? QED is supposed to explain everything about Superconductivity.  Will explaining Hadron Spectrocopy from QCD be as difficult as explaining Superconductivity from QED?
 
The Past leaves us with many experimental regularities which await explanation by QCD.  Surprising agreement with experiment from simple Sakharov-Zeldovich model (1966) having quarks with effective masses and hyperfine interaction.  Nambu's (1966) Colored quarks with gauge gluons gave mass spectrum with only $qqq$ and $\bar q$ bound states.  The topological quark-line OZI rule does not follow from any symmetry and predicts  experiments successfully without any solid theoretical justification.
 
The future offers many new experimental opportunities to learn about QCD from heavy flavor physics. Weak Decays need hadron models and QCD to interpret decays, but have too many diagrams, too many free parameters, too many decay modes, too much data. Need phenomenologists to choose data for analysis. Experimental results from B and Charm factories that defy conventional wisdom can provide clues to new physics and inadequacies in hadron models.


Host: J. Feng