Exotic combinations of quarks - A journey of fifty years

University of Chicago
Higgs Centre Seminar Room, JCMB
Friday, November 4, 2016
13:00 to 14:00


The early 1960s witnessed a wealth of elementary particles described in terms of simple
combinations of a few more elementary units, dubbed quarks.  The known mesons and
baryons could all be described as states of quark-antiquark or three quarks.  However,
it was not understood why certain more elaborate combinations, such as
(two quarks + two antiquarks) or (four quarks + one antiquark) had not been observed.  
It has taken nearly half a century, but these "exotic" particles are now beginning to be
seen and understood. This lecture will trace their discovery and interpretation, with an
eye to their future study.