[Jlabsa_gs] Pizza Seminar - Wednesday, July 17, 2013 - A message from Hari Areti

Jodi Patient patient at jlab.org
Tue Jul 16 09:56:43 EDT 2013


Jefferson Lab's Graduate Student and Post-Doc Association Wiki:
  https://gspda.jlab.org/wiki/index.php/Main_Page

   Please RSVP to:  patient at jlab.org by COB on July 16, 2013

                    Wednesday, July 17, 2013

                          ***F113***

                        12:00-1:00 pm


                  "Light Quark Exotic Mesons"


                         D.P. Weygand

                      Jefferson Laboratory

Abstract:  QCD inspired models of hadrons have long suggested the existence of mesons 
beyond the Naive Quark Model (NQM). Observation of states outside of the NQM provide 
insight on the nonperturbative regime of QCD. Two such states have been reported: the 
π(1400) and the π(1600), both with JPC = 1-+ and with pion beams. There are suggestions 
that photoproduction gluonic hybrids with these quantum numbers may be enhanced. To that 
end, the g12 experiment at Jefferson Lab's CEBAF Large Acceptance Spectrometer (CLAS) 
has recently acquired a high statistics photoproduction dataset, using a liquid hydrogen 
target and tagged photons from a 5.71 GeV electron beam. The CLAS experimental apparatus 
was modified to maximize forward acceptance for peripheral production of mesons. The 
resulting data contains the world's largest 3π photoproduction dataset, with γρ→π+π+π-n 
events numbering in the millions. Results of a partial-wave analysis in search of the 
exotic π1(1600) and π(1400) will be compared to the existing evidence.









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