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Updated: August 17, 2000
This is a proposal to build a state-of-the-art 4-pi hermetic spectrometer to detect the production and decays of mesons produced in photon-induced reactions. The goal is a systematic study of the meson spectrum up to about 2.5 GeV/c2 - below the threshold for charm production - to search for unusual mesons and gluonic excitations.
Such a study, over the desired meson mass range, requires photon energies from 8 to 10 GeV. The January, 1998 Road Map for Jefferson Lab lays out a plan for such an energy upgrade from the current 4 GeV CEBAF accelerator. To accommodate the spectrometer, a new experimental hall (Hall D) would be built with a beamline to deliver electrons from the stub of the North Linac of the CEBAF accelerator complex.
The upgrade and Hall D plans are also presented in the report of the Subcommittee chaired by Dr. James Symons (LBNL) - the NSAC review of DOE-Sponsored Medium Energy Nuclear Science (see pages 26-27 of the report). A review of the science of meson structure and excited states is also presented in this report (see pages 14-15).
Agenda and background material for the Hall D workshops and mini-workfests:
The Hall D plan, as presented at the Jefferson Lab Workshop, is available [PDF].
The working group consists of high energy physicists and nuclear physicists. Funding will be sought from the DOE and NSF. [see the Bjorken/Heppelmann discussion about funding QCD research]