Strange Hadron Spectroscopy with a Secondary KL Beam at GlueX

We propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab to be used with the GlueXexperimental setup for strange hadron spectroscopy. A flux on the order of 3 x 10^4 KL/s will allow a broad range of measurements to be made by improving the statistics of previous data obtained on hydrogen targets by three orders of magnitude. Use of a deuteron target will provide first measurements on the neutron which is {\it terra incognita}. The experiment will measure both differential cross sections and self-analyzed polarizations of the produced {\Lambda}, {\Sigma}, {\Xi}, and {\Omega} hyperonsusing the GlueXdetector at the Jefferson Lab Hall D. The measurements will span c.m. cos{\theta} from -0.95 to 0.95 in the c.m. range above W = 1490 MeV and up to 3500 MeV. These new GlueXdata will greatly constrain partial-wave analyses and reduce model-dependent uncertainties in the extraction of strangeresonance properties (including pole positions), and provide a new benchmark for comparisons with QCD-inspired models and lattice QCDcalculations. The proposed facility will also have an impact in the strangemeson sector by providing measurements of the final-state K{\ pi} systemfrom threshold up to 2 GeV invariant massto establish and improve on the pole positions and widths of all K*(K{\pi}) P-wave states as well as for the S-wave scalar meson{\kappa}(800).