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تسجيل مستخدم جديدStrange Hadron Spectroscopy with a Secondary KL Beam at GlueX
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M.J. Amaryan
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We propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab to be used with the GlueX experimental 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} hyperons using the GlueX detector 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 GlueX data will greatly constrain partial-wave analyses and reduce model-dependent uncertainties in the extraction of strange resonance properties (including pole positions), and provide a new benchmark for comparisons with QCD-inspired models and lattice QCD calculations. The proposed facility will also have an impact in the strange meson sector by providing measurements of the final-state K{pi} system from threshold up to 2 GeV invariant mass to 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).
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We propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab to be used with the GlueX experimental setup for strange hadron spectroscopy. The superior CEBAF electron beam will enable a flux on the order of $1times 10^4~K_L/sec$,
which exceeds the flux of that previously attained at SLAC by three orders of magnitude. The use of a deuteron target will provide first measurements ever with neutral kaons on neutrons. The experiment will measure both differential cross sections and self-analyzed polarizations of the produced $Lambda$, $Sigma$, $Xi$, and $Omega$ hyperons using the GlueX detector at the Jefferson Lab Hall D. The measurements will span CM $costheta$ from $-0.95$ to 0.95 in the range W = 1490 MeV to 2500 MeV. The new data will significantly constrain the partial wave analyses and reduce model-dependent uncertainties in the extraction of the properties and pole positions of the strange hyperon resonances, and establish the orbitally excited multiplets in the spectra of the $Xi$ and $Omega$ hyperons. Comparison with the corresponding multiplets in the spectra of the charm and bottom hyperons will provide insight into he accuracy of QCD-based calculations over a large range of masses. The proposed facility will have a defining impact in the strange meson sector through measurements of the final state $Kpi$ system up to 2 GeV invariant mass. This will allow the determination of pole positions and widths of all relevant $K^ast(Kpi)$ $S$-,$P$-,$D$-,$F$-, and $G$-wave resonances, settle the question of the existence or nonexistence of scalar meson $kappa/K_0^ast(700)$ and improve the constrains on their pole parameters. Subsequently improving our knowledge of the low-lying scalar nonet in general.
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