Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session J3: Dark Matter I |
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Sponsoring Units: DAP DPF Chair: Thomas Shutt, Princeton University Room: Marriott Tampa Waterside Grand Salon A/B |
Sunday, April 17, 2005 10:45AM - 11:21AM |
J3.00001: Discovering and Testing Dark Matter in the Lab Invited Speaker: I will review the different theoretical models of particle dark matter and their collider signatures. I will then derive model-independent predictions for the rate of missing energy signals due to dark matter production at colliders. I will also discuss the expected precision of measuring dark matter properties at colliders and testing the dark matter hypothesis. Finally, I will present model-independent predictions for dark matter signals in indirect detection experiments. [Preview Abstract] |
Sunday, April 17, 2005 11:21AM - 11:57AM |
J3.00002: Results from CDMS II Invited Speaker: The Cryogenic Dark Matter Search (CDMS II) employs low-temperature detectors to search for interactions of WIMPs while discriminating against interactions of background particles. In 2004 we completed the experiment's first two runs at the Soudan Underground Laboratory, for which the background from neutrons is negligible. For the first run, four Ge and two Si detectors were operated for 52.6 live days, resulting in the world's lowest exclusion limits on the coherent WIMP-nucleon scalar cross-section for all WIMP masses above 15 GeV, and ruling out a significant range of neutralino supersymmetric models. The second run included twice the number of detectors and lasted longer than the first, resulting in an exposure of approximately 100 kg days. A blind analysis was performed using only calibration data to define the energy threshold and selection criteria for WIMP candidates. Results of this second, most recent dataset will be presented and compared to previously published results. We will discuss the plans for future running and the projected sensitivity. [Preview Abstract] |
Sunday, April 17, 2005 11:57AM - 12:33PM |
J3.00003: The XENON10 Dark Matter Experiment Invited Speaker: The XENON Dark Matter Project uses liquid xenon as target and detector to search for dark matter particles with a sensitivity reach more than a factor of thousand beyond current limits. The 1000 kg target is distributed in an array of ten independent, two-phase time projection chambers with simultaneous measurement of ionization and scintillation. The distinct ratio of the two signals for nuclear recoil events (from dark matter WIMPs and neutrons) and for electron-like events (from dominant gamma-rays background) is the basis for XENON event-by-event discrimination capability. The detector's 3D event localization and the active shield of liquid xenon scintillator which surrounds the target, provide additional background rejection capabilities. As part of the XENON R\&D phase, supported by NSF, we have carried out a series of measurements with dual phase TPC prototypes, aimed at optimizing light and charge response to nuclear recoils down to an energy threshold of 16 keV. I will review the progress achieved to date, and present the status of the development of XENON10. This detector, with an active target of 10kg, is being realized as the first step in the XENON phased approach towards the full 1 tonne scale experiment. The expected performance and sensitivity of XENON10 will be also presented. [Preview Abstract] |
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