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Physics and Astronomy

Physics & Astronomy Colloquium

3:30 PM, Friday, February 27, 2009
Room 155, Chem-Phys Building

Dr. David Tucker-Smith
Department of Physics
Williams College

Last year the DAMA/LIBRA dark matter direct detection experiment confirmed the annual modulation signal reported previously by DAMA/NaI, with the signal significance now above 8 sigma. Assuming that this signal is in fact due to WIMP scattering off of nuclei, the question becomes how these WIMPs have evaded detection at other experiments at such as CDMS and XENON. I will discuss the idea that the dark matter particles dominantly scatter inelastically - by making a transition to a slightly heavier state - and will show that within this scenario all current results from direct detection experiments are consistent. I will describe the distinctive features of inelastic dark matter and present predictions for upcoming experiments, where the scenario will either be confirmed or ruled out.

Refreshments will be served in CP 177 at 3:15 PM