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DTSTAMP:20260415T150753
DTSTART:20140424T153000
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URL:https://murmitoyen.com/events/vanille/udem/detail/423165
LOCATION:Université de Montréal - Pavillon Claire-McNicoll\, 2900\, chemi
 n de la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Dark Matter Direct Detection with SuperCDMS
DESCRIPTION:Yohan Ricci Queen's UniversityDark Matter (DM) is thought to ma
 ke up  84.5% of the matter content of the universe. It is a key ingredien
 t of the standard model of cosmology (CDM) and could provide a window to 
 new theories beyond the standard model of particle physics. The Super Cryo
 genic Dark Matter Search (SuperCDMS) experiment is currently operating 15 
 new and improved germanium detectors at the Soudan Underground Laboratory 
 in Minnesota\, USA. Those detectors are used to search for Weakly Intereat
 ing Massive Particules (WIMPs) with masses in the range of 10 GeV to 10 Te
 V with a regular' high threshold analysis. They were also recently used to
  obtain two important results in the search for low-mass WIMPs with dedica
 ted low threshold analyses. The seminar will focus on CDMS results and in 
 particular the two aforementioned low-mass WIMP results. I will present th
 e results and prospects of a special operational mode with a very low ioni
 zation threshold called CDMSlite (CDMS low ionization threshold experiment
 ). For this innovative experiment\, we operated a single detector with a h
 igher voltage than usual and we were able to measure a much smaller ioniza
 tion signal than the regular experiment at the expense of background rejec
 tion capabilities. Thanks to this feature\, we obtained the lowest thresho
 ld in a germanium detector experiment allowing us to explore new WIMP para
 meter space below 6 GeV. A longer run in this mode started in February 201
 4 and will continue for several months. I will also present a special low 
 threshold analysis (at regular voltage) which used both the phonon and ion
 ization information of the new detectors to perform an efficient backgrou
 nd rejection. The results of this analysis are in tension with the WIMP in
 terpretation of excess events in several experiments.
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