Home page for the EDELWEISS-III experiment
The Edelweiss experiment is dedicated to the direct detection of dark matter particles with bolometric detectors located at the underground laboratory of Modane (the LSM). The results of the stage II of this experiment are published, while the third phase is in scientific exploitation. On this Web site you will find the following sections:
- Some presentations of the experiment, from a wide-audience introduction to a more technical documentation.
- A list of our financing institutions as well as of the collaboration members and the staff in contact with the collaboration.
- All our publications: refereed articles, conference proceedings, theses...
- Some links.
|"FID" Full InterDigit germanium bolometer||The FID bolometers ready at Modane||Final installation of the EDELWEISS-III setup|
|Preliminary limit on low-mass WIMPs (EDELWEISS-III data)||Limits on the axion coupling to electrons (EDELWEISS-II data)|
September 2015 - Preliminary results from a long EDELWEISS-III physics runA long physics run ("Run 308") took place between Summer 2014 and Spring 2015. Preliminary results from a search for low-mass WIMPs were presented at the TAUP conference, using data taken during this run by 8 detectors. The derived limit on the WIMP-nucleon cross-section represents roughly an order-of-magnitude improvment with respect to EDELWEISS-II, for WIMP masses in the 5 to 30 GeV range. It now excludes completely all previous "low-mass WIMP" claims, which confirms results by the SuperCDMS experiment. A publication is in preparation, while further R&D is ongoing to drastically improve the detector sensitivity down to GeV WIMP masses.
Spring 2014 - End of EDELWEISS-III installationThe production of 36 massive bolometers equipped with the specific "FID" technology is done, as well as the preparation of an upgraded facility. The experiment is now ready for data taking...
Summer 2013 - Axion searches with the EDELWEISS-II experiment (arxiv:1307.1815)For the first time, the EDELWEISS experiment presents new constraints on the coupling of axions or "ALP" particles. While EDELWEISS is primarily designed to search for WIMP-induced nuclear recoils, it is also sensitive to axion-induced electron recoils, thanks to its high-exposure, low background and good energy resolution. In this publication we used EDELWEISS-II data to place bounds on axion couplings using four different search channels. The main results are :
- Each of these searches provides a constraint on a given axion coupling or combination of couplings: axion-photon, axion-electron or effective axion-nucleus coupling. For example, we set a 95% CL limit on the coupling to photons <2.13x10^-9 GeV^-1 in a mass range not fully covered by axion helioscopes. We also constrain the coupling to electrons < 2.56x10^-11, similar to the more indirect solar neutrino bound.
- When combining these bounds, we are able to fully exclude the mass range 0.91eV < m < 80keV for the so-called DFSZ axion model, and 5.77eV < m < 40keV for the KSVZ model.