World’s most sensitive dark matter detector completes search

From DOE/Lawrence Berkeley National Laboratory:

IMAGE: Inside view of the LUX detector. view more

Credit: Photo by Matthew Kapust/Sanford Underground Research Facility

LEAD, SD, USA / SHEFFIELD, UK — The Large Underground Xenon (LUX) dark matter experiment, which operates beneath a mile of rock at the Sanford Underground Research Facility in the Black Hills of South Dakota, has completed its search for the missing matter of the universe.

Today at an international dark matter conference (IDM 2016) in Sheffield, UK, LUX scientific collaborators presented the results from the detector’s final 20-month run from October 2014 to May 2016. The new research result is also described with further details on the LUX Collaboration’s website.

LUX’s sensitivity far exceeded the original expectations of the experiment, collaboration scientists said, but yielded no trace of a dark matter particle. LUX’s extreme sensitivity makes the team confident that if dark matter particles had interacted with the LUX’s xenon target, the detector would almost certainly have seen them. These new limits on dark matter detection will allow scientists to eliminate many potential models for dark matter particles, offering critical guidance for the next generation of dark matter experiments.

“LUX has delivered the world’s best search sensitivity since its first run in 2013,” said Rick Gaitskell, professor of physics at Brown University and co-spokesperson for the LUX experiment. “With this final result from the 2014-2016 run, the scientists of the LUX Collaboration have pushed the sensitivity of the instrument to a final performance level that is 4 times better than originally expected. It would have been marvelous if the improved sensitivity had also delivered a clear dark matter signal. However, what we have observed is consistent with background alone.”

Dark matter is thought to account for more than four-fifths of …

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