An experiment at the world’s biggest dark-matter detector—a behemoth in the U.S. known as LUX-ZEPLIN—leads a three-way race to find WIMP particles.
or WIMPs. Still, the result is sparking interest among particle physicists, as the nearly 4-decade-long search for WIMPs approaches a climax. The U.S. detector is turning on at the same time as similar detectors in Italy and China, and together they likely represent the next to last generation of WIMP detectors, if not the last.
Dark matter is thought to account for 85% of all matter. Astronomical observations show, for example, that the stars in a typical galaxy swirl so fast that their collective gravity isn’t enough to keep them from flying into space. So physicists assume that some sort of invisible dark matter—presumably, a new particle—provides the extra gravity needed to rein in the stars.
LZ’s central tank contains 7 metric tons of liquid xenon hunkering 1480 meters down in the Sanford Underground Research Facility, in an abandoned gold mine near Lead, South Dakota. LZ researchers do see 335 nuclear recoil events in their detector, Hugh Lippincott, a physicist at the University of California, Santa Barbara, and spokesperson for the 287-member LZ team, reported today in an online seminar.
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