Home Physics The Seek for WIMPs Continues

The Seek for WIMPs Continues

The Seek for WIMPs Continues


• Physics 16, s106

Two mammoth underground detectors have delivered extra stringent higher limits on how strongly a putative darkish matter candidate interacts with regular matter.

Lawrence Berkeley Nationwide Laboratory

Among the many hypothetical particles proposed to elucidate darkish matter are weakly interacting huge particles (WIMPs). In response to fashions, WIMPs and their antiparticles fell out of thermal equilibrium quickly after the massive bang and ceased being spontaneously produced. The fraction that survived self-annihilation lived on. Two groups, LUX ZEPLIN and XENONnT, have simply reported the primary outcomes of their searches for WIMPs whose lots exceed the proton’s by an element of 10 and extra, a spread that’s in keeping with fashions of cosmic evolution [1, 2]. Neither workforce recorded a detection. Nonetheless, their constraints of their overlapping mass ranges are probably the most stringent but.

The LUX ZEPLIN and XENONnT experiments each encompass a number of tons of liquid xenon contained in a tank and monitored by two arrays of photomultiplier tubes. These arrays file the attribute double mild flash of WIMPs putting xenon atoms. The ratio of the 2 flashes could be completely different for cosmic rays, muons, or different background particles. To scale back background charges, LUX ZEPLIN and XENONnT are positioned in deep underground caverns.

WIMPs are available in a number of varieties arising from the theories that begat them. The brand new limits from LUX ZEPLIN and XENONnT don’t eradicate any of the favored varieties. Nonetheless, the 2 experiments have years extra to run. Already, the higher restrict on the WIMP–nucleon interplay cross part is one tenth that of the neutrino–nucleon equal.

–Charles Day

Charles Day is a Senior Editor for Physics Journal.


  1. E. Aprile et al. (XENON Collaboration), “First darkish matter search with nuclear recoils from the XENONnT experiment,” Phys. Rev. Lett. 131, 041003 (2023).
  2. J. Aalbers et al. (LUX-ZEPLIN Collaboration), “First darkish matter search outcomes from the LUX-ZEPLIN (LZ) experiment,” Phys. Rev. Lett. 131, 041002 (2023).

Topic Areas

Particles and FieldsAstrophysics

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