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SUMMARY:A Surprising Result in the Search for Dark Matter in an Extended E
 nergy Window of LZ
DTSTART:20261019T164500Z
DTEND:20261019T174500Z
DTSTAMP:20261016T175100Z
UID:indico-event-1738337@indico.cern.ch
DESCRIPTION:Speakers: Matthew Szydagis (University at Albany)\n\nFor many 
 decades\, the tantalizing possibility of vast amounts of unseen matter in 
 the universe that interacts rarely with baryons and leptons has been an en
 during mystery in particle physics\, astronomy\, and cosmology\, which tog
 ether provide evidence this so-called dark matter is 25% of the total mass
 -energy content (85% of just the matter) of the cosmos. The Weakly Interac
 ting Massive Particle or WIMP is a popular dark matter candidate\, well mo
 tivated by theoretical physics through supersymmetry and other theories an
 d within cosmology through the concept of a thermal relic. Experiments lik
 e LUX-ZEPLIN (LZ) are attempts to directly detect a WIMP. LZ utilizes a ~5
 .5 tonne fiducial volume of liquid Xenon\, an element with many advantages
  in the search for WIMPs. Recently\, the LZ collaboration reported on the 
 results from an exposure of 220 live-days with the LZ detector in a nuclea
 r recoil energy window extending up to 270 keV\, instead of a traditional 
 value smaller by an order of magnitude. The larger window is motivated by 
 lack of discovery at lower energies\, but more importantly by effective fi
 eld theory (EFT) and inelastic models where high-energy recoils account fo
 r a larger fraction of the predicted recoil spectrum compared to the stan
 dard WIMP paradigm. We observed one event with characteristics consistent 
 with a nuclear recoil of 248 ± 23(stat.) ± 23(sys.) keV\, in a region of
  parameter space where no known background was likely to produce even a si
 ngle count. This result is in tension with the background-only hypothesis
  at a global significance of 2.6σ.\n\nhttps://indico.cern.ch/event/17383
 37/
LOCATION:D-122 (P. Grannis Seminar Room)
URL:https://indico.cern.ch/event/1738337/
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