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Speaker: Ibles Olcina Samblas (LBNL) – Title: New constraints on WIMP dark matter from the LUX-ZEPLIN (LZ) experiment
October 10 @ 4:00 pm - 5:00 pm
Research Progress Meeting
Date: October 10, 2024
Time: 4:00- 5:00 pm
Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]
Speaker: Ibles Olcina Samblas (LBNL)
Title: New constraints on WIMP dark matter from the LUX-ZEPLIN (LZ) experiment
Abstract: Dark matter detection experiments based on liquid xenon time projection chambers (TPC) have been steadily increasing in sensitivity to the weakly interacting massive particle (WIMP) over the past two decades. The LUX-ZEPLIN (LZ) experiment, employing a two-phase xenon TPC containing 7 tonnes of liquid xenon, leads the way. Recently, the collaboration released new results from a combined analysis using data from the 2022 and 2024 science campaigns, amounting to an exposure of 4.2 tonne-years. No evidence for an excess over expected backgrounds was found across all the test WIMP masses. The resulting limit on the spin-independent WIMP-nucleon cross section is world-leading for masses above 9 GeV/c2, surpassing previous best limits by about a factor of four. In this talk, I will describe the new LZ results—including a new technique to actively tag background electronic recoils from Pb-214 beta decays, the observation of charge-suppressed two-neutrino double electron capture events from Xe-124 decays, and the bias mitigation technique called “salting”—and briefly discuss what is on the horizon for the liquid xenon TPC community.
Join Zoom Meeting
https://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09
Meeting ID: 988 5432 2464
Passcode: 142239