The XENON1t excess Electron-recoil Events

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• Guido Zavattini (Ferrara INFN)
• Wednesday 21 October 2020, 13:30-14:30
• Zoom.

If you have a question about this talk, please contact Prof Ian Kenyon.

The XENON1T was designed to measure nuclear recoil events induced in the interaction of dark-matter particles coming from our galaxy. The detector is based on a dual-phase time projection chamber (TPC) with a ≈ 1 ton fiducial mass of liquid xenon in the target. Due to its large mass and ultra-low background, electron recoil event rates were also studied expanding the physics reach. In this talk, I will begin by briefly introducing the detector and its working principle. Interestingly, an excess electron recoil event rate above background is observed below 7 keV with a maximum deviation between 2–3 keV. I will describe possibile explanations of this excess rate both from known physics and from searches for new physics. The experiment is being upgraded to XENO NnT with a target volume of ≈ 6 tons, a fuducial mass of ≈ 3 tons and a designed 6-fold lower electron recoil background. XENO NnT should allow discriminating between the new physics scenario of the excess events and just unexplained background.

This talk is part of the Particle Physics Seminars series.

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• Bham Talks
• Particle Physics Seminars
• What's on in Physics?
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