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SUMMARY:Probing the Solar B8 Neutrino Fog with XENONnT
DTSTART;VALUE=DATE-TIME:20260603T020000Z
DTEND;VALUE=DATE-TIME:20260603T030000Z
DTSTAMP;VALUE=DATE-TIME:20260702T031700Z
UID:indico-event-5076@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Kexin Liu（刘可欣） (Tsinghua University)\n\nAb
 stract:XENONnT is a dual-phase liquid xenon time projection chamber operat
 ing at LNGS with a 5.9-tonne active target\, designed to search for weakly
  interacting massive particles (WIMPs). As its sensitivity reaches the irr
 educible background from solar neutrino coherent scattering\, the experime
 nt enters a new regime — the "neutrino fog" — where neutrino and dark 
 matter signals become increasingly difficult to disentangle.We report a 3.
 3σ measurement of coherent elastic neutrino-nucleus scattering (CEνNS) f
 rom solar ⁸B neutrinos using a combined exposure of 6.77 t×yr across th
 ree science runs. The inferred ⁸B flux of (5−2+3)×10⁶ cm⁻²s⁻¹
  is consistent with the Standard Solar Model. In the presence of this neut
 rino fog\, a search for light dark matter finds no signal excess\, and a n
 ear-doubling of exposure improves the median sensitivity to 5 GeV/c² WIMP
 s by only ~10%\, providing a direct experimental demonstration of diminish
 ing returns.The dataset is further used to measure the weak mixing angle s
 in2θW at ~0.02 GeV/c momentum transfer and to constrain new vector mediat
 ors and the neutrino magnetic moment\, highlighting the versatility of the
  liquid xenon TPC as a precision probe of both neutrino physics and physic
 s beyond the Standard Model.Biography:Kexin Liu is a PhD candidate in the 
 Department of Physics at Tsinghua University\, supported by the Tsinghua U
 niversity "Future Scholar" Fellowship. She is a member of the XENON Collab
 oration and former subgroup leader of the "Signal and Detector Physics" an
 alysis group. She served as one of the lead analysts for the solar ⁸B ne
 utrino signal physics analysis in XENONnT\, responsible for the suppressio
 n\, modeling\, and validation of the dominant accidental coincidence backg
 round\, and is a corresponding author of the publication. Her work on sola
 r neutrino physics analysis was recognized with the National Scholarship f
 or Graduate Students\, the Best Oral Presentation Award in the Direct Dete
 ction Experimental category at IDM 2024\, and the Chien-Shiung Wu Diploma 
 at ISSP 2025.Alternatively online link:https://meeting.tencent.com/dm/ydFj
 mub7SnMoID：838-498-931 \n\nhttps://indico-tdli.sjtu.edu.cn/event/5076/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5076/
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