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SUMMARY:Seminar - Prof. Seodong Shin (Jeonbuk Natl. U.)
DTSTART:20260921T080000Z
DTEND:20260921T090000Z
DTSTAMP:20260922T050200Z
UID:indico-event-14@ihepco.yonsei.ac.kr
DESCRIPTION:Title :  High-Energy Nuclear Recoils from Boosted Dark Matter
  for the LZ 248-keV Event: Beyond the Halo-Dependent High-Velocity Tail\nA
 bstract:\n\nThe LUX-ZEPLIN (LZ) Collaboration has reported a nuclear-recoi
 l candidate at ER = 248 ± 23stat ± 23sys keV\, with a maximum local sign
 ificance of 3.4σ and a global significance of 2.6σ. A prominent interpre
 tation invokes heavy halo dark matter near an inelastic threshold and ther
 efore depends sensitively on the poorly constrained high-speed tail of the
  Galactic velocity distribution. In this Letter\, we propose a qualitative
 ly different possibility based on light boosted dark matter (BDM)\, whose 
 incident energy is determined primarily by the dark-sector mass spectrum. 
 We con- sider multi-component scenarios in which the boosted state scatter
 s elastically or inelastically off xenon nuclei. For elastic scattering\, 
 pseudoscalar-mediated momentum dependence suppresses low- energy recoils. 
 Near-threshold endothermic scattering of a nearly monochromatic BDM flux c
 an instead confine the signal between kinematically determined recoil endp
 oints\, suppressing events in both the low- and high-energy sidebands. The
  upscattered state may furthermore decay in- visibly within the dark secto
 r\, preserving a single-nuclear-recoil signature without requiring it to b
 e detector-stable. We present representative benchmark spectra and discuss
  complementary tests using other target nuclei and large-volume liquid-sci
 ntillator experiments.\n\n \nPaper : https://arxiv.org/pdf/2609.06890v1\n
 \nhttps://ihepco.yonsei.ac.kr/event/14/
LOCATION:Yonsei University (S327)
URL:https://ihepco.yonsei.ac.kr/event/14/
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