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SUMMARY:Quantum Mechanical Numerical Model of XHe–Nucleus Interaction an
 d Direct Dark Matter Searches
DTSTART;VALUE=DATE-TIME:20261029T071500Z
DTEND;VALUE=DATE-TIME:20261029T073000Z
DTSTAMP;VALUE=DATE-TIME:20261027T065557Z
UID:indico-contribution-6187@cern.ch
DESCRIPTION:Speakers: Timur Bikbaev (National Research Nuclear University 
 MEPhI (Moscow Engineering Physics Institute)\; Research Institute of Physi
 cs\, Southern Federal University)\nWhile Standard Model extensions such as
  Supersymmetry have long provided promising candidates\, the absence of su
 persymmetric particle signals at the LHC and contradictory results from di
 rect detection experiments motivate exploration of alternative scenarios. 
 The hypothesis of composite dark atoms — electrically neutral atom-like 
 bound states formed by stable doubly negatively charged particles with pri
 mordial helium nuclei — offers a promising framework to address the chal
 lenges in direct dark matter detection. We present self-consistent quantum
 -mechanical numerical model for describing the three-body interaction betw
 een X-helium (XHe) dark atoms and nuclei of ordinary matter\, bridging cos
 moparticle physics\, nuclear physics\, and experimental dark matter search
 es. The methodology incorporates nuclear\, Coulomb\, centrifugal\, and Sta
 rk interaction potentials\, enabling precise reconstruction of the effecti
 ve interaction potential for XHe with sodium and iodine nuclei. Our result
 s reveal a crucial selectivity: while the effective potential for sodium s
 upports the radiative capture of the sodium nucleus by the dark atom into 
 a single low-energy bound state with binding energy in the 1–6 keV range
 \, consistent with the DAMA/LIBRA annual modulation signal\, the correspon
 ding radiative capture rates for iodine are substantially suppressed. This
  selectivity of modulation signal generation in the detector depending on 
 the target nucleus naturally explains the observed signal in NaI detectors
  and its absence in experiments using heavier target nuclei\, while satisf
 ying experimental constraints on high-energy gamma emission. The results o
 btained validate the dark atom hypothesis as a coherent resolution to long
 -standing puzzles in dark matter direct searches. The developed model esta
 blishes a framework for interpreting experimental results and for future i
 nvestigations of composite dark matter candidates.\n\nhttps://indico.parti
 cle.mephi.ru/event/626/contributions/6187/
LOCATION: Conference Hall 2
URL:https://indico.particle.mephi.ru/event/626/contributions/6187/
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