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SUMMARY:A mass-sensitive criterion for SPHERE-3: dependence on atmospheric
  and hadronic interaction models
DTSTART;VALUE=DATE-TIME:20261030T154500Z
DTEND;VALUE=DATE-TIME:20261030T160000Z
DTSTAMP;VALUE=DATE-TIME:20261029T094849Z
UID:indico-contribution-6223@cern.ch
DESCRIPTION:Speakers: Vladimir Ivanov (SINP MSU)\nThe SPHERE-3 experiment 
 is being developed to study the mass composition of primary cosmic rays us
 ing Cherenkov light from extensive air showers reflected from the snow sur
 face. The lateral distribution of this light carries information about the
  primary mass\, but its interpretation depends on the atmospheric profile 
 and the hadronic interaction model used in shower simulations.\n\nWe prese
 nt a physically interpretable mass-sensitive criterion based on ratios of 
 Cherenkov light integrated over radial regions of the reconstructed latera
 l distribution. A Fisher discriminant combines several radial ratios while
  retaining their connection to the spatial distribution of light. The appr
 oach is studied using simulated proton\, nitrogen\, and iron showers\, wit
 h the telescope response included\, and evaluated through pairwise mass se
 paration.\n\nBuilding on this analysis\, we outline a comparative study of
  atmospheric and hadronic interaction models. The planned comparison will 
 examine shifts in the criterion distributions and changes in mass-separati
 on performance under different simulation assumptions. Applying a criterio
 n calibrated with one model to samples generated with another will allow i
 ts transferability to be assessed. This study aims to quantify the sensiti
 vity of the criterion to modelling choices and to identify the systematic 
 effects that must be considered when using reflected Cherenkov light to in
 fer cosmic-ray mass composition.\n\nhttps://indico.particle.mephi.ru/event
 /626/contributions/6223/
LOCATION: Conference Hall 4
URL:https://indico.particle.mephi.ru/event/626/contributions/6223/
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