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SUMMARY:Intrinsic energy resolution of the liquid argon scintillation sign
 al
DTSTART;VALUE=DATE-TIME:20261030T150500Z
DTEND;VALUE=DATE-TIME:20261030T152000Z
DTSTAMP;VALUE=DATE-TIME:20261026T183733Z
UID:indico-contribution-6335@cern.ch
DESCRIPTION:Speakers: Olga Lychagina (JINR)\nLiquid argon (LAr) detectors 
 are widely used in modern astroparticle and neutrino physics\, with experi
 ments such as DarkSide-20k\, DEAP-3600\, and DUNE relying on their scintil
 lation response. A precise characterisation of the energy resolution is es
 sential for optimising the sensitivity of these experiments to rare events
 \, improving neutrino energy reconstruction\, and lowering detection thres
 holds.\n\nIn organic and inorganic scintillators\, a contribution to the e
 nergy resolution is observed that cannot be described by photoelectron sta
 tistics\, PMT response\, or light collection non-uniformities\, and is ref
 erred to as the intrinsic resolution of the scintillation medium. In this 
 work\, we test whether a similar contribution is present in the energy res
 olution of the liquid argon scintillation signal. Using a phenomenological
  model that separates independent fluctuation sources\, we extract an effe
 ctive parameter that characterises the intrinsic resolution at 1 MeV from 
 three independent datasets. Afterpulses falling within the PMT signal wind
 ow are not accounted for in the statistical term extracted from PMT calibr
 ations performed in a short window\, and must therefore be added explicitl
 y. Together with the fluctuations due to photon re-emission at the TPB wav
 elength shifter\, these contributions fully account for the extracted para
 meter: after their subtraction\, effective parameter is compatible with ze
 ro\, and no additional intrinsic component is needed.\n\nThis result holds
  consistently across all three datasets. It indicates that the measured en
 ergy resolution of LAr scintillation detectors can be described by these c
 ontributions alone\, without invoking an intrinsic resolution of the scint
 illation medium itself\, in contrast to what is observed in organic and in
 organic scintillators. The fluctuations due to photon re-emission at the T
 PB wavelength shifter may\, in turn\, provide a key to understanding the l
 ine-broadening mechanism observed in organic scintillators. These findings
  have direct implications for the interpretation of the energy resolution 
 in large-scale LAr detectors with light yields of several thousand p.e./Me
 V.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6335/
LOCATION: Conference Hall 2
URL:https://indico.particle.mephi.ru/event/626/contributions/6335/
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