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SUMMARY:ELECTRON DETECTION IN THE SEGMENTED NEUTRINO DETECTOR SUPERFGD
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261103T212836Z
UID:indico-contribution-6443@cern.ch
DESCRIPTION:Speakers: Alexander  Polyakov ()\nElectron neutrinos in the T2
 K experiment are detected through the particles produced when they interac
 t with matter. Charged-current interactions produce an electron\, which lo
 ses energy through ionization and bremsstrahlung. This work studies the si
 mulated energy deposition of this electron in SuperFGD\, the three-dimensi
 onally segmented scintillator detector of the ND280 complex\, and examines
  the photon background.\n\nA sample of 10\,000 primary electrons with kine
 tic energies from 5 to 300 MeV was studied using Geant4. Energy deposits 
 from the primary electron and its associated secondary particles are summe
 d without double counting. The response is defined as the deposited energy
 \, corrected for rest-mass energy\, divided by the electron's initial kine
 tic energy.\n\nWhen the calculation is extended from the direct electron b
 ranch to the full cascade\, the mean response increases from 56.8% to 85.9
 %. Branches initiated by bremsstrahlung photons contribute about one third
  of the cascade's deposited energy on average. A primary electron stopping
  inside the detector does not ensure full energy containment: secondary ph
 otons can carry energy out of the active volume.\n\nPhoton conversion into
  an electron-positron pair was studied at photon energies of 50\, 100 and 
 200 MeV. Under the simulated conditions\, the fraction of photons convert
 ing inside SuperFGD increases from about 62% to 84% as the photon energy r
 ises from 50 to 200 MeV. The energy deposited by conversion pairs is simi
 lar to that deposited by electrons\, so electron-photon separation also re
 quires information on the spatial structure of the event.\n\nThese results
  provide a basis for further development of methods for electron energy re
 construction and electron neutrino event selection. The study describes en
 ergy deposition in the active material\; light collection\, electronics an
 d full neutrino event reconstruction were not included in this analysis.\n
 \nhttps://indico.particle.mephi.ru/event/626/contributions/6443/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6443/
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