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SUMMARY:Light yield correction in the 3D-segmented SuperFGD neutrino detec
 tor
DTSTART;VALUE=DATE-TIME:20261030T152000Z
DTEND;VALUE=DATE-TIME:20261030T153500Z
DTSTAMP;VALUE=DATE-TIME:20261025T164817Z
UID:indico-contribution-6343@cern.ch
DESCRIPTION:Speakers: Viktor Prutyanov (INR RAS)\nSuperFGD [1] is a highly
  segmented scintillator neutrino target with a three-dimensional structure
  comprising nearly two million scintillator cubes\, each 1 cm on a side. I
 t is currently operating as part of the upgraded ND280 near detector [2] a
 nd is collecting data from the T2K neutrino beam [3]. Scintillation photon
 s produced when a charged particle passes through a scintillator cube are 
 captured by three mutually orthogonal Kuraray Y-11(200) wavelength-shiftin
 g (WLS) fibers and subsequently detected by Hamamatsu S13360-1325PE Multi-
 Pixel Photon Counters (MPPCs).\n\nTo ensure a uniform detector response\, 
 the signal correction must account for attenuation along the WLS fibers as
  a function of the distance from the scintillator cube to the MPPC\, as we
 ll as for the light-yield (LY) response of individual cubes. For the horiz
 ontal X- and Z-oriented fibers\, this distance dependence is determined us
 ing cosmic-muon data. Since cosmic muons predominantly traverse SuperFGD a
 long directions close to the vertical axis\, their projections onto the ho
 rizontal XZ plane are too short to provide sufficient information for cali
 brating the vertical Y-oriented fibers. Therefore\, muons produced in inte
 ractions of T2K beam neutrinos are used for this purpose. The Y-fiber cali
 bration sample consists predominantly of sand muons produced in neutrino i
 nteractions in the rock surrounding the detector. Muon candidates are sele
 cted using TPC and HA-TPC tracking and particle-identification information
 . The selection requires a high-quality track that crosses SuperFGD and or
 iginates outside the detector\; the muon momentum is reconstructed using t
 he TPC. Muons and stopping protons are also employed to estimate the linea
 rity of the relationship between the cube LY and the track chord length wi
 thin the cube.\n\nThis work is supported by Russian Science Foundation gra
 nt No. 26-72-00042.\n\n[1] S. Abe et al. (T2K Collab.). The super fine-gra
 ined detector for the T2K neutrino oscillation experiment\, Nucl. Instrum.
  Meth. A 1092 (2026) 171882.\n\n[2] N. Skrobova. The Upgrade of the T2K Ne
 ar Detector\, Springer Proc. Phys. 425 (2025) 49-53.\n\n[3] K. Abe et al. 
 (T2K Collab.). Constraint on the matter-antimatter symmetry-violating phas
 e in neutrino oscillations\, Nature 580 (2020) 339–344.\n\nhttps://indic
 o.particle.mephi.ru/event/626/contributions/6343/
LOCATION: Conference Hall 2
URL:https://indico.particle.mephi.ru/event/626/contributions/6343/
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