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SUMMARY:TPC Particle Identification Performance and Systematic Uncertainti
 es in the T2K Near Detector Before and After the Upgrade
DTSTART;VALUE=DATE-TIME:20261028T064500Z
DTEND;VALUE=DATE-TIME:20261028T070000Z
DTSTAMP;VALUE=DATE-TIME:20261102T180254Z
UID:indico-contribution-6235@cern.ch
DESCRIPTION:Speakers: Anna Dergacheva (INR RAS)\nT2K (Tokai-to-Kamioka) [1
 ] is a long-baseline accelerator experiment aimed at studying neutrino osc
 illations and searching for CP violation in the lepton sector. Reducing sy
 stematic uncertainties in the predicted event rates at the far detector Su
 per-Kamiokande is essential for improving T2K’s sensitivity to the CP-vi
 olating phase. The ND280 near detector plays a key role in this task by co
 nstraining neutrino flux and interaction model parameters using pre-oscill
 ation data. The time projection chambers (TPCs) [2] provide key informatio
 n for particle identification (PID) and the reconstruction of charged part
 icle kinematics in ND280. The ND280 upgrade [3] introduced two high-angle 
 TPCs (HA-TPCs)\, which\, together with the three existing vertical TPCs\, 
 provide an extended angular acceptance for charged particles. \n\nThe TPC 
 PID algorithm [4] is based on measurements of the ionization energy loss o
 f charged particles traversing the TPC gas. The performance of the algor
 ithm and associated systematic uncertainties are evaluated using control s
 amples of muons\, protons\, and electrons produced in neutrino interaction
 s. The work focuses on the studies of the TPC PID before and after the ND2
 80 upgrade\, as well as on the impact of the results and evaluated systema
 tics on muon-candidate selection using the ND280 near detector data. This 
 work is supported by Russian Science Foundation grant No. 26-72-00042.\n\n
 [1] K. Abe et al. (T2K Collab.). Constraint on the matter-antimatter symme
 try-violating phase in neutrino oscillations\, Nature 580 (2020) 339–344
 . \n\n[2] N. Abgrall et al. (T2K ND280 TPC Collab.). Time Projection Cha
 mbers for the T2K Near Detectors\, Nucl. Instrum. Meth. A 637 (2011) 25–
 46.\n\n[3] K. Abe et al. (T2K Collab.). T2K ND280 Upgrade — Technical De
 sign Report\, arXiv:1901.03750 [physics.ins-det] (2019).\n\n[4] A. Dergach
 eva and A. Izmaylov. Evaluation of uncertainties associated with particle 
 identification in the time projection chambers of the ND280 near detector 
 of the T2K experiment\, Physics of Atomic Nuclei 89\, 4 (2026).\n\nhttps:/
 /indico.particle.mephi.ru/event/626/contributions/6235/
LOCATION: Conference Hall 4
URL:https://indico.particle.mephi.ru/event/626/contributions/6235/
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