Commissioning and Performance of the Time-of-Flight Detector for the T2K Neutrino Oscillation Experiment

Rapport Preprint Commissioning and Performance of the Time-of-Flight Detector for the T2K Neutrino Oscillation Experiment eng 2026-09-17 2026-09-17 author Alt C. author Amziane Lounes 446533 Département de physique nucléaire et corpusculaire (FINUC) author Baudis N. author Blanchet Adrien 406927 author Bordoni Stefania 947940 author Bui T. H. author Cadoux Franck 676514 Département de physique nucléaire et corpusculaire (FINUC) author Collard P. author El Baz Mathias 959721 Département de physique nucléaire et corpusculaire (FINUC) author Favre Yannick 761433 Département de physique nucléaire et corpusculaire (FINUC) author Giannessi Lorenzo 0000-0001-6899-7116 985006 author Ha G. author Jesús-Valls C. author Kasturi Vedantha Srinivas 937020 Département de physique nucléaire et corpusculaire (FINUC) author Klustová A. author Korzenev Alexander 713449 author Le T. A. author Lux T. author Nguyen A. D. author Nguyen D. T. author Nguyen H. author Samani Soniya 419357 Département de physique nucléaire et corpusculaire (FINUC) author Sanchez Nieto Federico 0000-0003-0320-3623 909827 Département de physique nucléaire et corpusculaire (FINUC) author Ta M. author Thaiduc T. author Villa Emanuele 0000-0002-3608-9022 983992 39 10.48550/arxiv.2609.20117 The T2K ND280 Upgrade aims to reduce systematic uncertainties in measurements of neutrino oscillation parameters and improve sensitivity to the charge-parity (CP)-violating phase, $δ_{\mathrm{CP}}$. A key component is the Time-of-Flight (ToF) detector, comprising six panels with 118 EJ-200 plastic-scintillator bars surrounding the Super Fine-Grained Detector (SuperFGD) and two High-Angle Time Projection Chambers (HA-TPCs). Each bar is read out at both ends by silicon photomultiplier arrays and digitised using SAMPIC waveform electronics. The ToF provides precise timing and particle-direction information for particle identification and rejection of backgrounds entering the tracker from outside. This article presents the detector design, construction, signal reconstruction, integration, commissioning, and performance. Dedicated single-bar measurements achieve a time resolution of approximately 130 ps and a longitudinal position resolution of 2.6 cm. After installation in ND280, cosmic-ray calibration yields an in situ single-bar time resolution of $169 \pm 1$ ps for Top-Bottom crossing events. Beam data clearly resolve the eight-bunch T2K spill structure, confirming synchronisation with the ND280 trigger and data-acquisition systems. The ToF has been successfully commissioned and operates stably within the upgraded ND280 detector. FOS: Physical sciences High Energy Physics - Experiment (hep-ex) Instrumentation and Detectors (physics.ins-det) Dewey 500.2 34 Département de physique nucléaire et corpusculaire 132 false e27ddb89-c6e0-4a8d-9fba-14be591108d0 Preprint Public Preprint_from_arxiv.pdf 32620566 application/pdf 891ccf4d0fa736424a49cd74831267ef14998e762fa38522a08e035d8d5cc44e openAccess Faculté des sciences / Section de physique / Département de physique nucléaire et corpusculaire

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Commissioning and Performance of the Time-of-Flight Detector for the T2K Neutrino Oscillation Experiment				2026	1	0

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