NuIntBibby César Jesús Valls
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T2K · 2025

Signal selection and model-independent extraction of the neutrino neutral-current single π+ cross section with the T2K experiment

Phys.Rev.D 112 72008 · 10.1103/wcn1-4tyl

arXiv:2503.06843JournalINSPIREAll papers

Measurements

CurrentFlavorTargetTopologyTypeObservablesEnergy
NCνμCHNC1π+totalmodel-independent NC1pi+ cross-section extractionsub-GeV (T2K ND280)

Abstract

This article presents a study of single π+π^+ production in neutrino neutral-current interactions (NC1π+π^+) using the FGD1 hydrocarbon target of the ND280 detector of the T2K experiment. We report the largest sample of such events selected by any experiment, providing the first new data for this channel in over four decades and the first using a sub-GeV neutrino flux. The signal selection strategy and its performance are detailed together with validations of a robust cross section extraction methodology. The measured flux-averaged integrated cross-section is σ=(6.07±1.22)×10−41  cm2/nucleon σ= (6.07 \pm 1.22 )\times 10^{-41} \,\, \text{cm}^2/\text{nucleon}, 1.3~σ σ~ above the NEUT v5.4.0 expectation.

Citation

@article{T2K:2025kdk,
  collaboration = "T2K",
  title = "{Signal selection and model-independent extraction of the neutrino neutral-current single <math display="inline"><msup><mi>π</mi><mo>+</mo></msup></math> cross section with the T2K experiment}",
  eprint = "2503.06843",
  doi = "10.1103/wcn1-4tyl",
  journal = "Phys.Rev.D",
  volume = "112",
  pages = "72008",
  year = "2025",
}