First T2K measurement of transverse kinematic imbalance in the muon-neutrino charged-current single-π+ production channel containing at least one proton

This paper reports the first T2K measurement of the transverse kinematic imbalance in the single-π+ production channel of neutrino interactions. We measure the differential cross sections in the muon-neutrino charged-current interaction on hydrocarbon with a single-π+ and at least one proton in the final state, at the ND280 off-axis near detector of the T2K experiment. The extracted cross sections are compared to the predictions from different neutrino-nucleus interaction event generators. Overall, the results show a preference for models which have a more realistic treatment of nuclear medium effects including the initial nuclear state and final-state interactions.

• DOI: https://doi.org/10.1103/PhysRevD.103.112009, https://doi.org/10.1103/PhysRevD.103.112009
• arXiv preprint: https://arxiv.org/abs/2102.03346
• Reference: Phys.Rev.D 103 (2021) 11, 112009
• Data release: https://t2k-experiment.org/results/2021_tki_numucc1pinp/