Tomislav Vladisavljevic

arXiv2018

Constraining the T2K Neutrino Flux Prediction with 2009 NA61/SHINE Replica-Target Data

Accurate modelling of the T2K neutrino flux is crucial for a better understanding of neutrino interactions at the near and far detectors. Most of T2K neutrinos are created through in-flight decays of unstable hadrons, produced by interactions of 31 GeV/c protons in a long graphite target (90 cm). External hadron production data is used for correcting the flux model. The analysis presented here uses a new NA61 dataset, collected in 2009 using the full length replica of the T2K target. The preliminary results suggest a reduction of the hadronic interaction component of the neutrino flux uncertainty by ~50%, to errors of less than 5%.

physics.ins-det↗

arXiv2016

Probing Nuclear Effects at the T2K Near Detector Using Single-Transverse Kinematic Imbalance

In order to make precision measurements of neutrino oscillations using few-GeV neutrino beams a detailed understanding of nuclear effects in neutrino scattering is essential. Recent studies have revealed that single-transverse kinematic imbalance (STKI), defined in the plane transverse to an incoming neutrino beam, can act as a unique probe of these nuclear effects. This work first illustrates that an exclusive measurement of STKI at the off-axis near detector of the T2K experiment (ND280) is expected distinguish the presence of interactions with two nucleons producing two holes (2p-2h) from alterations of the predominant underlying cross-section parameter ($M_A$ - the nucleon axial mass). Such a measurement is then demonstrated with fake data, showing substantial nuclear model separation potential.

hep-ex↗