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Abstract：
T2K is a long-baseline neutrino experiment in Japan that has been operated for 10 years, and is currently being upgraded with the neutrino beam production and detection techniques. Neutrino oscillation parameters are measured through the event rates of the neutrino spectra at the near and far detectors. The major signal at the far detector comes from charged-current (CC) interactions, produces electron-like or muon-like Cherenkov rings in water. However, the event identification can be affected if the rings produced by decayed photons or leptons from neutrino-nucleus interactions rather than the primary CC interaction leptons, and will make the reconstruction of CC events difficult.
The 1-ring neutral current (NC) 1pi0 events can contribute as a background in the oscillated electron neutrino sample. The current selection shows a fraction of the CCQE electron-like events are miss-identified as NC1pi0 interactions in the oscillation analysis, in which adding the 1-ring NC1pi0 sample can thus improve the oscillated electron neutrino event rate. A high purity (>76%) and efficiency (>72%) 2-ring NC1pi0 selection is available to help understand pi0 interaction cross sections and kinematics and better constrain the 1-ring NC1pi0 events. Studies are performed based on the kinematic properties of both samples and implementation to the oscillation analysis framework.
Biography：
Tailin Zhu is a PhD student at Imperial College London. Her work is focused on improving the oscillation analysis for the long baseline neutrino experiments. She started from the simulation, calibration and DAQ maintenance work for the neutrino beam profile monitoring at J-PARC. At the mean time, she gradually moved onto neutrino oscillation analysis for Hyper-K and T2K by implementing new features on the sample selection and systematic parameters to the analysis. She is now approaching the final thesis timeline by accumulating her analysis towards an improvement on the neutrino oscillation sensitivity for T2K.
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