Expanding T2K near detector fit by adding proton information
March 31, 2022
T2K (Tokai to Kamioka) is a long-baseline neutrino oscillation experiment located in Japan. One of the most challenging tasks of T2K is to determine whether CP is violated in the lepton sector, which is suggested by recent T2K results. By utilizing the near detector (ND280) data, T2K can constrain neutrino interaction and flux uncertainties by fitting a parameterized model to data. This allows for a significant reduction of the systematic uncertainties in neutrino oscillation analyses. The fit to ND280 data currently uses several samples which are based on muon kinematics and pion multiplicity. There is ongoing work to expand these samples by incorporating the reconstructed proton multiplicity in order to enhance ND280 sensitivity to neutrino cross-section modelling that drive current systematic uncertainties. The poster presents the properties of new ND280 samples and how they enhance the sensitivities to nuclear effects that are dominant at the energy range relevant for T2K. The addition of the proton multiplicity information will also help to reduce systematic uncertainties that affect neutrino oscillation measurements at T2K.
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