Abstract
We present the updated measurement of the muon neutrino interaction rates and spectrum at the T2K near detector complex, ND280, located at the JPARC accelerator facility in Tokai, Japan, 280 meters downstream from the target. The measurements are obtained using all the data collected until 2014. The momentum-angle spectrum of muons from νμ charged current (CC) interactions measured at ND280 off-axis detector constrains the flux and cross-section uncertainties in the T2K oscillation analysis. This spectrum was also used to measure a differential cross-section measurement of muon neutrinos on carbon. Similarly the νe contamination of the T2K beam was measured to verify this intrinsic background for the electron neutrino appearance and provide the first electron neutrino cross-section result since the Gargamelle experiment. The νμ CC inclusive events selected in the on-axis detector (INGRID) at 280 m and originally used for monitoring the T2K beam stability were also used to measure the CC interaction cross sections on carbon and iron. The selections and results for both ND280 and INGRID will be presented in this paper as well as future prospects for both detectors.
Highlights
The discovery of neutrino oscillation has marked the beginning of a new era for neutrino physics focussed on the determination of the mixing angles of the PMNS mixing matrix and the neutrino mass differences
Primarily designed to observe neutrino oscillation, the near detectors of the T2K experiment can contribute to this experimental effort in particular because they are composed of multiple detectors offering multiple nuclear targets located at different energies in the T2K neutrino beam
A second analysis using only the proton module focusses on the charged current quasi-elastic (CCQE) channel in which the neutrino interacts with a neutron of the target and a muon is emitted, sometimes accompanied by a proton
Summary
The discovery of neutrino oscillation has marked the beginning of a new era for neutrino physics focussed on the determination of the mixing angles of the PMNS mixing matrix and the neutrino mass differences. Recently the θ13 angle was shown to be non-zero using anti-electron neutrino disappearance in Daya bay and RENO and from the first ever observation of electron neutrino appearance in T2K This marks the beginning of the search for the CP violation phase in the neutrino sector since θ13 has to be non-zero for the CP violation to be observable in neutrino oscillation. The precise measurement of the CP violation phase will require a new generation of long baseline experiments with increased beam power and well chosen baseline for optimal sensitivity. These experiments will need to achieve an unprecedented level of understanding of the neutrino beam flux and neutrino crosssection uncertainties. Primarily designed to observe neutrino oscillation, the near detectors of the T2K experiment can contribute to this experimental effort in particular because they are composed of multiple detectors offering multiple nuclear targets located at different energies in the T2K neutrino beam
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