Abstract
This paper reports the first differential measurement of the charged-current $\overline{\nu}_{\mu}$ interaction cross section on water with no pions in the final state. The unfolded flux-averaged measurement using the T2K off-axis near detector is given in double differential bins of $\mu^+$ momentum and angle. The integrated cross section in a restricted phase space is $\sigma=\left(1.11\pm0.18\right)\times10^{-38}$ cm$^{2}$ per water molecule. Comparisons with several nuclear models are also presented.
Highlights
Long-baseline neutrino experiments [1,2] are measuring both neutrino and antineutrino appearance oscillations to determine fundamental neutrino mixing parameters and to search for charge-parity (CP) violation in the lepton sector
In an idealized experiment with no backgrounds and perfect detector resolutions, the differential cross section as a function of the kinematic variable x in a particular bin j is denoted as Δxj and the cross section is given as dσ dxj where Nj is the number of measured events in bin j, T is the number of target nuclei, Φ is the neutrino flux per unit area, and εj is the efficiency to reconstruct a signal event in bin j
We have performed a measurement of the νμ CC doubledifferential cross section on water without pions in the final state averaged over the T2K antineutrino beam flux
Summary
Long-baseline neutrino experiments [1,2] are measuring both neutrino (νμ → νe) and antineutrino (νμ → νe) appearance oscillations to determine fundamental neutrino mixing parameters and to search for charge-parity (CP) violation in the lepton sector. Testing this symmetry may answer one of the most fundamental physics questions: the mystery of the matter-antimatter imbalance in our Universe. A key component required by present and future [5,25] experiments are the precise measurements and tests of theoretical models of both neutrino and antineutrino cross sections on detector target materials, such as scintillator, water, and liquid argon. We describe the T2K anti-neutrino beam and near detector (ND280), the Monte Carlo simulation and data samples, the event selection, the cross section extraction method, the results, and model comparisons
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