Abstract
We report the measurement of muon neutrino charged-current interactions on carbon without pions in the final state at the T2K beam energy using 5.734$\times10^{20}$ protons on target. For the first time the measurement is reported as a flux-integrated, double-differential cross-section in muon kinematic variables ($\cos\theta_\mu$, $p_\mu$), without correcting for events where a pion is produced and then absorbed by final state interactions. Two analyses are performed with different selections, background evaluations and cross-section extraction methods to demonstrate the robustness of the results against biases due to model-dependent assumptions. The measurements compare favorably with recent models which include nucleon-nucleon correlations but, given the present precision, the measurement does not solve the degeneracy between different models. The data also agree with Monte Carlo simulations which use effective parameters that are tuned to external data to describe the nuclear effects. The total cross-section in the full phase space is $\sigma = (0.417 \pm 0.047 \text{(syst)} \pm 0.005 \text{(stat)})\times 10^{-38} \text{cm}^2$ $\text{nucleon}^{-1}$ and the cross-section integrated in the region of phase space with largest efficiency and best signal-over-background ratio ($\cos\theta_\mu>0.6$ and $p_\mu > 200$ MeV) is $\sigma = (0.202 \pm 0.0359 \text{(syst)} \pm 0.0026 \text{(stat)}) \times 10^{-38} \text{cm}^2$ $\text{nucleon}^{-1}$.
Highlights
Accelerator-driven neutrino oscillation measurements [1,2,3] make use of neutrino beams with energies of a few GeV or lower, at which one of the main interaction processes of neutrinos with nuclei is the charged current quasielastic scattering (CCQE) process
When considering the full phase space the results agree well with those in Analysis I; they suffer from large uncertainties that arise from extrapolating beyond the visible phase space
We find that predictions from these new models agree with the data; in particular, the data suggest the presence of 2p2h with respect to pure CCQE predictions with the random phase approximation (RPA)
Summary
Accelerator-driven neutrino oscillation measurements [1,2,3] make use of neutrino beams with energies of a few GeV or lower, at which one of the main interaction processes of neutrinos with nuclei is the charged current quasielastic scattering (CCQE) process In this process, a muon neutrino (νμ) interacts with a neutron n to produce a muon and a proton p through the exchange of a W boson (νμ þ n → μ− þ p). A muon neutrino (νμ) interacts with a neutron n to produce a muon and a proton p through the exchange of a W boson (νμ þ n → μ− þ p) This interaction is exploited in longbaseline neutrino oscillation experiments for the signal events with which to measure the neutrino appearance and disappearance probabilities as a function of neutrino energy.
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