Abstract
We calculate the charged-current cross sections obtained at the T2K off-axis near detector for $\nu_\mu$-induced events without pions and any number of protons in the final state using transport theory as encoded in the GiBUU model. In a comparison with recent T2K data the strength of the 2p2h multinucleon correlations is determined. Linking this to the isospin (T) of the initial nuclear state, it is found that T=0 leads to a significantly better fit of the recent cross sections obtained by T2K, thus achieving consistency of the 2p2h multi-nucleon correlation contributions between electron-nucleus and neutrino-nucleus reactions.
Highlights
The accurate characterization ofGeV-scale chargedcurrent neutrino-nucleus interactions through differential cross-section measurements is essential for long-baseline neutrino oscillation experiments to determine the neutrino mixing parameters
The inclusive cross sections comprise a sum of quasielastic (CCQE) scattering, 2p2h multinucleon interactions and pion production processes
The 2p2h component is interesting as theoretical models differ substantially in their predicted 2p2h strengths and the systematic uncertainty applied to cover this in oscillation analyses can be one of the largest [1,2]
Summary
The accurate characterization of (sub)GeV-scale chargedcurrent neutrino-nucleus interactions through differential cross-section measurements is essential for long-baseline neutrino oscillation experiments to determine the neutrino mixing parameters. Results from MINERvA measuring muon and proton final states found no evidence of a 2p2h contribution [5], in contrast with their results measuring muon-only final states which suggest a need for 2p2h when considering a relativistic Fermi-gas model for the CCQE component [6]. Comparing this result with more sophisticated nuclear models [7] yields a conclusion consistent with only a CCQE contribution. By invoking consistency with electron data we determine the isospin T of the initial nuclear configuration
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