Abstract
A phenomenological model of two-body current (2p2h) contribution to neutrino cross section is introduced. Predictions of the Valencia model for 2p2h are modified using recent CC0pi measurements from T2K and MINERvA experiments. Our results suggest a significant increase of the 2p2h cross section at neutrino energies bigger than 1 GeV and also a redistribution of 2p2h events as function of energy and momentum transfer. This may have a big impact on neutrino energy reconstruction in neutrino oscillation parameters.
Highlights
One of the most important unknowns in modeling neutrinonucleus cross sections [1] is the size of the contribution coming from two-body current (2p2h) mechanism [2,3,4]
It is important to have a precise estimate of the fraction of events originating from this mechanism because in detectors such as SuperKamiokande they cannot be distinguished from charge current quasielastic (CCQE) scatterings on bound nucleons νl + n → l− + p, νl + p → l+ + n, (1)
For the energies lower than ≈700 MeV the phenomenological model cross sections are lower with respect to the Valencia model
Summary
One of the most important unknowns in modeling neutrinonucleus cross sections [1] is the size of the contribution coming from two-body current (2p2h) mechanism [2,3,4]. It is important to have a precise estimate of the fraction of events originating from this mechanism because in detectors such as SuperKamiokande they cannot be distinguished from charge current quasielastic (CCQE) scatterings on bound nucleons νl + n → l− + p, νl + p → l+ + n, (1). Where l is lepton’s flavor, n, p are neutron and proton, respectively. This leads to a bias in the neutrino energy reconstruction [5,6,7,8,9,10,11] and strongly affects the precision of neutrino oscillation parameters measurements. At larger neutrino energies theoretical model predictions differ significantly among themselves [22]
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