Abstract
The disappearance searching experiments use charged current quasielastic (CCQE) reaction to detect an arriving neutrino and reconstruct its energy, while the CC1π+ production can mimic the CCQE signal process. In appearance experiments, the NC1π0 production process can lead to a fake e- event by the impossibility for the detector of distinguish an arriving electron or a photon. Here we present a consistent model, from the point of view of the construction of the elemental amplitude, for the mentioned pion production background processes including bounding, smearing and final state interaction (FSI) effects in a single fashion. Results are comparable with more evolved approaches based on Monte Carlo simulations.
Highlights
Neutrino oscillation experiments search a distortion in the neutrino flux at a detector positioned far away (L) from the source
New high quality data are becoming from MiniBoone, MINOS, NOMAD, MinerνA and Sci-Boone full dedicated to measure cross sections
A precise knowledge of cross sections is a prerequisite in order to make simulations in event generators to substract fake 1π events in QE countings
Summary
Neutrino oscillation experiments search a distortion in the neutrino flux at a detector positioned far away (L) from the source. Several models have been developed over the last thirty years to evaluate these corresponding background elementary cross sections [1,2,3,4]. In the πN system, described by the 1232 -pole contribution and (in some cases) by higher mass intermediate resonances, plus a nonresonant (B) term describing other processes (where the cross- contribution can be included) leading to πN final states. Nuclear effects and FSI have been introduced by several works, where different nuclear models and event generators or simulations codes have been implemented in [5] (GiBUU) and [6,7]. In this paper we reanalyze the elementary amplitude, bounding+ ground state correlations (GSC) effects, and FSI on the emerging nucleon (N) and pion π , all what will be developed
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