Neutral current neutrino-nucleus interactions at intermediate energies

We present a model for electron-and neutrino-scattering off nucleons and nuclei focussing on the quasielastic and resonance region. The lepton-nucleon reaction is described within a relativistic formalism that includes, besides quasielastic scattering, the excitation of 13 N * and ∆ resonances and a non-resonant single-pion background. Recent electron-scattering data is used for the state-ofthe-art parametrizations of the vector form factors; the axial couplings are determined via PCAC and, in the case of the ∆ resonance, the axial form factor is refitted using neutrino-scattering data. Scattering off nuclei is treated within the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) framework that takes into account various nuclear effects: the local density approximation for the nuclear ground state; mean-field potentials and in-medium spectral functions. Results for inclusive scattering off Oxygen are presented and, in the case of electron-induced reactions, compared to experimental data and other models.

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“…First results, where we included only QE and ∆ excitation, have already been presented in Refs. [29,30] for CC and NC neutrino induced reactions.…”

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confidence: 99%

Electron- and neutrino-nucleus scattering from the quasielastic to the resonance region

et al. 2009

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“…The study of semi-inclusive pion production presented in Ref. [11] includes pion absorption and charge exchange but does not properly take into account the important features of πN ∆ dynamics, leading to unrealistic pion spectra [12,13]. Extending the model of Ref.…”

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“…General results were presented in Refs. [13,17]. The GiBUU model is based on well-founded theoretical ingredients and has been tested in various and very different reactions, in particular, against electron and photon scattering data [3,18].…”

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Neutrino-induced pion production at energies relevant for the MiniBooNE and K2K experiments

et al. 2009

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We investigate charged and neutral current neutrino induced incoherent pion production off nuclei at MiniBooNE and K2K energies within the GiBUU model. We assume impulse approximation and treat the nucleus as a local Fermi gas of nucleons bound in a mean-field potential. In-medium spectral functions are also taken into account. The outcome of the initial neutrino nucleon reaction undergoes complex hadronic final state interactions. We present results for neutral current π 0 and charged current π + production and compare to MiniBooNE and K2K data.

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“…The details of this model and an extensive set of results for νA scattering can be found in Refs. [23] and were presented by U. Mosel at this conference [24]. The coherent fraction at MiniBooNE in our model is found to be σ (coh.)…”

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Neutrino-induced coherent pion production

Alvarez‐Ruso¹,

Geng²,

Hirenzaki³

et al. 2007

AIP Conference Proceedings

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Abstract. We have investigated the neutrino induced coherent pion production reaction at the energies of interest for recent experiments like K2K and MiniBooNE. The model includes pion, nucleon and the ∆(1232) resonance. Medium effects in the production mechanism and the distortion of the pion wave function are taken into account. We find a strong reduction of the cross section due to these effects and also substantial modifications in the energy distributions of the final pion. The sensitivity of the results on the axial N-∆ coupling C A 5 (0) and the coherent fraction in neutral-current π 0 production are discussed.Keywords: Neutrino-nucleus interactions, N-∆ form factors, Pions in the nuclear medium PACS: 25.30. Pt, 13.15.+g, 23.40.Bw The coherent production of pions in charged current (CC) and neutral current (NC) processes is a subject of research in current and future experiments. The K2K collaboration has not found any evidence of ν µ + 12 C → µ − + π + + 12 C, obtaining an upper limit for the coherent fraction over the total CC interaction [1] well below the estimates based on the Rein and Sehgal model [2]. On the other side, preliminary MiniBooNE results indicate that part of the NC π 0 production comes from the coherent reaction ν + 12 C → ν + π 0 + 12 C [3]. In future, the SciBooNE detector [4] should be able to identify π 0 's emitted in the forward direction, where most of the coherent events are concentrated, while MINERνA [5] will collect data with high statistics, allowing for a clear separation between coherent and incoherent processes and the comparison between neutrino and antineutrino cross sections.Since the pioneering work of Ref.[2] some other studies focused on the energy region ∼ 1 GeV, where the modification of the ∆(1232) spectral function inside the nuclear medium is relevant [6,7,8]. Pion distortion is taken into account in Refs. [2,9] by factorizing the pion-nucleus elastic cross section (c.s.). In a more general fashion, it can be incorporated in the amplitude by means of the distorted wave Born approximation, using a pion wave function obtained in the eikonal limit [8] or by solving the KleinGordon equation with a realistic optical potential [7].We have performed a theoretical study of neutrino induced coherent pion [10, 11] production extending and improving the calculations of Refs. [7,8]. The model is built in terms of the relevant hadronic degrees of freedom: pion, nucleon and ∆ resonance. Besides the dominant direct ∆ excitation, it includes the crossed ∆ and nucleon-pole terms [11] (see the left panel of Fig. 1). There are other contributions allowed by chiral symmetry [12] but they cancel for isospin symmetric nuclei, so we neglect them.The relativistic amplitude is proportional to the product of the standard leptonic

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Neutral current neutrino-nucleus interactions at intermediate energies

Cited by 55 publications

References 79 publications

Electron- and neutrino-nucleus scattering from the quasielastic to the resonance region

Electron- and neutrino-nucleus scattering from the quasielastic to the resonance region

Neutrino-induced pion production at energies relevant for the MiniBooNE and K2K experiments

Neutrino-induced coherent pion production

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