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Title: Theoretical study of neutrino-induced coherent pion production off nuclei at T2K and MiniBooNE energies

Abstract

We have developed a model for neutrino-induced coherent pion production off nuclei in the energy regime of interest for present and forthcoming neutrino oscillation experiments. It is based on a microscopic model for pion production off the nucleon that, besides the dominant {delta} pole contribution, takes into account the effect of background terms required by chiral symmetry. Moreover, the model uses a reduced nucleon-to-{delta} resonance axial coupling, which leads to coherent pion production cross sections around a factor of 2 smaller than most of the previous theoretical estimates. In the coherent production, the main nuclear effects, namely, medium corrections on the {delta} propagator and the final pion distortion, are included. We have improved on previous similar models by taking into account the nucleon motion and employing a more sophisticated optical potential. As found in previous calculations the modification of the {delta} self-energy inside the nuclear medium strongly reduces the cross section, while the final pion distortion mainly shifts the peak position to lower pion energies. The angular distribution profiles are not much affected by nuclear effects. Nucleon motion increases the cross section by {approx}15% at neutrino energies of 650 MeV, while Coulomb effects on charged pions are estimated to bemore » small. Finally, we discuss at length the deficiencies of the Rein-Sehgal pion coherent production model for neutrino energies below 2 GeV, and, in particular, for the MiniBooNE and T2K experiments. We also predict flux-averaged cross sections for these two latter experiments and K2K.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Departamento de Fisica Atomica, Molecular y Nuclear, Universidad de Granada, E-18071 Granada (Spain)
  2. Grupo de Fisica Nuclear, Departamento de Fisica Fundamental e IUFFyM, Facultad de Ciencias, E-37008 Salamanca (Spain)
  3. Instituto de Fisica Corpuscular (IFIC), Centro Mixto CSIC-Universidad de Valencia, Institutos de Investigacion de Paterna, Aptd. 22085, E-46071 Valencia (Spain)
Publication Date:
OSTI Identifier:
21254671
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 79; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.79.013002; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANGULAR DISTRIBUTION; CHIRAL SYMMETRY; COHERENT PRODUCTION; CORRECTIONS; COULOMB FIELD; COUPLING; CROSS SECTIONS; GEV RANGE 01-10; MEV RANGE 100-1000; MODIFICATIONS; NEUTRINO OSCILLATION; NEUTRINOS; NUCLEI; NUCLEONS; PARTICLE PRODUCTION; PEAKS; PIONS; PIONS MINUS; PIONS NEUTRAL; POTENTIALS; PROPAGATOR; RESONANCE; SELF-ENERGY

Citation Formats

Amaro, J E, Hernandez, E, Nieves, J, Valverde, M, and Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent. Theoretical study of neutrino-induced coherent pion production off nuclei at T2K and MiniBooNE energies. United States: N. p., 2009. Web. doi:10.1103/PHYSREVD.79.013002.
Amaro, J E, Hernandez, E, Nieves, J, Valverde, M, & Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent. Theoretical study of neutrino-induced coherent pion production off nuclei at T2K and MiniBooNE energies. United States. https://doi.org/10.1103/PHYSREVD.79.013002
Amaro, J E, Hernandez, E, Nieves, J, Valverde, M, and Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent. Thu . "Theoretical study of neutrino-induced coherent pion production off nuclei at T2K and MiniBooNE energies". United States. https://doi.org/10.1103/PHYSREVD.79.013002.
@article{osti_21254671,
title = {Theoretical study of neutrino-induced coherent pion production off nuclei at T2K and MiniBooNE energies},
author = {Amaro, J E and Hernandez, E and Nieves, J and Valverde, M and Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent},
abstractNote = {We have developed a model for neutrino-induced coherent pion production off nuclei in the energy regime of interest for present and forthcoming neutrino oscillation experiments. It is based on a microscopic model for pion production off the nucleon that, besides the dominant {delta} pole contribution, takes into account the effect of background terms required by chiral symmetry. Moreover, the model uses a reduced nucleon-to-{delta} resonance axial coupling, which leads to coherent pion production cross sections around a factor of 2 smaller than most of the previous theoretical estimates. In the coherent production, the main nuclear effects, namely, medium corrections on the {delta} propagator and the final pion distortion, are included. We have improved on previous similar models by taking into account the nucleon motion and employing a more sophisticated optical potential. As found in previous calculations the modification of the {delta} self-energy inside the nuclear medium strongly reduces the cross section, while the final pion distortion mainly shifts the peak position to lower pion energies. The angular distribution profiles are not much affected by nuclear effects. Nucleon motion increases the cross section by {approx}15% at neutrino energies of 650 MeV, while Coulomb effects on charged pions are estimated to be small. Finally, we discuss at length the deficiencies of the Rein-Sehgal pion coherent production model for neutrino energies below 2 GeV, and, in particular, for the MiniBooNE and T2K experiments. We also predict flux-averaged cross sections for these two latter experiments and K2K.},
doi = {10.1103/PHYSREVD.79.013002},
url = {https://www.osti.gov/biblio/21254671}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 1,
volume = 79,
place = {United States},
year = {2009},
month = {1}
}