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Electroweak single-pion production off the nucleon : from threshold to high invariant masses

Raúl González Jiménez (UGent) , Natalie Jachowicz (UGent) , Kajetan Niewczas (UGent) , Jannes Nys (UGent) , V Pandey, Tom Van Cuyck (UGent) and Nils Van Dessel (UGent)
(2017) PHYSICAL REVIEW D. 95(11).
Author
Organization
Project
HPC-UGent: the central High Performance Computing infrastructure of Ghent University
Abstract
Neutrino-induced single-pion production (SPP) provides an important contribution to neutrino-nucleus interactions, ranging from intermediate to high energies. There exists a good number of low-energy models in the literature to describe the neutrino production of pions in the region around the Delta resonance. Those models consider only lowest-order interaction terms and, therefore, fail in the high-energy region (pion-nucleon invariant masses, W greater than or similar to 2 GeV). Our goal is to develop a model for electroweak SPP off the nucleon, which is applicable to the entire energy range of interest for present and future accelerator-based neutrino-oscillation experiments. We start with the low-energy model of [E. Hernandez, J. Nieves, and M. Valverde, Phys. Rev. D 76, 033005 (2007).], which includes resonant contributions and background terms derived from the pion-nucleon Lagrangian of chiral-perturbation theory [S. Scherer and M. R. Schindler, A Primer for Chiral Perturbation Theory (Springer, Berlin, 2012), p. 1.]. Then, from the background contributions, we build a high-energy model using a Regge approach. The low-and high-energy models are combined, in a phenomenological way, into a hybrid model. The hybrid model is identical to the low-energy model in the low-W region, but, for W > 2 GeV, it implements the desired high-energy behavior dictated by Regge theory. We have tested the high-energy model by comparing with one-pion production data from electron and neutrino reactions. The hybrid model is compared with electron-proton scattering data, with neutrino SPP data and with the predictions of the NuWro Monte Carlo event generator. Our model is able to provide satisfactory predictions of the electroweak one-pion production cross section from pion threshold to high W. Further investigation and more data are needed to better understand the mechanisms playing a role in the electroweak SPP process in the high-W region, in particular, those involving the axial current contributions.
Keywords
MESON-EXCHANGE MODEL, RESONANCE REGION, KAON PHOTOPRODUCTION, NEUTRINO, ELECTROPRODUCTION, ENERGY, SCATTERING, CURRENTS, GENERATOR, DEUTERON

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Citation

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Chicago
González Jiménez, Raúl, Natalie Jachowicz, Kajetan Niewczas, Jannes Nys, V Pandey, Tom Van Cuyck, and Nils Van Dessel. 2017. “Electroweak Single-pion Production Off the Nucleon : from Threshold to High Invariant Masses.” Physical Review D 95 (11).
APA
González Jiménez, R., Jachowicz, N., Niewczas, K., Nys, J., Pandey, V., Van Cuyck, T., & Van Dessel, N. (2017). Electroweak single-pion production off the nucleon : from threshold to high invariant masses. PHYSICAL REVIEW D, 95(11).
Vancouver
1.
González Jiménez R, Jachowicz N, Niewczas K, Nys J, Pandey V, Van Cuyck T, et al. Electroweak single-pion production off the nucleon : from threshold to high invariant masses. PHYSICAL REVIEW D. 2017;95(11).
MLA
González Jiménez, Raúl, Natalie Jachowicz, Kajetan Niewczas, et al. “Electroweak Single-pion Production Off the Nucleon : from Threshold to High Invariant Masses.” PHYSICAL REVIEW D 95.11 (2017): n. pag. Print.
@article{8526785,
  abstract     = {Neutrino-induced single-pion production (SPP) provides an important contribution to neutrino-nucleus interactions, ranging from intermediate to high energies. There exists a good number of low-energy models in the literature to describe the neutrino production of pions in the region around the Delta resonance. Those models consider only lowest-order interaction terms and, therefore, fail in the high-energy region (pion-nucleon invariant masses, W greater than or similar to 2 GeV). Our goal is to develop a model for electroweak SPP off the nucleon, which is applicable to the entire energy range of interest for present and future accelerator-based neutrino-oscillation experiments. We start with the low-energy model of [E. Hernandez, J. Nieves, and M. Valverde, Phys. Rev. D 76, 033005 (2007).], which includes resonant contributions and background terms derived from the pion-nucleon Lagrangian of chiral-perturbation theory [S. Scherer and M. R. Schindler, A Primer for Chiral Perturbation Theory (Springer, Berlin, 2012), p. 1.]. Then, from the background contributions, we build a high-energy model using a Regge approach. The low-and high-energy models are combined, in a phenomenological way, into a hybrid model. The hybrid model is identical to the low-energy model in the low-W region, but, for W {\textrangle} 2 GeV, it implements the desired high-energy behavior dictated by Regge theory. We have tested the high-energy model by comparing with one-pion production data from electron and neutrino reactions. The hybrid model is compared with electron-proton scattering data, with neutrino SPP data and with the predictions of the NuWro Monte Carlo event generator. Our model is able to provide satisfactory predictions of the electroweak one-pion production cross section from pion threshold to high W. Further investigation and more data are needed to better understand the mechanisms playing a role in the electroweak SPP process in the high-W region, in particular, those involving the axial current contributions.},
  articleno    = {113007},
  author       = {Gonz{\'a}lez Jim{\'e}nez, Ra{\'u}l and Jachowicz, Natalie and Niewczas, Kajetan and Nys, Jannes and Pandey, V and Van Cuyck, Tom and Van Dessel, Nils},
  issn         = {2470-0010},
  journal      = {PHYSICAL REVIEW D},
  keyword      = {MESON-EXCHANGE MODEL,RESONANCE REGION,KAON PHOTOPRODUCTION,NEUTRINO,ELECTROPRODUCTION,ENERGY,SCATTERING,CURRENTS,GENERATOR,DEUTERON},
  language     = {eng},
  number       = {11},
  pages        = {28},
  title        = {Electroweak single-pion production off the nucleon : from threshold to high invariant masses},
  url          = {http://dx.doi.org/10.1103/physrevd.95.113007},
  volume       = {95},
  year         = {2017},
}

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