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Seagull and pion-in-flight currents in neutrino-induced 1N and 2N knockout

Tom Van Cuyck (UGent) , Natalie Jachowicz (UGent) , Raúl González Jiménez (UGent) , Jan Ryckebusch (UGent) and Nils Van Dessel (UGent)
Author
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HPC-UGent: the central High Performance Computing infrastructure of Ghent University
Abstract
Background: The neutrino-nucleus (nu A) cross section is a major source of systematic uncertainty in neutrino-oscillation studies. A precise nu A scattering model, in which multinucleon effects are incorporated, is pivotal for an accurate interpretation of the data. Purpose: In nu A interactions, meson-exchange currents (MECs) can induce two-nucleon (2N) knockout from the target nucleus, resulting in a two-particle two-hole (2p2h) final state. They also affect single nucleon (1N) knockout reactions, yielding a one-particle one-hole (1p1h) final state. Both channels affect the inclusive strength. We present a study of axial and vector, seagull and pion-in-flight currents in muon-neutrino induced 1N and 2N knockout reactions on C-12. Method: Bound and emitted nucleons are described as Hartree-Fock wave functions. For the vector MECs, the standard expressions are used. For the axial current, three parametrizations are considered. The framework developed here allows for a treatment of MECs and short-range correlations (SRCs). Results: Results are compared with electron-scattering data and with literature. The strengths of the seagull, pion-in-flight, and axial currents are studied separately and double differential cross sections including MECs are compared with results including SRCs. A comparison with MiniBooNE and T2K data is presented. Conclusions: In the 1p1h channel, the effects of the MECs tend to cancel each other, resulting in a small effect on the double differential cross section. 2N knockout processes provide a small contribution to the inclusive double differential cross section, ranging from the 2N knockout threshold into the dip region. A fair agreement with the MiniBooNE and T2K data is reached.
Keywords
MESON-EXCHANGE CURRENTS, ELASTIC ELECTRON-SCATTERING, MATRIX-ELEMENTS, CROSS-SECTIONS, NUCLEI, ENERGIES, O-16(E, MODEL, C-12

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Citation

Please use this url to cite or link to this publication:

MLA
Van Cuyck, Tom et al. “Seagull and Pion-in-flight Currents in Neutrino-induced 1N and 2N Knockout.” PHYSICAL REVIEW C 95.5 (2017): n. pag. Print.
APA
Van Cuyck, T., Jachowicz, N., González Jiménez, R., Ryckebusch, J., & Van Dessel, N. (2017). Seagull and pion-in-flight currents in neutrino-induced 1N and 2N knockout. PHYSICAL REVIEW C, 95(5).
Chicago author-date
Van Cuyck, Tom, Natalie Jachowicz, Raúl González Jiménez, Jan Ryckebusch, and Nils Van Dessel. 2017. “Seagull and Pion-in-flight Currents in Neutrino-induced 1N and 2N Knockout.” Physical Review C 95 (5).
Chicago author-date (all authors)
Van Cuyck, Tom, Natalie Jachowicz, Raúl González Jiménez, Jan Ryckebusch, and Nils Van Dessel. 2017. “Seagull and Pion-in-flight Currents in Neutrino-induced 1N and 2N Knockout.” Physical Review C 95 (5).
Vancouver
1.
Van Cuyck T, Jachowicz N, González Jiménez R, Ryckebusch J, Van Dessel N. Seagull and pion-in-flight currents in neutrino-induced 1N and 2N knockout. PHYSICAL REVIEW C. 2017;95(5).
IEEE
[1]
T. Van Cuyck, N. Jachowicz, R. González Jiménez, J. Ryckebusch, and N. Van Dessel, “Seagull and pion-in-flight currents in neutrino-induced 1N and 2N knockout,” PHYSICAL REVIEW C, vol. 95, no. 5, 2017.
@article{8525195,
  abstract     = {Background: The neutrino-nucleus (nu A) cross section is a major source of systematic uncertainty in neutrino-oscillation studies. A precise nu A scattering model, in which multinucleon effects are incorporated, is pivotal for an accurate interpretation of the data. 
Purpose: In nu A interactions, meson-exchange currents (MECs) can induce two-nucleon (2N) knockout from the target nucleus, resulting in a two-particle two-hole (2p2h) final state. They also affect single nucleon (1N) knockout reactions, yielding a one-particle one-hole (1p1h) final state. Both channels affect the inclusive strength. We present a study of axial and vector, seagull and pion-in-flight currents in muon-neutrino induced 1N and 2N knockout reactions on C-12. 
Method: Bound and emitted nucleons are described as Hartree-Fock wave functions. For the vector MECs, the standard expressions are used. For the axial current, three parametrizations are considered. The framework developed here allows for a treatment of MECs and short-range correlations (SRCs). 
Results: Results are compared with electron-scattering data and with literature. The strengths of the seagull, pion-in-flight, and axial currents are studied separately and double differential cross sections including MECs are compared with results including SRCs. A comparison with MiniBooNE and T2K data is presented. 
Conclusions: In the 1p1h channel, the effects of the MECs tend to cancel each other, resulting in a small effect on the double differential cross section. 2N knockout processes provide a small contribution to the inclusive double differential cross section, ranging from the 2N knockout threshold into the dip region. A fair agreement with the MiniBooNE and T2K data is reached.},
  articleno    = {054611},
  author       = {Van Cuyck, Tom and Jachowicz, Natalie and González Jiménez, Raúl and Ryckebusch, Jan and Van Dessel, Nils},
  issn         = {2469-9985},
  journal      = {PHYSICAL REVIEW C},
  keywords     = {MESON-EXCHANGE CURRENTS,ELASTIC ELECTRON-SCATTERING,MATRIX-ELEMENTS,CROSS-SECTIONS,NUCLEI,ENERGIES,O-16(E,MODEL,C-12},
  language     = {eng},
  number       = {5},
  pages        = {14},
  title        = {Seagull and pion-in-flight currents in neutrino-induced 1N and 2N knockout},
  url          = {http://dx.doi.org/10.1103/physrevc.95.054611},
  volume       = {95},
  year         = {2017},
}

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