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Title: Electroweak pion production on nuclei within the extended factorization scheme

Abstract

We have applied the extended factorization scheme to investigate the electroweak pion production on nuclei. The ANL-Osaka model, which was obtained by analyzing the data of πN, γN, N(e,e'π), and N(ν,μπ) reactions up to invariant mass W=2GeV, is used to generate the matrix elements of current operators relevant to pion production off the nucleon. Medium effects on the Δ (1232) component of the meson-exchange current are included by using a Δ-nucleus potential determined from the previous Δ-hole model studies of pion-nucleus reactions. Nuclear correlations in the initial target state and in the spectator system(s) are modeled using realistic hole spectral functions. As a first step, we show that the data of 12C(e,e') up to the Δ (1232) region can be described reasonably well. The interplay between the pion production and two-body meson-exchange mechanisms is shown to be essential in improving the agreement with the data in the “dip” region, between the quasielastic and the Δ (1232) peaks. Predictions for 12C(ν,μπ) have also been made. They can be used to estimate pion-emission rates in neutrino-nucleus cross section, which constitutes an important systematic uncertainty to the reconstructed neutrino energy. With further improvements of the Metropolis Monte Carlo techniques to account for final states comprisedmore » of more than two particles, our approach can be employed up to W=2 GeV, where two-pion production and higher mass nucleon resonances must be included for analyzing the data from accelerator-based neutrino-oscillation experiments.« less

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Theoretical Physics Dept.
  2. Univ. of Science and Technology of China, Hefei (China); State Key Lab. of Particle Detection and Electronics (IHEP-USTC), Hefei (China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; Trento Inst. of Fundamental Physics and Applications, Trento (Italy)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1572343
Alternate Identifier(s):
OSTI ID: 1556977
Report Number(s):
arXiv:1907.01093; FERMILAB-PUB-19-305-T
Journal ID: ISSN 2469-9985; PRVCAN; 155954; TRN: US2100099
Grant/Contract Number:  
AC02-06CH11357; AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 100; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Rocco, Noemi, Nakamura, Satoshi X., Lee, T. -S. H., and Lovato, Alessandro. Electroweak pion production on nuclei within the extended factorization scheme. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.100.045503.
Rocco, Noemi, Nakamura, Satoshi X., Lee, T. -S. H., & Lovato, Alessandro. Electroweak pion production on nuclei within the extended factorization scheme. United States. https://doi.org/10.1103/PhysRevC.100.045503
Rocco, Noemi, Nakamura, Satoshi X., Lee, T. -S. H., and Lovato, Alessandro. Mon . "Electroweak pion production on nuclei within the extended factorization scheme". United States. https://doi.org/10.1103/PhysRevC.100.045503. https://www.osti.gov/servlets/purl/1572343.
@article{osti_1572343,
title = {Electroweak pion production on nuclei within the extended factorization scheme},
author = {Rocco, Noemi and Nakamura, Satoshi X. and Lee, T. -S. H. and Lovato, Alessandro},
abstractNote = {We have applied the extended factorization scheme to investigate the electroweak pion production on nuclei. The ANL-Osaka model, which was obtained by analyzing the data of πN, γN, N(e,e'π), and N(ν,μπ) reactions up to invariant mass W=2GeV, is used to generate the matrix elements of current operators relevant to pion production off the nucleon. Medium effects on the Δ (1232) component of the meson-exchange current are included by using a Δ-nucleus potential determined from the previous Δ-hole model studies of pion-nucleus reactions. Nuclear correlations in the initial target state and in the spectator system(s) are modeled using realistic hole spectral functions. As a first step, we show that the data of 12C(e,e') up to the Δ (1232) region can be described reasonably well. The interplay between the pion production and two-body meson-exchange mechanisms is shown to be essential in improving the agreement with the data in the “dip” region, between the quasielastic and the Δ (1232) peaks. Predictions for 12C(ν,μπ) have also been made. They can be used to estimate pion-emission rates in neutrino-nucleus cross section, which constitutes an important systematic uncertainty to the reconstructed neutrino energy. With further improvements of the Metropolis Monte Carlo techniques to account for final states comprised of more than two particles, our approach can be employed up to W=2 GeV, where two-pion production and higher mass nucleon resonances must be included for analyzing the data from accelerator-based neutrino-oscillation experiments.},
doi = {10.1103/PhysRevC.100.045503},
journal = {Physical Review C},
number = 4,
volume = 100,
place = {United States},
year = {Mon Oct 21 00:00:00 EDT 2019},
month = {Mon Oct 21 00:00:00 EDT 2019}
}

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Figures / Tables:

FIG. 1 FIG. 1: Momentum distributions associated with the hole SF ($n_h$(k)), the mean-field component of the hole SF ($n^{1h}_{h}$ (k)), the free Fermi gas at $k_F$ = 225 MeV ($n$ FG(k)), and the VMC results of [66] ($n^{VMC}_{h}$ (k)).

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