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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 π N, γ N, N(e,e'π), and N(ν,μπ) reactions up to invariant mass W = 2 GeV, 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 Carlomore » 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« less

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Nuclear Physics; National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1572343
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 100; Journal Issue: 4; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

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. doi: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. doi:10.1103/PhysRevC.100.045503.
@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 = 2 GeV, 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},
doi = {10.1103/PhysRevC.100.045503},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 4,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}