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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 $$\pi N$$, $$\gamma N$$, $$N(e,e'\pi)$$ and $$N(\nu,\mu\,\pi) $$ 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 $$\Delta$$ (1232) component of meson-exchange current are included by using a $$\Delta$$-nucleus potential determined from the previous $$\Delta$$-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 $$^{12}$$C$(e,e')$ up to the $$\Delta$$ (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 $$\Delta$$ (1232) peaks. Predictions for $$^{12}$$C$$(\nu,\mu\,\pi)$$ 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.

Authors:
 [1];  [2];  [3];  [4]
  1. Fermilab
  2. CUST, SKLPDE
  3. Argonne, PHY
  4. TIFPA-INFN, Trento
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1556977
Report Number(s):
arXiv:1907.01093; FERMILAB-PUB-19-305-T
1742296
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
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.
Rocco, Noemi, Nakamura, Satoshi X., Lee, T. S.H., & Lovato, Alessandro. Electroweak Pion-Production on Nuclei within the Extended Factorization Scheme. United States.
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://www.osti.gov/servlets/purl/1556977.
@article{osti_1556977,
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 $\pi N$, $\gamma N$, $N(e,e'\pi)$ and $N(\nu,\mu\,\pi) $ 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 $\Delta$ (1232) component of meson-exchange current are included by using a $\Delta$-nucleus potential determined from the previous $\Delta$-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 $^{12}$C$(e,e')$ up to the $\Delta$ (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 $\Delta$ (1232) peaks. Predictions for $^{12}$C$(\nu,\mu\,\pi)$ 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 = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {7}
}