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Title: Detection of back-to-back proton pairs in charged-current neutrino interactions with the ArgoNeuT detector in the NuMI low energy beam line

Abstract

Short range nucleon-nucleon correlations in nuclei (NN SRC) carry important information on nuclear structure and dynamics. NN SRC have been extensively probed through two-nucleon knock- out reactions in both pion and electron scattering experiments. We report here on the detection of two-nucleon knock-out events from neutrino interactions and discuss their topological features as possibly involving NN SRC content in the target argon nuclei. The ArgoNeuT detector in the Main Injector neutrino beam at Fermilab has recorded a sample of 30 fully reconstructed charged current events where the leading muon is accompanied by a pair of protons at the interaction vertex, 19 of which have both protons above the Fermi momentum of the Ar nucleus. Out of these 19 events, four are found with the two protons in a strictly back-to-back high momenta configuration directly observed in the final state and can be associated to nucleon Resonance pionless mechanisms involving a pre-existing short range correlated np pair in the nucleus. Another fraction (four events) of the remaining 15 events have a reconstructed back-to-back configuration of a np pair in the initial state, a signature compatible with one-body Quasi Elastic interaction on a neutron in a SRC pair. The detection of thesemore » two subsamples of the collected (mu- + 2p) events suggests that mechanisms directly involving nucleon-nucleon SRC pairs in the nucleus are active and can be efficiently explored in neutrino-argon interactions with the LAr TPC technology.« less

Authors:
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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)
Contributing Org.:
ArgoNeuT
OSTI Identifier:
1409390
Report Number(s):
arXiv:1405.4261; FERMILAB-PUB-14-615-E
Journal ID: ISSN 1550-7998; PRVDAQ; 1296836
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 90; Journal Issue: 1; Journal ID: ISSN 1550-7998
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

Acciarri, R., Adams, C., Asaadi, J., Baller, B., Bolton, T., Bromberg, C., Cavanna, F., Church, E., Edmunds, D., Ereditato, A., Farooq, S., Fleming, B., Greenlee, H., Horton-Smith, G., James, C., Klein, E., Lang, K., Laurens, P., Mehdiyev, R., Page, B., Palamara, O., Partyka, K., Rameika, G., Rebel, B., Soderberg, M., Spitz, J., Szelc, A. M., Weber, M., Yang, T., and Zeller, G. P. Detection of back-to-back proton pairs in charged-current neutrino interactions with the ArgoNeuT detector in the NuMI low energy beam line. United States: N. p., 2014. Web. doi:10.1103/PhysRevD.90.012008.
Acciarri, R., Adams, C., Asaadi, J., Baller, B., Bolton, T., Bromberg, C., Cavanna, F., Church, E., Edmunds, D., Ereditato, A., Farooq, S., Fleming, B., Greenlee, H., Horton-Smith, G., James, C., Klein, E., Lang, K., Laurens, P., Mehdiyev, R., Page, B., Palamara, O., Partyka, K., Rameika, G., Rebel, B., Soderberg, M., Spitz, J., Szelc, A. M., Weber, M., Yang, T., & Zeller, G. P. Detection of back-to-back proton pairs in charged-current neutrino interactions with the ArgoNeuT detector in the NuMI low energy beam line. United States. doi:10.1103/PhysRevD.90.012008.
Acciarri, R., Adams, C., Asaadi, J., Baller, B., Bolton, T., Bromberg, C., Cavanna, F., Church, E., Edmunds, D., Ereditato, A., Farooq, S., Fleming, B., Greenlee, H., Horton-Smith, G., James, C., Klein, E., Lang, K., Laurens, P., Mehdiyev, R., Page, B., Palamara, O., Partyka, K., Rameika, G., Rebel, B., Soderberg, M., Spitz, J., Szelc, A. M., Weber, M., Yang, T., and Zeller, G. P. Tue . "Detection of back-to-back proton pairs in charged-current neutrino interactions with the ArgoNeuT detector in the NuMI low energy beam line". United States. doi:10.1103/PhysRevD.90.012008. https://www.osti.gov/servlets/purl/1409390.
@article{osti_1409390,
title = {Detection of back-to-back proton pairs in charged-current neutrino interactions with the ArgoNeuT detector in the NuMI low energy beam line},
author = {Acciarri, R. and Adams, C. and Asaadi, J. and Baller, B. and Bolton, T. and Bromberg, C. and Cavanna, F. and Church, E. and Edmunds, D. and Ereditato, A. and Farooq, S. and Fleming, B. and Greenlee, H. and Horton-Smith, G. and James, C. and Klein, E. and Lang, K. and Laurens, P. and Mehdiyev, R. and Page, B. and Palamara, O. and Partyka, K. and Rameika, G. and Rebel, B. and Soderberg, M. and Spitz, J. and Szelc, A. M. and Weber, M. and Yang, T. and Zeller, G. P.},
abstractNote = {Short range nucleon-nucleon correlations in nuclei (NN SRC) carry important information on nuclear structure and dynamics. NN SRC have been extensively probed through two-nucleon knock- out reactions in both pion and electron scattering experiments. We report here on the detection of two-nucleon knock-out events from neutrino interactions and discuss their topological features as possibly involving NN SRC content in the target argon nuclei. The ArgoNeuT detector in the Main Injector neutrino beam at Fermilab has recorded a sample of 30 fully reconstructed charged current events where the leading muon is accompanied by a pair of protons at the interaction vertex, 19 of which have both protons above the Fermi momentum of the Ar nucleus. Out of these 19 events, four are found with the two protons in a strictly back-to-back high momenta configuration directly observed in the final state and can be associated to nucleon Resonance pionless mechanisms involving a pre-existing short range correlated np pair in the nucleus. Another fraction (four events) of the remaining 15 events have a reconstructed back-to-back configuration of a np pair in the initial state, a signature compatible with one-body Quasi Elastic interaction on a neutron in a SRC pair. The detection of these two subsamples of the collected (mu- + 2p) events suggests that mechanisms directly involving nucleon-nucleon SRC pairs in the nucleus are active and can be efficiently explored in neutrino-argon interactions with the LAr TPC technology.},
doi = {10.1103/PhysRevD.90.012008},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
issn = {1550-7998},
number = 1,
volume = 90,
place = {United States},
year = {2014},
month = {7}
}

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