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Title: Deeply Virtual Compton Scattering off the Neutron

Abstract

The three-dimensional structure of nucleons (protons and neutrons) is embedded in so-called generalized parton distributions, which are accessible from deeply virtual Compton scattering. In this process, a high-energy electron is scattered off a nucleon by exchanging a virtual photon. Then, a highly energetic real photon is emitted from one of the quarks inside the nucleon, which carries information on the quark's transverse position and longitudinal momentum. By measuring the cross-section of deeply virtual Compton scattering, Compton form factors related to the generalized parton distributions can be extracted. Here, we report the observation of unpolarized deeply virtual Compton scattering off a deuterium target. From the measured photon-electroproduction cross-sections, we have extracted the cross-section of a quasifree neutron and a coherent deuteron. Due to the approximate isospin symmetry of quantum chromodynamics, we can determine the contributions from the different quark flavours to the helicity-conserved Compton form factors by combining our measurements with previous ones probing the proton's internal structure. These results advance our understanding of the description of the nucleon structure, which is important to solve the proton spin puzzle. The internal structure of the neutron has now been probed by highly energetic photons scattering off it. Combined with previous results formore » protons, these measurements reveal the contributions of quark flavours to the nucleon structure.« 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 Science Foundation (NSF); Centre National de la Recherche Scientifique (CNRS); Commissariat a l’Energie Atomique (CEA)
OSTI Identifier:
1603311
Grant/Contract Number:  
[AC02-06CH11357]
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
[ Journal Volume: 16; Journal Issue: 2]
Country of Publication:
United States
Language:
English

Citation Formats

Benali, M., Desnault, C., Mazouz, M., Ahmed, Z., Albataineh, H, Allada, K, Aniol, K. A., Bellini, V., Boeglin, W., Bertin, P., Riordan, S., and Zhan, X. Deeply Virtual Compton Scattering off the Neutron. United States: N. p., 2020. Web. doi:10.1038/s41567-019-0774-3.
Benali, M., Desnault, C., Mazouz, M., Ahmed, Z., Albataineh, H, Allada, K, Aniol, K. A., Bellini, V., Boeglin, W., Bertin, P., Riordan, S., & Zhan, X. Deeply Virtual Compton Scattering off the Neutron. United States. doi:10.1038/s41567-019-0774-3.
Benali, M., Desnault, C., Mazouz, M., Ahmed, Z., Albataineh, H, Allada, K, Aniol, K. A., Bellini, V., Boeglin, W., Bertin, P., Riordan, S., and Zhan, X. Sat . "Deeply Virtual Compton Scattering off the Neutron". United States. doi:10.1038/s41567-019-0774-3.
@article{osti_1603311,
title = {Deeply Virtual Compton Scattering off the Neutron},
author = {Benali, M. and Desnault, C. and Mazouz, M. and Ahmed, Z. and Albataineh, H and Allada, K and Aniol, K. A. and Bellini, V. and Boeglin, W. and Bertin, P. and Riordan, S. and Zhan, X.},
abstractNote = {The three-dimensional structure of nucleons (protons and neutrons) is embedded in so-called generalized parton distributions, which are accessible from deeply virtual Compton scattering. In this process, a high-energy electron is scattered off a nucleon by exchanging a virtual photon. Then, a highly energetic real photon is emitted from one of the quarks inside the nucleon, which carries information on the quark's transverse position and longitudinal momentum. By measuring the cross-section of deeply virtual Compton scattering, Compton form factors related to the generalized parton distributions can be extracted. Here, we report the observation of unpolarized deeply virtual Compton scattering off a deuterium target. From the measured photon-electroproduction cross-sections, we have extracted the cross-section of a quasifree neutron and a coherent deuteron. Due to the approximate isospin symmetry of quantum chromodynamics, we can determine the contributions from the different quark flavours to the helicity-conserved Compton form factors by combining our measurements with previous ones probing the proton's internal structure. These results advance our understanding of the description of the nucleon structure, which is important to solve the proton spin puzzle. The internal structure of the neutron has now been probed by highly energetic photons scattering off it. Combined with previous results for protons, these measurements reveal the contributions of quark flavours to the nucleon structure.},
doi = {10.1038/s41567-019-0774-3},
journal = {Nature Physics},
number = [2],
volume = [16],
place = {United States},
year = {2020},
month = {2}
}

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