Extraction of the neutron electric form factor from measurements of inclusive double spin asymmetries

Sulkosky, V.; Jin, G.; Long, E.; Zhang, Y. -W.; Mihovilovic, M.; Kelleher, A.; Anderson, B.; Higinbotham, D. W.; Širca, S.; Allada, K.; Annand, J. R.  M.; Averett, T.; Bertozzi, W.; Boeglin, W.; Bradshaw, P.; Camsonne, A.; Canan, M.; Cates, G. D.; Chen, C.; Chen, J. -P.; Chudakov, E.; De Leo, R.; Deng, X.; Deur, A.; Dutta, C.; El Fassi, L.; Flay, D.; Frullani, S.; Garibaldi, F.; Gao, H.; Gilad, S.; Gilman, R.; Glamazdin, O.; Golge, S.; Gomez, J.; Hansen, J. -O.; Holmstrom, T.; Huang, J.; Ibrahim, H.; de Jager, C. W.; Jensen, E.; Jiang, X.; Jones, M.; Kang, H.; Katich, J.; Khanal, H. P.; King, P.; Korsch, W.; LeRose, J.; Lindgren, R.; Lu, H. -J.; Luo, W.; Markowitz, P.; Meekins, D.; Meziane, M.; Michaels, R.; Moffit, B.; Monaghan, P.; Muangma, N.; Nanda, S.; Norum, B. E.; Pan, K.; Parno, D.; Piasetzky, E.; Posik, M.; Punjabi, V.; Puckett, A. J.  R.; Qian, X.; Qiang, Y.; Qui, X.; Riordan, S.; Saha, A.; Sawatzky, B.; Shabestari, M.; Shahinyan, A.; Shoenrock, B.; John, J. St.; Subedi, R.; Tobias, W. A.; Tireman, W.; Urciuoli, G. M.; Wang, D.; Wang, K.; Wang, Y.; Watson, J.; Wojtsekhowski, B.; Ye, Z.; Zhan, X.; Zhang, Y.; Zheng, X.; Zhao, B.; Zhu, L.

doi:10.1103/PhysRevC.96.065206

Title: Extraction of the neutron electric form factor from measurements of inclusive double spin asymmetries

Journal Article · Tue Dec 26 00:00:00 EST 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.96.065206· OSTI ID:1415354

Sulkosky, V.; Jin, G.; Long, E.; Zhang, Y. -W.; Mihovilovic, M.; Kelleher, A.; Anderson, B.; Higinbotham, D. W.; Širca, S.; Allada, K.; Annand, J. R. M.; Averett, T.; Bertozzi, W.; Boeglin, W.; Bradshaw, P.; Camsonne, A.; Canan, M.; Cates, G. D.; Chen, C.; Chen, J. -P. more »

Background: Measurements of the neutron charge form factor, G$$n\atop{E}$$, are challenging because the neutron has no net charge. Additionally, measurements of the neutron form factors must use nuclear targets which require accurately accounting for nuclear effects. Extracting G$$n\atop{E}$$ with different targets and techniques provides an important test of our handling of these effects. Purpose: The goal of the measurement was to use an inclusive asymmetry measurement technique to extract the neutron charge form factor at a four-momentum transfer of 1 (GeV/c)². This technique has very different systematic uncertainties than traditional exclusive measurements and thus serves as an independent check of whether nuclear effects have been taken into account correctly. Method: The inclusive quasielastic reaction ³$$→\atop{He}$$ ($$→\atop{e}$$, e') was measured at Jefferson Laboratory. The neutron electric form factor, G$$n\atop{E}$$, was extracted at Q² = 0.98 ( GeV/c)² from ratios of electron-polarization asymmetries measured for two orthogonal target spin orientations. This Q² is high enough that the sensitivity to G$$n\atop{E}$$ is not overwhelmed by the neutron magnetic contribution, and yet low enough that explicit neutron detection is not required to suppress pion production. Results: The neutron electric form factor, G$$n\atop{E}$$, was determined to be 0.0414 ± 0.0077 ( stat ) ± 0.0022 ( syst ), providing the first high-precision inclusive extraction of the neutron's charge form factor. In conclusion: The use of the inclusive quasielastic ³$$→\atop{He}$$ ($$→\atop{e}$$, e') with a four-momentum transfer near 1 (GeV/c)² has been used to provide a unique measurement of G$$n\atop{E}$$. This new result provides a systematically independent validation of the exclusive extraction technique results and implies that the nuclear corrections are understood. This is contrary to the proton form factor where asymmetry and differential cross section measurements have been shown to have large systematic differences.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Mississippi State Univ., Mississippi State, MS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)

Contributing Organization:: Jefferson Lab Hall A Collaboration

Grant/Contract Number:: AC05-06OR23177; FG02-07ER41528

OSTI ID:: 1415354

Alternate ID(s):: OSTI ID: 1414851; OSTI ID: 1604273

Report Number(s):: JLAB-PHY-17-2480; DOE/OR/-23177-4155; arXiv:1704.06253; PRVCAN; TRN: US1800770

Journal Information:: Physical Review C, Vol. 96, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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