Measurement of the target-normal single-spin asymmetry in quasielastic scattering from the reaction He3↑(e,e')

Zhang, Y. -W.; Long, E.; Mihovilovič, M.; Jin, G.; Allada, K.; Anderson, B.; Annand, J. R.  M.; Averett, T.; Ayerbe-Gayoso, C.; 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, O.; Higinbotham, D. W.; Holmstrom, T.; Huang, J.; Ibrahim, H.; de Jager, C. W.; Jensen, E.; Jiang, X.; John, J. St.; Jones, M.; Kang, H.; Katich, J.; Khanal, H. P.; King, P.; Korsch, W.; LeRose, J.; Lindgren, R.; Lu, H. -J.; Luo, W.; Markowitz, P.; 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.; Qiu, X.; Riordan, S.; Ron, G.; Saha, A.; Sawatzky, B.; Schiavilla, R.; Schoenrock, B.; Shabestari, M.; Shahinyan, A.; Širca, S.; Subedi, R.; Sulkosky, V.; 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/PhysRevLett.115.172502

Measurement of the target-normal single-spin asymmetry in quasielastic scattering from the reaction ${}^{3}{He}^{↑} (e, e^{'})$

Journal Article · Thu Oct 22 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.115.172502· OSTI ID:1224078

Zhang, Y. -W.; Long, E.; Mihovilovič, M.; Jin, G.; Allada, K.; Anderson, B.; Annand, J. R. M.; Averett, T.; Ayerbe-Gayoso, C.; 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. more »

We report the first measurement of the target single-spin asymmetry, Ay, in quasi-elastic scattering from the inclusive reaction ³He↑ (e,e') on a ³He gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A non-zero A_y can arise from the interference between the one- and two-photon exchange processes which is sensitive to the details of the sub-structure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q²= 0.13, 0.46 and 0.97 GeV². These measurements demonstrate, for the first time, that the 3He asymmetry is clearly non-zero and negative with a statistical significance of (8-10)σ. Using measured proton-to-³He cross-section ratios and the effective polarization approximation, neutron asymmetries of -(1-3)% were obtained. The neutron asymmetry at high Q² is related to moments of the Generalized Parton Distributions (GPDs). Our measured neutron asymmetry at Q²=0.97 GeV² agrees well with a prediction based on two-photon exchange using a GPD model and in addition provides a new independent constraint on these distributions.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Contributing Organization:: Jefferson Lab Hall A Collaboration

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1224078

Alternate ID(s):: OSTI ID: 1224147

Report Number(s):: DOE/OR/23177--3321; JLAB-PHY--15-2021; arXiv:1502.02636; National Science Foundation of China and UK STFC grants 57071/1, 50727/1.

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 115; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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The spin structure of the nucleon Kabuss, Eva-Maria Czechoslovak Journal of Physics, Vol. 55, Issue S1 https://doi.org/10.1007/bf03031986	journal	January 2005
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Lepton mass effects for beam-normal single-spin asymmetry in elastic muon-proton scattering Koshchii, Oleksandr; Afanasev, Andrei Physical Review D, Vol. 100, Issue 9 https://doi.org/10.1103/physrevd.100.096020	journal	November 2019
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Two-photon exchange contribution to elastic e − -proton scattering: Full dispersive treatment of π N states and comparison with data Tomalak, Oleksandr; Pasquini, Barbara; Vanderhaeghen, Marc Physical Review D, Vol. 96, Issue 9 https://doi.org/10.1103/physrevd.96.096001	journal	November 2017
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Lepton mass effects for beam-normal single-spin asymmetry in elastic muon-proton scattering Koshchii, Oleksandr; Afanasev, Andrei arXiv https://doi.org/10.48550/arxiv.1905.10217	text	January 2019

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