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Title: Measurement of the target-normal single-spin asymmetry in quasielastic scattering from the reaction He 3 ( e , e ' )

Abstract

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 Ay 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.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Org.:
Jefferson Lab Hall A Collaboration
OSTI Identifier:
1224078
Alternate Identifier(s):
OSTI ID: 1224147
Report Number(s):
JLAB-PHY-15-2021; DOE/OR/23177-3321; arXiv:1502.02636
Journal ID: ISSN 0031-9007; PRLTAO; National Science Foundation of China and UK STFC grants 57071/1, 50727/1.; TRN: US1600790
Grant/Contract Number:  
AC05-06OR23177
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 17; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

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., and Zhu, L.. Measurement of the target-normal single-spin asymmetry in quasielastic scattering from the reaction He3↑(e,e'). United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.115.172502.
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.. Measurement of the target-normal single-spin asymmetry in quasielastic scattering from the reaction He3↑(e,e'). United States. https://doi.org/10.1103/PhysRevLett.115.172502
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., and Zhu, L.. Thu . "Measurement of the target-normal single-spin asymmetry in quasielastic scattering from the reaction He3↑(e,e')". United States. https://doi.org/10.1103/PhysRevLett.115.172502. https://www.osti.gov/servlets/purl/1224078.
@article{osti_1224078,
title = {Measurement of the target-normal single-spin asymmetry in quasielastic scattering from the reaction He3↑(e,e')},
author = {Zhang, Y. -W. and Long, E. and Mihovilovič, M. and Jin, G. and Allada, K. and Anderson, B. and Annand, J. R. M. and Averett, T. and Ayerbe-Gayoso, C. and Boeglin, W. and Bradshaw, P. and Camsonne, A. and Canan, M. and Cates, G. D. and Chen, C. and Chen, J. P. and Chudakov, E. and De Leo, R. and Deng, X. and Deur, A. and Dutta, C. and El Fassi, L. and Flay, D. and Frullani, S. and Garibaldi, F. and Gao, H. and Gilad, S. and Gilman, R. and Glamazdin, O. and Golge, S. and Gomez, J. and Hansen, O. and Higinbotham, D. W. and Holmstrom, T. and Huang, J. and Ibrahim, H. and de Jager, C. W. and Jensen, E. and Jiang, X. and John, J. St. and Jones, M. and Kang, H. and Katich, J. and Khanal, H. P. and King, P. and Korsch, W. and LeRose, J. and Lindgren, R. and Lu, H. -J. and Luo, W. and Markowitz, P. and Meziane, M. and Michaels, R. and Moffit, B. and Monaghan, P. and Muangma, N. and Nanda, S. and Norum, B. E. and Pan, K. and Parno, D. and Piasetzky, E. and Posik, M. and Punjabi, V. and Puckett, A. J. R. and Qian, X. and Qiang, Y. and Qiu, X. and Riordan, S. and Ron, G. and Saha, A. and Sawatzky, B. and Schiavilla, R. and Schoenrock, B. and Shabestari, M. and Shahinyan, A. and Širca, S. and Subedi, R. and Sulkosky, V. and Tobias, W. A. and Tireman, W. and Urciuoli, G. M. and Wang, D. and Wang, K. and Wang, Y. and Watson, J. and Wojtsekhowski, B. and Ye, Z. and Zhan, X. and Zhang, Y. and Zheng, X. and Zhao, B. and Zhu, L.},
abstractNote = {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 Ay 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.},
doi = {10.1103/PhysRevLett.115.172502},
journal = {Physical Review Letters},
number = 17,
volume = 115,
place = {United States},
year = {Thu Oct 22 00:00:00 EDT 2015},
month = {Thu Oct 22 00:00:00 EDT 2015}
}

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Works referenced in this record:

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