Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He 3 ↑ (e,e′)

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

doi:10.1103/PhysRevLett.115.172502

Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He 3 ↑ (e,e′)

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

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Abstract

We report the first measurement of the target single-spin asymmetry, Ay, in quasielastic scattering from the inclusive reaction He3↑(e,e′) on a He3 gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A nonzero Ay can arise from the interference between the one- and two-photon exchange processes which is sensitive to the details of the substructure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q2=0.13, 0.46, and 0.97GeV2. These measurements demonstrate, for the first time, that the He3 asymmetry is clearly nonzero and negative at the 4σ-9σ level. Using measured proton-to-He3 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=0.97GeV2 agrees well with a prediction based on two-photon exchange using a GPD model and thus provides a new, independent constraint on these distributions.

Original language	English
Article number	172502
Journal	Physical Review Letters
Volume	115
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.115.172502
Publication status	Published - 22 Oct 2015
Externally published	Yes

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10.1103/PhysRevLett.115.172502

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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., ... Zhu, L. (2015). Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He 3 ↑ (e,e′). Physical Review Letters, 115(17), Article 172502. https://doi.org/10.1103/PhysRevLett.115.172502

@article{9cf8a5105b2e44979d080c8413c67c29,

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 quasielastic scattering from the inclusive reaction He3↑(e,e′) on a He3 gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A nonzero Ay can arise from the interference between the one- and two-photon exchange processes which is sensitive to the details of the substructure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q2=0.13, 0.46, and 0.97GeV2. These measurements demonstrate, for the first time, that the He3 asymmetry is clearly nonzero and negative at the 4σ-9σ level. Using measured proton-to-He3 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=0.97GeV2 agrees well with a prediction based on two-photon exchange using a GPD model and thus provides a new, independent constraint on these distributions.",

author = "Zhang, {Y. W.} and E. Long and M. Mihovilovi{\v c} and G. Jin and K. Allada and B. Anderson and Annand, {J. R.M.} and T. Averett and C. Ayerbe-Gayoso and W. Boeglin and P. Bradshaw and A. Camsonne and M. Canan and Cates, {G. D.} and C. Chen and Chen, {J. P.} and E. Chudakov and {De Leo}, R. and X. Deng and A. Deur and C. Dutta and {El Fassi}, L. and D. Flay and S. Frullani and F. Garibaldi and H. Gao and S. Gilad and R. Gilman and O. Glamazdin and S. Golge and J. Gomez and O. Hansen and Higinbotham, {D. W.} and T. Holmstrom and J. Huang and H. Ibrahim and {De Jager}, {C. W.} and E. Jensen and X. Jiang and John, {J. St} and M. Jones and H. Kang and J. Katich and Khanal, {H. P.} and P. King and W. Korsch and J. Lerose and R. Lindgren and Lu, {H. J.} and W. Luo and P. Markowitz and M. Meziane and R. Michaels and B. Moffit and P. Monaghan and N. Muangma and S. Nanda and Norum, {B. E.} and K. Pan and D. Parno and E. Piasetzky and M. Posik and V. Punjabi and Puckett, {A. J.R.} and X. Qian and Y. Qiang and X. Qiu and S. Riordan and G. Ron and A. Saha and B. Sawatzky and R. Schiavilla and B. Schoenrock and M. Shabestari and A. Shahinyan and S. {\v S}irca and R. Subedi and V. Sulkosky and Tobias, {W. A.} and W. Tireman and Urciuoli, {G. M.} and D. Wang and K. Wang and Y. Wang and J. Watson and B. Wojtsekhowski and Z. Ye and X. Zhan and Y. Zhang and X. Zheng and B. Zhao and L. Zhu",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = oct,

day = "22",

doi = "10.1103/PhysRevLett.115.172502",

language = "English",

volume = "115",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "17",

}

Zhang, YW, Long, E, Mihovilovič, M, Jin, G, Allada, K, Anderson, B, Annand, JRM, Averett, T, Ayerbe-Gayoso, C, Boeglin, W, Bradshaw, P, Camsonne, A, Canan, M, Cates, GD, Chen, C, Chen, JP, 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, DW, Holmstrom, T, Huang, J, Ibrahim, H, De Jager, CW, Jensen, E, Jiang, X, John, JS, Jones, M, Kang, H, Katich, J, Khanal, HP, King, P, Korsch, W, Lerose, J, Lindgren, R, Lu, HJ, Luo, W, Markowitz, P, Meziane, M, Michaels, R, Moffit, B, Monaghan, P, Muangma, N, Nanda, S, Norum, BE, Pan, K, Parno, D, Piasetzky, E, Posik, M, Punjabi, V, Puckett, AJR, 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, WA, Tireman, W, Urciuoli, GM, Wang, D, Wang, K, Wang, Y, Watson, J, Wojtsekhowski, B, Ye, Z, Zhan, X, Zhang, Y, Zheng, X, Zhao, B & Zhu, L 2015, 'Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He 3 ↑ (e,e′)', Physical Review Letters, vol. 115, no. 17, 172502. https://doi.org/10.1103/PhysRevLett.115.172502

TY - JOUR

T1 - Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He 3 ↑ (e,e′)

AU - Zhang, Y. W.

AU - Long, E.

AU - Mihovilovič, M.

AU - Jin, G.

AU - Allada, K.

AU - Anderson, B.

AU - Annand, J. R.M.

AU - Averett, T.

AU - Ayerbe-Gayoso, C.

AU - Boeglin, W.

AU - Bradshaw, P.

AU - Camsonne, A.

AU - Canan, M.

AU - Cates, G. D.

AU - Chen, C.

AU - Chen, J. P.

AU - Chudakov, E.

AU - De Leo, R.

AU - Deng, X.

AU - Deur, A.

AU - Dutta, C.

AU - El Fassi, L.

AU - Flay, D.

AU - Frullani, S.

AU - Garibaldi, F.

AU - Gao, H.

AU - Gilad, S.

AU - Gilman, R.

AU - Glamazdin, O.

AU - Golge, S.

AU - Gomez, J.

AU - Hansen, O.

AU - Higinbotham, D. W.

AU - Holmstrom, T.

AU - Huang, J.

AU - Ibrahim, H.

AU - De Jager, C. W.

AU - Jensen, E.

AU - Jiang, X.

AU - John, J. St

AU - Jones, M.

AU - Kang, H.

AU - Katich, J.

AU - Khanal, H. P.

AU - King, P.

AU - Korsch, W.

AU - Lerose, J.

AU - Lindgren, R.

AU - Lu, H. J.

AU - Luo, W.

AU - Markowitz, P.

AU - Meziane, M.

AU - Michaels, R.

AU - Moffit, B.

AU - Monaghan, P.

AU - Muangma, N.

AU - Nanda, S.

AU - Norum, B. E.

AU - Pan, K.

AU - Parno, D.

AU - Piasetzky, E.

AU - Posik, M.

AU - Punjabi, V.

AU - Puckett, A. J.R.

AU - Qian, X.

AU - Qiang, Y.

AU - Qiu, X.

AU - Riordan, S.

AU - Ron, G.

AU - Saha, A.

AU - Sawatzky, B.

AU - Schiavilla, R.

AU - Schoenrock, B.

AU - Shabestari, M.

AU - Shahinyan, A.

AU - Širca, S.

AU - Subedi, R.

AU - Sulkosky, V.

AU - Tobias, W. A.

AU - Tireman, W.

AU - Urciuoli, G. M.

AU - Wang, D.

AU - Wang, K.

AU - Wang, Y.

AU - Watson, J.

AU - Wojtsekhowski, B.

AU - Ye, Z.

AU - Zhan, X.

AU - Zhang, Y.

AU - Zheng, X.

AU - Zhao, B.

AU - Zhu, L.

PY - 2015/10/22

Y1 - 2015/10/22

N2 - We report the first measurement of the target single-spin asymmetry, Ay, in quasielastic scattering from the inclusive reaction He3↑(e,e′) on a He3 gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A nonzero Ay can arise from the interference between the one- and two-photon exchange processes which is sensitive to the details of the substructure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q2=0.13, 0.46, and 0.97GeV2. These measurements demonstrate, for the first time, that the He3 asymmetry is clearly nonzero and negative at the 4σ-9σ level. Using measured proton-to-He3 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=0.97GeV2 agrees well with a prediction based on two-photon exchange using a GPD model and thus provides a new, independent constraint on these distributions.

AB - We report the first measurement of the target single-spin asymmetry, Ay, in quasielastic scattering from the inclusive reaction He3↑(e,e′) on a He3 gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A nonzero Ay can arise from the interference between the one- and two-photon exchange processes which is sensitive to the details of the substructure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q2=0.13, 0.46, and 0.97GeV2. These measurements demonstrate, for the first time, that the He3 asymmetry is clearly nonzero and negative at the 4σ-9σ level. Using measured proton-to-He3 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=0.97GeV2 agrees well with a prediction based on two-photon exchange using a GPD model and thus provides a new, independent constraint on these distributions.

UR - http://www.scopus.com/inward/record.url?scp=84945563977&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.115.172502

DO - 10.1103/PhysRevLett.115.172502

M3 - Article

AN - SCOPUS:84945563977

SN - 0031-9007

VL - 115

JO - Physical Review Letters

JF - Physical Review Letters

IS - 17

M1 - 172502

ER -

Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction He 3 ↑ (e,e′)

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