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Title: Longitudinal target-spin asymmetries for deeply virtual Compton scattering

Abstract

A measurement of the electroproduction of photons off protons in the deeply inelastic regime was performed at Jefferson Lab using a nearly 6-GeV electron beam, a longitudinally polarized proton target and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep → e'p'y events, which arise from the interference of the deeply virtual Compton scattering and the Bethe-Heitler processes, were extracted over the widest kinematics in Q 2, x B, t and Φ, for 166 four-dimensional bins. In the framework of Generalized Parton Distributions (GPDs), at leading twist the t dependence of these asymmetries provides insight on the spatial distribution of the axial charge of the proton, which appears to be concentrated in its center. In conclusion, these results bring important and necessary constraints for the existing parametrizations of chiral-even GPDs.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1167672
Alternate Identifier(s):
OSTI ID: 1180421
Report Number(s):
JLAB/PHY-14-1978; DOE/OR/23177-3211
Journal ID: ISSN 0031-9007; PRLTAO; ArticleNumber: 032001; FG02-96ER40950; TRN: US1600759
Grant/Contract Number:
FG02-96ER40950; AC05-06OR23177
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 3; 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

Seder, E., Biselli, A., Pisano, S., Niccolai, S., Smith, G. D., Joo, K., Adhikari, K., Amaryan, M. J., Anderson, M. D., Anefalos Pereira, S., Avakian, H., Battaglieri, M., Bedlinskiy, I., Bono, J., Boiarinov, S., Bosted, P., Briscoe, W., Brock, J., Brooks, W. K., Bültmann, S., Burkert, V. D., Carman, D. S., Carlin, C., Celentano, A., Chandavar, S., Charles, G., Colaneri, L., Cole, P. L., Contalbrigo, M., Crabb, D., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J. A., Fradi, A., Garillon, B., Garçon, M., Gevorgyan, N., Ghandilyan, Y., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Gothe, R. W., Griffioen, K. A., Guegan, B., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hirlinger Saylor, N., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joosten, S., Keith, C. D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mayer, M., McKinnon, B., Meekins, D. G., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R., Moody, C. I., Moutarde, H., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L. L., Park, K., Park, S., Pasyuk, E., Peng, P., Phelps, W., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J. R., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Salgado, C., Schott, D., Schumacher, R. A., Senderovich, I., Simonyan, A., Skorodumina, I., Sokhan, D., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Sytnik, V., Taiuti, M., Tang, W., Tian, Y., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., and Zonta, I. Longitudinal target-spin asymmetries for deeply virtual Compton scattering. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.114.032001.
Seder, E., Biselli, A., Pisano, S., Niccolai, S., Smith, G. D., Joo, K., Adhikari, K., Amaryan, M. J., Anderson, M. D., Anefalos Pereira, S., Avakian, H., Battaglieri, M., Bedlinskiy, I., Bono, J., Boiarinov, S., Bosted, P., Briscoe, W., Brock, J., Brooks, W. K., Bültmann, S., Burkert, V. D., Carman, D. S., Carlin, C., Celentano, A., Chandavar, S., Charles, G., Colaneri, L., Cole, P. L., Contalbrigo, M., Crabb, D., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J. A., Fradi, A., Garillon, B., Garçon, M., Gevorgyan, N., Ghandilyan, Y., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Gothe, R. W., Griffioen, K. A., Guegan, B., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hirlinger Saylor, N., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joosten, S., Keith, C. D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mayer, M., McKinnon, B., Meekins, D. G., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R., Moody, C. I., Moutarde, H., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L. L., Park, K., Park, S., Pasyuk, E., Peng, P., Phelps, W., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J. R., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Salgado, C., Schott, D., Schumacher, R. A., Senderovich, I., Simonyan, A., Skorodumina, I., Sokhan, D., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Sytnik, V., Taiuti, M., Tang, W., Tian, Y., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., & Zonta, I. Longitudinal target-spin asymmetries for deeply virtual Compton scattering. United States. doi:10.1103/PhysRevLett.114.032001.
Seder, E., Biselli, A., Pisano, S., Niccolai, S., Smith, G. D., Joo, K., Adhikari, K., Amaryan, M. J., Anderson, M. D., Anefalos Pereira, S., Avakian, H., Battaglieri, M., Bedlinskiy, I., Bono, J., Boiarinov, S., Bosted, P., Briscoe, W., Brock, J., Brooks, W. K., Bültmann, S., Burkert, V. D., Carman, D. S., Carlin, C., Celentano, A., Chandavar, S., Charles, G., Colaneri, L., Cole, P. L., Contalbrigo, M., Crabb, D., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J. A., Fradi, A., Garillon, B., Garçon, M., Gevorgyan, N., Ghandilyan, Y., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Gothe, R. W., Griffioen, K. A., Guegan, B., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hirlinger Saylor, N., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joosten, S., Keith, C. D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mayer, M., McKinnon, B., Meekins, D. G., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R., Moody, C. I., Moutarde, H., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Pappalardo, L. L., Park, K., Park, S., Pasyuk, E., Peng, P., Phelps, W., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J. R., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatié, F., Salgado, C., Schott, D., Schumacher, R. A., Senderovich, I., Simonyan, A., Skorodumina, I., Sokhan, D., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Sytnik, V., Taiuti, M., Tang, W., Tian, Y., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., and Zonta, I. Thu . "Longitudinal target-spin asymmetries for deeply virtual Compton scattering". United States. doi:10.1103/PhysRevLett.114.032001. https://www.osti.gov/servlets/purl/1167672.
@article{osti_1167672,
title = {Longitudinal target-spin asymmetries for deeply virtual Compton scattering},
author = {Seder, E. and Biselli, A. and Pisano, S. and Niccolai, S. and Smith, G. D. and Joo, K. and Adhikari, K. and Amaryan, M. J. and Anderson, M. D. and Anefalos Pereira, S. and Avakian, H. and Battaglieri, M. and Bedlinskiy, I. and Bono, J. and Boiarinov, S. and Bosted, P. and Briscoe, W. and Brock, J. and Brooks, W. K. and Bültmann, S. and Burkert, V. D. and Carman, D. S. and Carlin, C. and Celentano, A. and Chandavar, S. and Charles, G. and Colaneri, L. and Cole, P. L. and Contalbrigo, M. and Crabb, D. and Crede, V. and D’Angelo, A. and Dashyan, N. and De Vita, R. and De Sanctis, E. and Deur, A. and Djalali, C. and Doughty, D. and Dupre, R. and El Fassi, L. and Elouadrhiri, L. and Eugenio, P. and Fedotov, G. and Fegan, S. and Filippi, A. and Fleming, J. A. and Fradi, A. and Garillon, B. and Garçon, M. and Gevorgyan, N. and Ghandilyan, Y. and Giovanetti, K. L. and Girod, F. X. and Goetz, J. T. and Gohn, W. and Gothe, R. W. and Griffioen, K. A. and Guegan, B. and Guidal, M. and Guo, L. and Hafidi, K. and Hakobyan, H. and Hanretty, C. and Harrison, N. and Hattawy, M. and Hirlinger Saylor, N. and Holtrop, M. and Hughes, S. M. and Ilieva, Y. and Ireland, D. G. and Ishkhanov, B. S. and Isupov, E. L. and Jo, H. S. and Joosten, S. and Keith, C. D. and Keller, D. and Khachatryan, G. and Khandaker, M. and Kim, A. and Kim, W. and Klein, A. and Klein, F. J. and Koirala, S. and Kubarovsky, V. and Kuhn, S. E. and Lenisa, P. and Livingston, K. and Lu, H. Y. and MacGregor, I. J. D. and Markov, N. and Mayer, M. and McKinnon, B. and Meekins, D. G. and Mineeva, T. and Mirazita, M. and Mokeev, V. and Montgomery, R. and Moody, C. I. and Moutarde, H. and Movsisyan, A. and Munoz Camacho, C. and Nadel-Turonski, P. and Niculescu, I. and Osipenko, M. and Ostrovidov, A. I. and Paolone, M. and Pappalardo, L. L. and Park, K. and Park, S. and Pasyuk, E. and Peng, P. and Phelps, W. and Pogorelko, O. and Price, J. W. and Prok, Y. and Protopopescu, D. and Puckett, A. J. R. and Ripani, M. and Rizzo, A. and Rosner, G. and Rossi, P. and Roy, P. and Sabatié, F. and Salgado, C. and Schott, D. and Schumacher, R. A. and Senderovich, I. and Simonyan, A. and Skorodumina, I. and Sokhan, D. and Sparveris, N. and Stepanyan, S. and Stoler, P. and Strakovsky, I. I. and Strauch, S. and Sytnik, V. and Taiuti, M. and Tang, W. and Tian, Y. and Ungaro, M. and Voskanyan, H. and Voutier, E. and Walford, N. K. and Watts, D. P. and Wei, X. and Weinstein, L. B. and Wood, M. H. and Zachariou, N. and Zana, L. and Zhang, J. and Zonta, I.},
abstractNote = {A measurement of the electroproduction of photons off protons in the deeply inelastic regime was performed at Jefferson Lab using a nearly 6-GeV electron beam, a longitudinally polarized proton target and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep → e'p'y events, which arise from the interference of the deeply virtual Compton scattering and the Bethe-Heitler processes, were extracted over the widest kinematics in Q2, xB, t and Φ, for 166 four-dimensional bins. In the framework of Generalized Parton Distributions (GPDs), at leading twist the t dependence of these asymmetries provides insight on the spatial distribution of the axial charge of the proton, which appears to be concentrated in its center. In conclusion, these results bring important and necessary constraints for the existing parametrizations of chiral-even GPDs.},
doi = {10.1103/PhysRevLett.114.032001},
journal = {Physical Review Letters},
number = 3,
volume = 114,
place = {United States},
year = {Thu Jan 22 00:00:00 EST 2015},
month = {Thu Jan 22 00:00:00 EST 2015}
}

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  • Single-beam, single-target, and double-spin asymmetries for hard exclusive photon production on the proton e→p→e'p'γ are presented. The data were taken at Jefferson Lab using the CLAS detector and a longitudinally polarized 14NH 3 target. The three asymmetries were measured in 165 4-dimensional kinematic bins, covering the widest kinematic range ever explored simultaneously for beam and target-polarization observables in the valence quark region. The kinematic dependences of the obtained asymmetries are discussed and compared to the predictions of models of Generalized Parton Distributions. As a result, the measurement of three DVCS spin observables at the same kinematic points allows a quasi-model-independentmore » extraction of the imaginary parts of the H and H~ Compton Form Factors, which give insight into the electric and axial charge distributions of valence quarks in the proton.« less
  • The beam spin asymmetries in the hard exclusive electroproduction of photons on the proton (ep -> epg) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler process and of deeply virtual Compton scattering. Over the whole kinematic range (x_B from 0.11 to 0.58, Q^2 from 1 to 4.8 GeV^2, -t from 0.09 to 1.8 GeV^2), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A = a*sin(phi)/[1+c*cos(phi)]. This extensive set of data can thus be used to constrain significantly the generalized parton distributions ofmore » the nucleon in the valence quark sector.« less
  • The beam-spin asymmetries in the hard exclusive electroproduction of photons on the proton (e-vectorp{yields}ep{gamma}) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler process and of deeply virtual Compton scattering. Over the whole kinematic range (x{sub B} from 0.11 to 0.58, Q{sup 2} from 1 to 4.8 GeV{sup 2}, -t from 0.09 to 1.8 GeV{sup 2}), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A{approx_equal}asin{phi}/(1+ccos{phi}). This extensive set of data can thus be used to constrain significantly the generalized parton distributions of themore » nucleon in the valence quark sector.« less