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Title: Target and double spin asymmetries of deeply virtual π 0 production with a longitudinally polarized proton target and CLAS

Abstract

The target and double spin asymmetries of the exclusive pseudoscalar channel $$\vec e\vec p\to ep\pi^0$$ were measured for the first time in the deep-inelastic regime using a longitudinally polarized 5.9 GeV electron beam and a longitudinally polarized proton target at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS). The data were collected over a large kinematic phase space and divided into 110 four-dimensional bins of $Q^2$, $$x_B$$, $-t$ and $$\phi$$. Large values of asymmetry moments clearly indicate a substantial contribution to the polarized structure functions from transverse virtual photon amplitudes. The interpretation of experimental data in terms of generalized parton distributions (GPDs) provides the first insight on the chiral-odd GPDs $$\tilde{H}_T$$ and $$E_T$$, and complement previous measurements of unpolarized structure functions sensitive to the GPDs $$H_T$$ and $$\bar E_T$$. Finally, these data provide necessary constraints for chiral-odd GPD parametrizations and will strongly influence existing theoretical handbag models.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); George Washington Univ., Washington, DC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1344582
Alternate Identifier(s):
OSTI ID: 1351109; OSTI ID: 1439852
Report Number(s):
JLAB-PHY-17-2440; DOE/OR/23177-4111; arXiv:1511.03338
Journal ID: ISSN 0370-2693; PII: S037026931730134X; TRN: US1700695
Grant/Contract Number:  
AC05-06OR23177; SC0016583
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 768; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; nucleon structure; CLAS collaboration; deeply virtual meson production; chiral-odd generalized parton distributions; longitudinally polarized target; inclusive reaction

Citation Formats

Kim, A., Avakian, H., Burkert, V., Joo, K., Kim, W., Adhikari, K. P., Akbar, Z., Anefalos Pereira, S., Badui, R. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Bosted, P., Briscoe, W. J., Brooks, W. K., Bültmann, S., Cao, T., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Chetry, T., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Djalali, C., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fleming, J. A., Fradi, A., Garc con, M., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hafidi, K., Hanretty, C., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Jenkins, D., Jiang, H., Jo, H. S., Joosten, S., Keller, D., Khachatryan, G., Khandaker, M., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mattione, P., McCracken, M. E., McKinnon, B., Mokeev, V., Movsisyan, A., Munevar, E., Nadel-Turonski, P., Net, L. A., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Paolone, M., Park, K., Pasyuk, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Salgado, C., Schumacher, R. A., Seder, E., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Sytnik, V., Taiuti, M., Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Watts, D. P., Wei, X., Weinstein, L. B., Zachariou, N., Zana, L., and Zhang, J. Target and double spin asymmetries of deeply virtual π0 production with a longitudinally polarized proton target and CLAS. United States: N. p., 2017. Web. doi:10.1016/j.physletb.2017.02.032.
Kim, A., Avakian, H., Burkert, V., Joo, K., Kim, W., Adhikari, K. P., Akbar, Z., Anefalos Pereira, S., Badui, R. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Bosted, P., Briscoe, W. J., Brooks, W. K., Bültmann, S., Cao, T., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Chetry, T., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Djalali, C., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fleming, J. A., Fradi, A., Garc con, M., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hafidi, K., Hanretty, C., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Jenkins, D., Jiang, H., Jo, H. S., Joosten, S., Keller, D., Khachatryan, G., Khandaker, M., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mattione, P., McCracken, M. E., McKinnon, B., Mokeev, V., Movsisyan, A., Munevar, E., Nadel-Turonski, P., Net, L. A., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Paolone, M., Park, K., Pasyuk, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Salgado, C., Schumacher, R. A., Seder, E., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Sytnik, V., Taiuti, M., Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Watts, D. P., Wei, X., Weinstein, L. B., Zachariou, N., Zana, L., & Zhang, J. Target and double spin asymmetries of deeply virtual π0 production with a longitudinally polarized proton target and CLAS. United States. doi:10.1016/j.physletb.2017.02.032.
Kim, A., Avakian, H., Burkert, V., Joo, K., Kim, W., Adhikari, K. P., Akbar, Z., Anefalos Pereira, S., Badui, R. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Bosted, P., Briscoe, W. J., Brooks, W. K., Bültmann, S., Cao, T., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Chetry, T., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Djalali, C., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fleming, J. A., Fradi, A., Garc con, M., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hafidi, K., Hanretty, C., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Jenkins, D., Jiang, H., Jo, H. S., Joosten, S., Keller, D., Khachatryan, G., Khandaker, M., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mattione, P., McCracken, M. E., McKinnon, B., Mokeev, V., Movsisyan, A., Munevar, E., Nadel-Turonski, P., Net, L. A., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Paolone, M., Park, K., Pasyuk, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Salgado, C., Schumacher, R. A., Seder, E., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Sytnik, V., Taiuti, M., Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Watts, D. P., Wei, X., Weinstein, L. B., Zachariou, N., Zana, L., and Zhang, J. Wed . "Target and double spin asymmetries of deeply virtual π0 production with a longitudinally polarized proton target and CLAS". United States. doi:10.1016/j.physletb.2017.02.032.
@article{osti_1344582,
title = {Target and double spin asymmetries of deeply virtual π0 production with a longitudinally polarized proton target and CLAS},
author = {Kim, A. and Avakian, H. and Burkert, V. and Joo, K. and Kim, W. and Adhikari, K. P. and Akbar, Z. and Anefalos Pereira, S. and Badui, R. A. and Battaglieri, M. and Batourine, V. and Bedlinskiy, I. and Biselli, A. S. and Boiarinov, S. and Bosted, P. and Briscoe, W. J. and Brooks, W. K. and Bültmann, S. and Cao, T. and Carman, D. S. and Celentano, A. and Chandavar, S. and Charles, G. and Chetry, T. and Colaneri, L. and Cole, P. L. and Compton, N. and Contalbrigo, M. and Cortes, O. and Crede, V. and D'Angelo, A. and Dashyan, N. and De Vita, R. and De Sanctis, E. and Djalali, C. and Egiyan, H. and El Alaoui, A. and El Fassi, L. and Eugenio, P. and Fedotov, G. and Fersch, R. and Filippi, A. and Fleming, J. A. and Fradi, A. and Garc con, M. and Ghandilyan, Y. and Gilfoyle, G. P. and Giovanetti, K. L. and Girod, F. X. and Gohn, W. and Golovatch, E. and Gothe, R. W. and Griffioen, K. A. and Guo, L. and Hafidi, K. and Hanretty, C. and Hattawy, M. and Heddle, D. and Hicks, K. and Holtrop, M. and Ilieva, Y. and Ireland, D. G. and Ishkhanov, B. S. and Jenkins, D. and Jiang, H. and Jo, H. S. and Joosten, S. and Keller, D. and Khachatryan, G. and Khandaker, M. and Klein, A. and Klein, F. J. and Kubarovsky, V. and Kuhn, S. E. and Kuleshov, S. V. and Lanza, L. and Lenisa, P. and Lu, H. Y. and MacGregor, I. J. D. and Markov, N. and Mattione, P. and McCracken, M. E. and McKinnon, B. and Mokeev, V. and Movsisyan, A. and Munevar, E. and Nadel-Turonski, P. and Net, L. A. and Niccolai, S. and Osipenko, M. and Ostrovidov, A. I. and Paolone, M. and Park, K. and Pasyuk, E. and Phelps, W. and Pisano, S. and Pogorelko, O. and Price, J. W. and Prok, Y. and Ripani, M. and Rizzo, A. and Rosner, G. and Rossi, P. and Roy, P. and Salgado, C. and Schumacher, R. A. and Seder, E. and Sharabian, Y. G. and Skorodumina, Iu. and Smith, G. D. 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 Torayev, B. and Ungaro, M. and Voskanyan, H. and Voutier, E. and Watts, D. P. and Wei, X. and Weinstein, L. B. and Zachariou, N. and Zana, L. and Zhang, J.},
abstractNote = {The target and double spin asymmetries of the exclusive pseudoscalar channel $\vec e\vec p\to ep\pi^0$ were measured for the first time in the deep-inelastic regime using a longitudinally polarized 5.9 GeV electron beam and a longitudinally polarized proton target at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS). The data were collected over a large kinematic phase space and divided into 110 four-dimensional bins of $Q^2$, $x_B$, $-t$ and $\phi$. Large values of asymmetry moments clearly indicate a substantial contribution to the polarized structure functions from transverse virtual photon amplitudes. The interpretation of experimental data in terms of generalized parton distributions (GPDs) provides the first insight on the chiral-odd GPDs $\tilde{H}_T$ and $E_T$, and complement previous measurements of unpolarized structure functions sensitive to the GPDs $H_T$ and $\bar E_T$. Finally, these data provide necessary constraints for chiral-odd GPD parametrizations and will strongly influence existing theoretical handbag models.},
doi = {10.1016/j.physletb.2017.02.032},
journal = {Physics Letters. Section B},
number = C,
volume = 768,
place = {United States},
year = {Wed Feb 22 00:00:00 EST 2017},
month = {Wed Feb 22 00:00:00 EST 2017}
}

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Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2017.02.032

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