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Title: Hard exclusive pion electroproduction at backward angles with CLAS

Abstract

We report on the first measurement of cross sections for exclusive deeply virtual pion electroproduction off the proton, $$e p \to e^\prime n \pi^+$$, above the resonance region at backward pion center-of-mass angles. The $$\varphi^*_{\pi}$$-dependent cross sections were measured, from which we extracted three combinations of structure functions of the proton. Our results are compatible with calculations based on nucleon-to-pion transition distribution amplitudes (TDAs) and shed new light on nucleon structure.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); George Washington Univ., Washington, DC (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); Italian Istituto Nazionale di Fisica Nucleare (INFN); French Centre National de la Recherche Scientifique (CNRS); French Commissariat à l'Energie Atomique; UK's Science and Technology Facilities Council; National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Org.:
CLAS Collaboration
OSTI Identifier:
1438395
Alternate Identifier(s):
OSTI ID: 1439889; OSTI ID: 1490279
Report Number(s):
JLAB-PHY-17-2598; DOE/OR/-23177-4261; arXiv:1711.08486; PLB33642
Journal ID: ISSN 0370-2693; PII: S0370269318302156; TRN: US1900431
Grant/Contract Number:  
AC05-06OR23177; SC0016583; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 780; 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; TDA; Exclusive single pion; Eletroproduction; CLAS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; pion electroproduction; Electroproduction

Citation Formats

Park, K., Guidal, M., Gothe, R. W., Pire, B., Semenov-Tian-Shansky, K., Laget, J. -M., Adhikari, K. P., Adhikari, S., Akbar, Z., Avakian, H., Ball, J., Balossino, I., Baltzell, N. A., Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, F. T., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Garçon, M., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Golovatch, E., Griffioen, K. A., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Johnston, S., Joo, K., Kabir, M. L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, W., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lanza, L., Livingston, K., MacGregor, I. J. D., Markov, N., McKinnon, B., Mirazita, M., Mokeev, V., Montgomery, R. A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Paolone, M., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Poudel, J., Price, J. W., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Ungaro, M., Voskanyan, H., Voutier, E., Wei, X., Zachariou, N., and Zhang, J. Hard exclusive pion electroproduction at backward angles with CLAS. United States: N. p., 2018. Web. doi:10.1016/j.physletb.2018.03.026.
Park, K., Guidal, M., Gothe, R. W., Pire, B., Semenov-Tian-Shansky, K., Laget, J. -M., Adhikari, K. P., Adhikari, S., Akbar, Z., Avakian, H., Ball, J., Balossino, I., Baltzell, N. A., Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, F. T., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Garçon, M., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Golovatch, E., Griffioen, K. A., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Johnston, S., Joo, K., Kabir, M. L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, W., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lanza, L., Livingston, K., MacGregor, I. J. D., Markov, N., McKinnon, B., Mirazita, M., Mokeev, V., Montgomery, R. A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Paolone, M., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Poudel, J., Price, J. W., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Ungaro, M., Voskanyan, H., Voutier, E., Wei, X., Zachariou, N., & Zhang, J. Hard exclusive pion electroproduction at backward angles with CLAS. United States. doi:10.1016/j.physletb.2018.03.026.
Park, K., Guidal, M., Gothe, R. W., Pire, B., Semenov-Tian-Shansky, K., Laget, J. -M., Adhikari, K. P., Adhikari, S., Akbar, Z., Avakian, H., Ball, J., Balossino, I., Baltzell, N. A., Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, F. T., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Garçon, M., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Golovatch, E., Griffioen, K. A., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Johnston, S., Joo, K., Kabir, M. L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, W., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lanza, L., Livingston, K., MacGregor, I. J. D., Markov, N., McKinnon, B., Mirazita, M., Mokeev, V., Montgomery, R. A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Paolone, M., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Poudel, J., Price, J. W., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Ungaro, M., Voskanyan, H., Voutier, E., Wei, X., Zachariou, N., and Zhang, J. Fri . "Hard exclusive pion electroproduction at backward angles with CLAS". United States. doi:10.1016/j.physletb.2018.03.026. https://www.osti.gov/servlets/purl/1438395.
@article{osti_1438395,
title = {Hard exclusive pion electroproduction at backward angles with CLAS},
author = {Park, K. and Guidal, M. and Gothe, R. W. and Pire, B. and Semenov-Tian-Shansky, K. and Laget, J. -M. and Adhikari, K. P. and Adhikari, S. and Akbar, Z. and Avakian, H. and Ball, J. and Balossino, I. and Baltzell, N. A. and Barion, L. and Battaglieri, M. and Bedlinskiy, I. and Biselli, A. S. and Briscoe, W. J. and Brooks, W. K. and Burkert, V. D. and Cao, F. T. and Carman, D. S. and Celentano, A. and Charles, G. and Chetry, T. and Ciullo, G. and Clark, L. and Cole, P. L. and Contalbrigo, M. and Crede, V. and D'Angelo, A. and Dashyan, N. and De Vita, R. and De Sanctis, E. and Defurne, M. and Deur, A. and Djalali, C. and Dupre, R. and Egiyan, H. and El Alaoui, A. and El Fassi, L. and Elouadrhiri, L. and Eugenio, P. and Fedotov, G. and Fersch, R. and Filippi, A. and Garçon, M. and Ghandilyan, Y. and Gilfoyle, G. P. and Girod, F. X. and Golovatch, E. and Griffioen, K. A. and Guo, L. and Hafidi, K. and Hakobyan, H. and Hanretty, C. and Harrison, N. and Hattawy, M. and Heddle, D. and Hicks, K. and Holtrop, M. and Hyde, C. E. and Ilieva, Y. and Ireland, D. G. and Ishkhanov, B. S. and Isupov, E. L. and Jenkins, D. and Johnston, S. and Joo, K. and Kabir, M. L. and Keller, D. and Khachatryan, G. and Khachatryan, M. and Khandaker, M. and Kim, W. and Klein, F. J. and Kubarovsky, V. and Kuhn, S. E. and Lanza, L. and Livingston, K. and MacGregor, I. J. D. and Markov, N. and McKinnon, B. and Mirazita, M. and Mokeev, V. and Montgomery, R. A. and Munoz Camacho, C. and Nadel-Turonski, P. and Niccolai, S. and Niculescu, G. and Osipenko, M. and Paolone, M. and Paremuzyan, R. and Pasyuk, E. and Phelps, W. and Pogorelko, O. and Poudel, J. and Price, J. W. and Prok, Y. and Protopopescu, D. and Ripani, M. and Rizzo, A. and Rossi, P. and Sabatié, F. and Salgado, C. and Schumacher, R. A. and Sharabian, Y. and Skorodumina, Iu. and Smith, G. D. and Sokhan, D. and Sparveris, N. and Stepanyan, S. and Strakovsky, I. I. and Strauch, S. and Taiuti, M. and Tan, J. A. and Ungaro, M. and Voskanyan, H. and Voutier, E. and Wei, X. and Zachariou, N. and Zhang, J.},
abstractNote = {We report on the first measurement of cross sections for exclusive deeply virtual pion electroproduction off the proton, $e p \to e^\prime n \pi^+$, above the resonance region at backward pion center-of-mass angles. The $\varphi^*_{\pi}$-dependent cross sections were measured, from which we extracted three combinations of structure functions of the proton. Our results are compatible with calculations based on nucleon-to-pion transition distribution amplitudes (TDAs) and shed new light on nucleon structure.},
doi = {10.1016/j.physletb.2018.03.026},
journal = {Physics Letters. Section B},
number = C,
volume = 780,
place = {United States},
year = {2018},
month = {3}
}

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Figures / Tables:

Fig. 1 Fig. 1: Left: QCD factorization mechanism for the exclusive electroproduction of a meson (π+) on the nucleon (proton) in the “nearly-forward” kinematic regime. At large Q2 and small |t|, the amplitude of the process can be presented as a convolution of a hard part calculable in perturbative QCD and twomore » general structure functions parametrizing the complex non-perturbative structure of the nucleon (the GPDs; bottom blob of the diagram) and of the meson (the pion DA upper blob of the diagram). Right: factorization mechanism for the same reaction in the complementary “nearly-backward” kinematic regime, where Q2 and W2 are large, xBJ is fixed and |u| is kept small. The amplitude of the process is written as the convolution of the hard interaction amplitude (calculable in perturbative QCD) involving the virtual photon, the three quarks of the out-going nucleon and two gluons, with two structure functions parametrizing the non-perturbative nucleon-to-pion transitions (TDAs) (bottom blob of the diagram) and the nucleon DA (upper blob of the diagram).« less

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