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Title: Measurement of the beam spin asymmetry of e p e ' p ' η in the deep-inelastic regime with CLAS

Abstract

The beam spin asymmetry of the exclusive pseudoscalar channel e p e ' p ' η was measured for the first time in the deep-inelastic regime (W > 2 GeV/c 2 and Q 2 > 1 GeV 2/c 2) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q 2, x Β, –t and Φ over a wide kinematic range, where Φ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. Furthermore, the experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); Science and Technologies Facilities Council (STFC-UK); National Science Foundation (NSF); Centre National de la Recherche Scientifique (CNRS); Commissariat a l’Energie Atomique (CEA); Instituto Nazionale di Fisica Nucleare (INFN); National Research Foundation of Korea (NRF)
Contributing Org.:
CLAS Collaboration
OSTI Identifier:
1489436
Alternate Identifier(s):
OSTI ID: 1494588; OSTI ID: 1494923
Report Number(s):
JLAB-PHY-19-2820; DOE/OR/23177-4643
Journal ID: ISSN 0370-2693; 148564
Grant/Contract Number:  
AC02-06CH11357; FG-04ER41309; FG02-96ER40950; AC05-06OR23177
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 789; 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

Citation Formats

Zhao, B., Kim, A., Joo, K., Bedlinskiy, I., Kim, W., Kubarovsky, V., Ungaro, M., Adhikari, S., Akbar, Z., Angelini, G., Avakian, H., Ball, J., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Batourine, V., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Clary, B. A., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Eugenio, P., Filippi, A., Forest, T. A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Johnston, S., Kabir, M. L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Klein, A., Klein, F. J., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., McKinnon, B., Meyer, C. A., Meziani, Z. E., Mirazita, M., Mokeev, V., Montgomery, R. A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Voskanyan, H., Voutier, E., Wang, R., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., and Zhao, Z. W. Measurement of the beam spin asymmetry of e→p→e'p'η in the deep-inelastic regime with CLAS. United States: N. p., 2019. Web. doi:10.1016/j.physletb.2018.12.065.
Zhao, B., Kim, A., Joo, K., Bedlinskiy, I., Kim, W., Kubarovsky, V., Ungaro, M., Adhikari, S., Akbar, Z., Angelini, G., Avakian, H., Ball, J., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Batourine, V., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Clary, B. A., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Eugenio, P., Filippi, A., Forest, T. A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Johnston, S., Kabir, M. L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Klein, A., Klein, F. J., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., McKinnon, B., Meyer, C. A., Meziani, Z. E., Mirazita, M., Mokeev, V., Montgomery, R. A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Voskanyan, H., Voutier, E., Wang, R., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., & Zhao, Z. W. Measurement of the beam spin asymmetry of e→p→e'p'η in the deep-inelastic regime with CLAS. United States. doi:10.1016/j.physletb.2018.12.065.
Zhao, B., Kim, A., Joo, K., Bedlinskiy, I., Kim, W., Kubarovsky, V., Ungaro, M., Adhikari, S., Akbar, Z., Angelini, G., Avakian, H., Ball, J., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Batourine, V., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Clary, B. A., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Eugenio, P., Filippi, A., Forest, T. A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Johnston, S., Kabir, M. L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Klein, A., Klein, F. J., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., McKinnon, B., Meyer, C. A., Meziani, Z. E., Mirazita, M., Mokeev, V., Montgomery, R. A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Voskanyan, H., Voutier, E., Wang, R., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., and Zhao, Z. W. Thu . "Measurement of the beam spin asymmetry of e→p→e'p'η in the deep-inelastic regime with CLAS". United States. doi:10.1016/j.physletb.2018.12.065.
@article{osti_1489436,
title = {Measurement of the beam spin asymmetry of e→p→e'p'η in the deep-inelastic regime with CLAS},
author = {Zhao, B. and Kim, A. and Joo, K. and Bedlinskiy, I. and Kim, W. and Kubarovsky, V. and Ungaro, M. and Adhikari, S. and Akbar, Z. and Angelini, G. and Avakian, H. and Ball, J. and Baltzell, N. A. and Barion, L. and Bashkanov, M. and Battaglieri, M. and Batourine, V. and Biselli, A. S. and Boiarinov, S. and Briscoe, W. J. and Brooks, W. K. and Burkert, V. D. and Carman, D. S. and Celentano, A. and Chatagnon, P. and Chetry, T. and Ciullo, G. and Clark, L. and Clary, B. A. 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 Diehl, S. and Djalali, C. and Dupre, R. and Egiyan, H. and Ehrhart, M. and El Alaoui, A. and El Fassi, L. and Eugenio, P. and Filippi, A. and Forest, T. A. and Gavalian, G. and Ghandilyan, Y. and Gilfoyle, G. P. and Girod, F. X. and Golovatch, E. and Gothe, R. W. and Griffioen, K. A. and Guidal, M. and Guo, L. and Hafidi, K. and Hakobyan, H. and Harrison, N. and Hattawy, M. and Heddle, D. and Hicks, K. and Holtrop, M. and Ilieva, Y. and Ireland, D. G. and Ishkhanov, B. S. and Isupov, E. L. and Jenkins, D. and Jo, H. S. and Johnston, S. and Kabir, M. L. and Keller, D. and Khachatryan, G. and Khachatryan, M. and Khandaker, M. and Klein, A. and Klein, F. J. and Kuhn, S. E. and Kuleshov, S. V. and Lanza, L. and Lenisa, P. and Livingston, K. and MacGregor, I. J. D. and Marchand, D. and Markov, N. and McKinnon, B. and Meyer, C. A. and Meziani, Z. E. 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 Ostrovidov, A. I. and Paolone, M. and Paremuzyan, R. and Park, K. and Pogorelko, O. and Price, J. W. and Prok, Y. and Protopopescu, D. and Ripani, M. and Rizzo, A. and Rosner, G. and Rossi, P. and Sabatié, F. and Salgado, C. and Schumacher, R. A. and Sharabian, Y. G. 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 Voskanyan, H. and Voutier, E. and Wang, R. and Wei, X. and Wood, M. H. and Zachariou, N. and Zhang, J. and Zhao, Z. W.},
abstractNote = {The beam spin asymmetry of the exclusive pseudoscalar channel e→p→e'p'η was measured for the first time in the deep-inelastic regime (W > 2 GeV/c2 and Q2 > 1 GeV2/c2) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q2, xΒ, –t and Φ over a wide kinematic range, where Φ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. Furthermore, the experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations.},
doi = {10.1016/j.physletb.2018.12.065},
journal = {Physics Letters. Section B},
issn = {0370-2693},
number = C,
volume = 789,
place = {United States},
year = {2019},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2018.12.065

Figures / Tables:

Fig. 1 Fig. 1: The leading-order handbag diagram of neutral pseudoscalar meson production. The symbol g represents the gluon that is exchanged between quark lines.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.