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Title: First Measurement of Hard Exclusive π − Δ + + Electroproduction Beam-Spin Asymmetries off the Proton

Abstract

The polarized cross-section ratio σLT' / σ0 from hard exclusive π– Δ++ electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV / 10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. The study, which provides the first observation of this channel in the deep-inelastic regime, focuses on very forward-pion kinematics in the valence regime, and photon virtualities ranging from 1.5 GeV2 up to 7 GeV2. The reaction provides a novel access to the d-quark content of the nucleon and to p → Δ++ transition generalized parton distributions. A comparison to existing results for hard exclusive π+n and π0p electroproduction is provided, which shows a clear impact of the excitation mechanism, encoded in transition generalized parton distributions, on the asymmetry.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. of Giessen (Germany); Univ. of Connecticut, Storrs, CT (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
CLAS Collaboration; CLAS collaboration
OSTI Identifier:
1989265
Alternate Identifier(s):
OSTI ID: 1989108; OSTI ID: 1989663
Report Number(s):
JLAB-PHY-23-3777; DOE/OR/23177-5785
Journal ID: ISSN 0031-9007; PRLTAO; 021901
Grant/Contract Number:  
AC05-06OR23177; FG02-04ER41309
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters Journal Volume: 131 Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Electron & positron scattering; Baryons; Mesons; Pions; electron scattering, nucleon structure, nucleon resonances, transition generalized parton distributions

Citation Formats

Diehl, S., Trotta, N., Joo, K., Achenbach, P., Akbar, Z., Armstrong, W. R., Atac, H., Avakian, H., Baashen, L., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bossù, F., Brinkmann, K. -T., Briscoe, W. J., Bulumulla, D., Burkert, V., Capobianco, R., Carman, D. S., Carvajal, J. C., Celentano, A., Charles, G., Chatagnon, P., Chesnokov, V., Ciullo, G., Cole, P. L., Contalbrigo, M., Costantini, G., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., Deur, A., Djalali, C., Dupre, R., Ehrhart, M., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Fegan, S., Filippi, A., Gavalian, G., Glazier, D. I., Golubenko, A. A., Gosta, G., Gothe, R. W., Gotra, Y., Griffioen, K., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Hobart, A., Holtrop, M., Illari, I., Ireland, D. G., Isupov, E. L., Jo, H. S., Johnston, R., Keller, D., Khachatryan, M., Khanal, A., Kim, A., Kim, W., Klimenko, V., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lagerquist, V., Lanza, L., Leali, M., Lee, S., Lenisa, P., Li, X., MacGregor, I. J. D., Marchand, D., Mascagna, V., Matousek, G., McKinnon, B., McLauchlin, C., Meziani, Z. E., Migliorati, S., Milner, R. G., Mineeva, T., Mirazita, M., Mokeev, V., Moran, P., Munoz Camacho, C., Naidoo, P., Neupane, K., Niccolai, S., Niculescu, G., Osipenko, M., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Paul, S. J., Phelps, W., Pilleux, N., Pokhrel, M., Poudel, J., Price, J. W., Prok, Y., Radic, A., Raue, B. A., Reed, T., Richards, J., Ripani, M., Ritman, J., Rossi, P., Sabatié, F., Salgado, C., Schadmand, S., Schmidt, A., Sharabian, Y. G., Shrestha, U., Sokhan, D., Sparveris, N., Spreafico, M., Stepanyan, S., Strakovsky, I., Strauch, S., Turisini, M., Tyson, R., Ungaro, M., Vallarino, S., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, X., Williams, R., Wishart, R., Wood, M. H., Yurov, M., Zachariou, N., Zhao, Z. W., Zurek, M., and CLAS Collaboration. First Measurement of Hard Exclusive π − Δ + + Electroproduction Beam-Spin Asymmetries off the Proton. United States: N. p., 2023. Web. doi:10.1103/PhysRevLett.131.021901.
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Diehl, S., Trotta, N., Joo, K., Achenbach, P., Akbar, Z., Armstrong, W. R., Atac, H., Avakian, H., Baashen, L., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bossù, F., Brinkmann, K. -T., Briscoe, W. J., Bulumulla, D., Burkert, V., Capobianco, R., Carman, D. S., Carvajal, J. C., Celentano, A., Charles, G., Chatagnon, P., Chesnokov, V., Ciullo, G., Cole, P. L., Contalbrigo, M., Costantini, G., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., Deur, A., Djalali, C., Dupre, R., Ehrhart, M., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Fegan, S., Filippi, A., Gavalian, G., Glazier, D. I., Golubenko, A. A., Gosta, G., Gothe, R. W., Gotra, Y., Griffioen, K., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Hobart, A., Holtrop, M., Illari, I., Ireland, D. G., Isupov, E. L., Jo, H. S., Johnston, R., Keller, D., Khachatryan, M., Khanal, A., Kim, A., Kim, W., Klimenko, V., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lagerquist, V., Lanza, L., Leali, M., Lee, S., Lenisa, P., Li, X., MacGregor, I. J. D., Marchand, D., Mascagna, V., Matousek, G., McKinnon, B., McLauchlin, C., Meziani, Z. E., Migliorati, S., Milner, R. G., Mineeva, T., Mirazita, M., Mokeev, V., Moran, P., Munoz Camacho, C., Naidoo, P., Neupane, K., Niccolai, S., Niculescu, G., Osipenko, M., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Paul, S. J., Phelps, W., Pilleux, N., Pokhrel, M., Poudel, J., Price, J. W., Prok, Y., Radic, A., Raue, B. A., Reed, T., Richards, J., Ripani, M., Ritman, J., Rossi, P., Sabatié, F., Salgado, C., Schadmand, S., Schmidt, A., Sharabian, Y. G., Shrestha, U., Sokhan, D., Sparveris, N., Spreafico, M., Stepanyan, S., Strakovsky, I., Strauch, S., Turisini, M., Tyson, R., Ungaro, M., Vallarino, S., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, X., Williams, R., Wishart, R., Wood, M. H., Yurov, M., Zachariou, N., Zhao, Z. W., Zurek, M., & CLAS Collaboration. First Measurement of Hard Exclusive π − Δ + + Electroproduction Beam-Spin Asymmetries off the Proton. United States. https://doi.org/10.1103/PhysRevLett.131.021901
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Diehl, S., Trotta, N., Joo, K., Achenbach, P., Akbar, Z., Armstrong, W. R., Atac, H., Avakian, H., Baashen, L., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bossù, F., Brinkmann, K. -T., Briscoe, W. J., Bulumulla, D., Burkert, V., Capobianco, R., Carman, D. S., Carvajal, J. C., Celentano, A., Charles, G., Chatagnon, P., Chesnokov, V., Ciullo, G., Cole, P. L., Contalbrigo, M., Costantini, G., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., Deur, A., Djalali, C., Dupre, R., Ehrhart, M., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Fegan, S., Filippi, A., Gavalian, G., Glazier, D. I., Golubenko, A. A., Gosta, G., Gothe, R. W., Gotra, Y., Griffioen, K., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T. B., Heddle, D., Hobart, A., Holtrop, M., Illari, I., Ireland, D. G., Isupov, E. L., Jo, H. S., Johnston, R., Keller, D., Khachatryan, M., Khanal, A., Kim, A., Kim, W., Klimenko, V., Kripko, A., Kubarovsky, V., Kuhn, S. E., Lagerquist, V., Lanza, L., Leali, M., Lee, S., Lenisa, P., Li, X., MacGregor, I. J. D., Marchand, D., Mascagna, V., Matousek, G., McKinnon, B., McLauchlin, C., Meziani, Z. E., Migliorati, S., Milner, R. G., Mineeva, T., Mirazita, M., Mokeev, V., Moran, P., Munoz Camacho, C., Naidoo, P., Neupane, K., Niccolai, S., Niculescu, G., Osipenko, M., Pandey, P., Paolone, M., Pappalardo, L. L., Paremuzyan, R., Paul, S. J., Phelps, W., Pilleux, N., Pokhrel, M., Poudel, J., Price, J. W., Prok, Y., Radic, A., Raue, B. A., Reed, T., Richards, J., Ripani, M., Ritman, J., Rossi, P., Sabatié, F., Salgado, C., Schadmand, S., Schmidt, A., Sharabian, Y. G., Shrestha, U., Sokhan, D., Sparveris, N., Spreafico, M., Stepanyan, S., Strakovsky, I., Strauch, S., Turisini, M., Tyson, R., Ungaro, M., Vallarino, S., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D. P., Wei, X., Williams, R., Wishart, R., Wood, M. H., Yurov, M., Zachariou, N., Zhao, Z. W., Zurek, M., and CLAS Collaboration. Tue . "First Measurement of Hard Exclusive π − Δ + + Electroproduction Beam-Spin Asymmetries off the Proton". United States. https://doi.org/10.1103/PhysRevLett.131.021901.
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@article{osti_1989265,
title = {First Measurement of Hard Exclusive π − Δ + + Electroproduction Beam-Spin Asymmetries off the Proton},
author = {Diehl, S. and Trotta, N. and Joo, K. and Achenbach, P. and Akbar, Z. and Armstrong, W. R. and Atac, H. and Avakian, H. and Baashen, L. and Baltzell, N. A. and Barion, L. and Bashkanov, M. and Battaglieri, M. and Bedlinskiy, I. and Benmokhtar, F. and Bianconi, A. and Biselli, A. S. and Bossù, F. and Brinkmann, K. -T. and Briscoe, W. J. and Bulumulla, D. and Burkert, V. and Capobianco, R. and Carman, D. S. and Carvajal, J. C. and Celentano, A. and Charles, G. and Chatagnon, P. and Chesnokov, V. and Ciullo, G. and Cole, P. L. and Contalbrigo, M. and Costantini, G. and Crede, V. and D’Angelo, A. and Dashyan, N. and De Vita, R. and Deur, A. and Djalali, C. and Dupre, R. and Ehrhart, M. and El Alaoui, A. and El Fassi, L. and Elouadrhiri, L. and Fegan, S. and Filippi, A. and Gavalian, G. and Glazier, D. I. and Golubenko, A. A. and Gosta, G. and Gothe, R. W. and Gotra, Y. and Griffioen, K. and Hafidi, K. and Hakobyan, H. and Hattawy, M. and Hayward, T. B. and Heddle, D. and Hobart, A. and Holtrop, M. and Illari, I. and Ireland, D. G. and Isupov, E. L. and Jo, H. S. and Johnston, R. and Keller, D. and Khachatryan, M. and Khanal, A. and Kim, A. and Kim, W. and Klimenko, V. and Kripko, A. and Kubarovsky, V. and Kuhn, S. E. and Lagerquist, V. and Lanza, L. and Leali, M. and Lee, S. and Lenisa, P. and Li, X. and MacGregor, I. J. D. and Marchand, D. and Mascagna, V. and Matousek, G. and McKinnon, B. and McLauchlin, C. and Meziani, Z. E. and Migliorati, S. and Milner, R. G. and Mineeva, T. and Mirazita, M. and Mokeev, V. and Moran, P. and Munoz Camacho, C. and Naidoo, P. and Neupane, K. and Niccolai, S. and Niculescu, G. and Osipenko, M. and Pandey, P. and Paolone, M. and Pappalardo, L. L. and Paremuzyan, R. and Paul, S. J. and Phelps, W. and Pilleux, N. and Pokhrel, M. and Poudel, J. and Price, J. W. and Prok, Y. and Radic, A. and Raue, B. A. and Reed, T. and Richards, J. and Ripani, M. and Ritman, J. and Rossi, P. and Sabatié, F. and Salgado, C. and Schadmand, S. and Schmidt, A. and Sharabian, Y. G. and Shrestha, U. and Sokhan, D. and Sparveris, N. and Spreafico, M. and Stepanyan, S. and Strakovsky, I. and Strauch, S. and Turisini, M. and Tyson, R. and Ungaro, M. and Vallarino, S. and Venturelli, L. and Voskanyan, H. and Voutier, E. and Watts, D. P. and Wei, X. and Williams, R. and Wishart, R. and Wood, M. H. and Yurov, M. and Zachariou, N. and Zhao, Z. W. and Zurek, M. and CLAS Collaboration},
abstractNote = {The polarized cross-section ratio σLT' / σ0 from hard exclusive π– Δ++ electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV / 10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. The study, which provides the first observation of this channel in the deep-inelastic regime, focuses on very forward-pion kinematics in the valence regime, and photon virtualities ranging from 1.5 GeV2 up to 7 GeV2. The reaction provides a novel access to the d-quark content of the nucleon and to p → Δ++ transition generalized parton distributions. A comparison to existing results for hard exclusive π+n and π0p electroproduction is provided, which shows a clear impact of the excitation mechanism, encoded in transition generalized parton distributions, on the asymmetry.},
doi = {10.1103/PhysRevLett.131.021901},
journal = {Physical Review Letters},
number = 2,
volume = 131,
place = {United States},
year = {Tue Jul 11 00:00:00 EDT 2023},
month = {Tue Jul 11 00:00:00 EDT 2023}
}
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