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1. Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering

Author

Hattawy, M., Baltzell, N. A., Dupré, R., Bültmann, S., De Vita, R., Alaoui, A. El, Fassi, L. El, Egiyan, H., Girod, F. X., Guidal, M., Hafidi, K., Jenkins, D., Liuti, S., Perrin, Y., Stepanyan, S., Torayev, B., Voutier, E., Adhikari, S., Angelini, Giovanni, Gayoso, C. Ayerbe, Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Bossù, F., Brooks, W., Cao, F., Carman, D. S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Sanctis, E., Defurne, M., Deur, A., Diehl, S., Djalali, C., Ehrhart, M., Eugenio, P., Fegan, S., Filippi, A., Forest, T. A., Fradi, A., Garçon, M., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Golovatch, E., Gothe, R. W., Griffioen, K. A., Harrison, N., Hauenstein, F., Hayward, T. B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Johnston, S., Keller, D., Khachatryan, G., Khachatryan, M., Khanal, A., Khandaker, M., Kim, C. W., Kim, W., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lanza, L., Kabir, M. L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., Mayer, M., McKinnon, B., Meziani, Z. E., Mineeva, T., Mirazita, M., Montgomery, R. A., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Pogorelko, O., Poudel, J., Prok, Y., Protopopescu, D., Ripani, M., Riser, D., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Sokhan, D., Soto, O., Sparveris, N., Strauch, S., Taiuti, M., Tan, J. A., Tyler, N., Ungaro, M., Voskanyan, H., Wang, R., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., Hattawy, M., Baltzell, N. A., Dupré, R., Bültmann, S., De Vita, R., Alaoui, A. El, Fassi, L. El, Egiyan, H., Girod, F. X., Guidal, M., Hafidi, K., Jenkins, D., Liuti, S., Perrin, Y., Stepanyan, S., Torayev, B., Voutier, E., Adhikari, S., Angelini, Giovanni, Gayoso, C. Ayerbe, Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Bossù, F., Brooks, W., Cao, F., Carman, D. S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Sanctis, E., Defurne, M., Deur, A., Diehl, S., Djalali, C., Ehrhart, M., Eugenio, P., Fegan, S., Filippi, A., Forest, T. A., Fradi, A., Garçon, M., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Golovatch, E., Gothe, R. W., Griffioen, K. A., Harrison, N., Hauenstein, F., Hayward, T. B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Johnston, S., Keller, D., Khachatryan, G., Khachatryan, M., Khanal, A., Khandaker, M., Kim, C. W., Kim, W., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lanza, L., Kabir, M. L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., Mayer, M., McKinnon, B., Meziani, Z. E., Mineeva, T., Mirazita, M., Montgomery, R. A., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Pogorelko, O., Poudel, J., Prok, Y., Protopopescu, D., Ripani, M., Riser, D., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Sokhan, D., Soto, O., Sparveris, N., Strauch, S., Taiuti, M., Tan, J. A., Tyler, N., Ungaro, M., Voskanyan, H., Wang, R., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zhang, J., and Zhao, Z. W.

Abstract

In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal momentum of quarks inside the nucleon. Meanwhile, the structure of bound nucleons in nuclei has been studied in inclusive deep-inelastic lepton scattering experiments off nuclear targets, showing a significant difference in longitudinal momentum distribution of quarks inside the bound nucleon, known as the EMC effect. In this work, we report the first beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton scattering (DVCS) off a proton bound in $^4$He. The data used here were accumulated using a $6$ GeV longitudinally polarized electron beam incident on a pressurized $^4$He gaseous target placed within the CLAS spectrometer in Hall-B at the Thomas Jefferson National Accelerator Facility. The azimuthal angle ($\phi$) dependence of the BSA was studied in a wide range of virtual photon and scattered proton kinematics. The $Q^2$, $x_B$, and t dependencies of the BSA on the bound proton are compared with those on the free proton. In the whole kinematical region of our measurements, the BSA on the bound proton is smaller by 20\% to 40\%, indicating possible medium modification of its partonic structure.

Published
2018
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2. Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering

Author

Hattawy, M., Baltzell, N. A., Dupré, R., Bültmann, S., De Vita, R., Alaoui, A. El, Fassi, L. El, Egiyan, H., Girod, F. X., Guidal, M., Hafidi, K., Jenkins, D., Liuti, S., Perrin, Y., Stepanyan, S., Torayev, B., Voutier, E., Adhikari, S., Angelini, Giovanni, Gayoso, C. Ayerbe, Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Bossù, F., Brooks, W., Cao, F., Carman, D. S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Sanctis, E., Defurne, M., Deur, A., Diehl, S., Djalali, C., Ehrhart, M., Eugenio, P., Fegan, S., Filippi, A., Forest, T. A., Fradi, A., Garçon, M., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Golovatch, E., Gothe, R. W., Griffioen, K. A., Harrison, N., Hauenstein, F., Hayward, T. B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Johnston, S., Keller, D., Khachatryan, G., Khachatryan, M., Khanal, A., Khandaker, M., Kim, C. W., Kim, W., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lanza, L., Kabir, M. L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., Mayer, M., McKinnon, B., Meziani, Z. E., Mineeva, T., Mirazita, M., Montgomery, R. A., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Pogorelko, O., Poudel, J., Prok, Y., Protopopescu, D., Ripani, M., Riser, D., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Sokhan, D., Soto, O., Sparveris, N., Strauch, S., Taiuti, M., Tan, J. A., Tyler, N., Ungaro, M., Voskanyan, H., Wang, R., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., Hattawy, M., Baltzell, N. A., Dupré, R., Bültmann, S., De Vita, R., Alaoui, A. El, Fassi, L. El, Egiyan, H., Girod, F. X., Guidal, M., Hafidi, K., Jenkins, D., Liuti, S., Perrin, Y., Stepanyan, S., Torayev, B., Voutier, E., Adhikari, S., Angelini, Giovanni, Gayoso, C. Ayerbe, Barion, L., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Bossù, F., Brooks, W., Cao, F., Carman, D. S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Sanctis, E., Defurne, M., Deur, A., Diehl, S., Djalali, C., Ehrhart, M., Eugenio, P., Fegan, S., Filippi, A., Forest, T. A., Fradi, A., Garçon, M., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Golovatch, E., Gothe, R. W., Griffioen, K. A., Harrison, N., Hauenstein, F., Hayward, T. B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Johnston, S., Keller, D., Khachatryan, G., Khachatryan, M., Khanal, A., Khandaker, M., Kim, C. W., Kim, W., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lanza, L., Kabir, M. L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Marchand, D., Markov, N., Mayer, M., McKinnon, B., Meziani, Z. E., Mineeva, T., Mirazita, M., Montgomery, R. A., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Pasyuk, E., Pogorelko, O., Poudel, J., Prok, Y., Protopopescu, D., Ripani, M., Riser, D., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu., Sokhan, D., Soto, O., Sparveris, N., Strauch, S., Taiuti, M., Tan, J. A., Tyler, N., Ungaro, M., Voskanyan, H., Wang, R., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zhang, J., and Zhao, Z. W.

Abstract

In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal momentum of quarks inside the nucleon. Meanwhile, the structure of bound nucleons in nuclei has been studied in inclusive deep-inelastic lepton scattering experiments off nuclear targets, showing a significant difference in longitudinal momentum distribution of quarks inside the bound nucleon, known as the EMC effect. In this work, we report the first beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton scattering (DVCS) off a proton bound in $^4$He. The data used here were accumulated using a $6$ GeV longitudinally polarized electron beam incident on a pressurized $^4$He gaseous target placed within the CLAS spectrometer in Hall-B at the Thomas Jefferson National Accelerator Facility. The azimuthal angle ($\phi$) dependence of the BSA was studied in a wide range of virtual photon and scattered proton kinematics. The $Q^2$, $x_B$, and t dependencies of the BSA on the bound proton are compared with those on the free proton. In the whole kinematical region of our measurements, the BSA on the bound proton is smaller by 20\% to 40\%, indicating possible medium modification of its partonic structure.

Published
2018
Full Text
View/download PDF

3. First Exclusive Measurement of Deeply Virtual Compton Scattering off $^4$He: Toward the 3D Tomography of Nuclei

Author

Hattawy, M., Baltzell, N. A., Dupré, R., Hafidi, K., Stepanyan, S., Bültmann, S., De Vita, R., Alaoui, A. El, Fassi, L. El, Egiyan, H., Girod, F. X., Guidal, M., Jenkins, D., Liuti, S., Perrin, Y., Torayev, B., Voutier, E., Adhikari, K. P., Adhikari, S., Adikaram, D., Akbar, Z., Amaryan, M. J., Pereira, S. Anefalos, Armstrong, Whitney R., Avakian, H., Ball, J., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, Frank Thanh, Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Sanctis, E., Deur, A., Djalali, C., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Filippi, A., Fleming, J. A., Forest, T. A., Fradi, A., Garçon, M., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Hicks, K., Holtrop, M., Hughes, S. M., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, H., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I . J . D., Markov, N., Mayer, M., McCracken, M. E., McKinnon, B., Meyer, C. A., Meziani, Z. E., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Moutarde, H., Movsisyan, A, Camacho, C. Munoz, Nadel-Turonski, P., Net, L. A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Seder, E., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z. W., Hattawy, M., Baltzell, N. A., Dupré, R., Hafidi, K., Stepanyan, S., Bültmann, S., De Vita, R., Alaoui, A. El, Fassi, L. El, Egiyan, H., Girod, F. X., Guidal, M., Jenkins, D., Liuti, S., Perrin, Y., Torayev, B., Voutier, E., Adhikari, K. P., Adhikari, S., Adikaram, D., Akbar, Z., Amaryan, M. J., Pereira, S. Anefalos, Armstrong, Whitney R., Avakian, H., Ball, J., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, Frank Thanh, Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Sanctis, E., Deur, A., Djalali, C., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Filippi, A., Fleming, J. A., Forest, T. A., Fradi, A., Garçon, M., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Hicks, K., Holtrop, M., Hughes, S. M., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, H., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I . J . D., Markov, N., Mayer, M., McCracken, M. E., McKinnon, B., Meyer, C. A., Meziani, Z. E., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Moutarde, H., Movsisyan, A, Camacho, C. Munoz, Nadel-Turonski, P., Net, L. A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Seder, E., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., and Zhao, Z. W.

Abstract

We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment used the 6 GeV electron beam from the CEBAF accelerator at Jefferson Lab incident on a pressurized $^4$He gaseous target placed in front of the CEBAF Large Acceptance Spectrometer (CLAS). The scattered electron was detected by CLAS and the photon by a dedicated electromagnetic calorimeter at forward angles. To ensure the exclusivity of the process, a specially designed radial time projection chamber was used to detect the recoiling $^4$He nuclei. We measured beam-spin asymmetries larger than those observed on the free proton in the same kinematic domain. From these, we were able to extract, in a model-independent way, the real and imaginary parts of the only $^4$He Compton form factor, $\cal H_A$. This first measurement of coherent deeply virtual Compton scattering on the $^4$He nucleus, with a fully exclusive final state via nuclear recoil tagging, leads the way toward 3D imaging of the partonic structure of nuclei.

Published
2017
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4. First Exclusive Measurement of Deeply Virtual Compton Scattering off $^4$He: Toward the 3D Tomography of Nuclei

Author

Hattawy, M., Baltzell, N. A., Dupré, R., Hafidi, K., Stepanyan, S., Bültmann, S., De Vita, R., Alaoui, A. El, Fassi, L. El, Egiyan, H., Girod, F. X., Guidal, M., Jenkins, D., Liuti, S., Perrin, Y., Torayev, B., Voutier, E., Adhikari, K. P., Adhikari, S., Adikaram, D., Akbar, Z., Amaryan, M. J., Pereira, S. Anefalos, Armstrong, Whitney R., Avakian, H., Ball, J., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, Frank Thanh, Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Sanctis, E., Deur, A., Djalali, C., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Filippi, A., Fleming, J. A., Forest, T. A., Fradi, A., Garçon, M., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Hicks, K., Holtrop, M., Hughes, S. M., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, H., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I . J . D., Markov, N., Mayer, M., McCracken, M. E., McKinnon, B., Meyer, C. A., Meziani, Z. E., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Moutarde, H., Movsisyan, A, Camacho, C. Munoz, Nadel-Turonski, P., Net, L. A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Seder, E., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z. W., Hattawy, M., Baltzell, N. A., Dupré, R., Hafidi, K., Stepanyan, S., Bültmann, S., De Vita, R., Alaoui, A. El, Fassi, L. El, Egiyan, H., Girod, F. X., Guidal, M., Jenkins, D., Liuti, S., Perrin, Y., Torayev, B., Voutier, E., Adhikari, K. P., Adhikari, S., Adikaram, D., Akbar, Z., Amaryan, M. J., Pereira, S. Anefalos, Armstrong, Whitney R., Avakian, H., Ball, J., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, Frank Thanh, Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Sanctis, E., Deur, A., Djalali, C., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Filippi, A., Fleming, J. A., Forest, T. A., Fradi, A., Garçon, M., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Hicks, K., Holtrop, M., Hughes, S. M., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, H., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I . J . D., Markov, N., Mayer, M., McCracken, M. E., McKinnon, B., Meyer, C. A., Meziani, Z. E., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Moutarde, H., Movsisyan, A, Camacho, C. Munoz, Nadel-Turonski, P., Net, L. A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R. A., Seder, E., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., and Zhao, Z. W.

Abstract

We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment used the 6 GeV electron beam from the CEBAF accelerator at Jefferson Lab incident on a pressurized $^4$He gaseous target placed in front of the CEBAF Large Acceptance Spectrometer (CLAS). The scattered electron was detected by CLAS and the photon by a dedicated electromagnetic calorimeter at forward angles. To ensure the exclusivity of the process, a specially designed radial time projection chamber was used to detect the recoiling $^4$He nuclei. We measured beam-spin asymmetries larger than those observed on the free proton in the same kinematic domain. From these, we were able to extract, in a model-independent way, the real and imaginary parts of the only $^4$He Compton form factor, $\cal H_A$. This first measurement of coherent deeply virtual Compton scattering on the $^4$He nucleus, with a fully exclusive final state via nuclear recoil tagging, leads the way toward 3D imaging of the partonic structure of nuclei.

Published
2017
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5. A Radial Time Projection Chamber for $\alpha$ detection in CLAS at JLab

Author

Dupré, R., Stepanyan, S., Hattawy, M., Baltzell, N., Hafidi, K., Battaglieri, M., Bueltmann, S., Celentano, A., De Vita, R., Alaoui, A. El, Fassi, L. El, Fenker, H., Kosheleva, K., Kuhn, S., Musico, P., Minutoli, S., Oliver, M., Perrin, Y., Torayev, B., Voutier, E., Dupré, R., Stepanyan, S., Hattawy, M., Baltzell, N., Hafidi, K., Battaglieri, M., Bueltmann, S., Celentano, A., De Vita, R., Alaoui, A. El, Fassi, L. El, Fenker, H., Kosheleva, K., Kuhn, S., Musico, P., Minutoli, S., Oliver, M., Perrin, Y., Torayev, B., and Voutier, E.

Abstract

A new Radial Time Projection Chamber (RTPC) was developed at the Jefferson Laboratory to track low-energy nuclear recoils for the purpose of measuring exclusive nuclear reactions, such as coherent Deeply Virtual Compton Scattering and coherent meson production off $^4$He. In such processes, the $^4$He nucleus remains intact in the final state, however the CEBAF Large Acceptance Spectrometer (CLAS) cannot track the low energy $\alpha$ particles. In 2009, we carried out measurements using the CLAS spectrometer supplemented by the RTPC positioned directly around a gaseous $^4$He target, allowing a detection threshold as low as 12$\sim$MeV for $^4$He. This article discusses the design, principle of operation, calibration methods and the performances of this RTPC.

Published
2017
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6. Measurement of Single and Double Spin Asymmetries in Deep Inelastic Pion Electroproduction with a Longitudinally Polarized Target

Author

The CLAS Collaboration, Avakian, H., Bosted, P., Burkert, V. D., Elouadrhiri, L., Adhikari, K. P., Aghasyan, M., Amaryan, M., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Branford, D., Briscoe, W. J., Brooks, W., Carman, D. S., Casey, L., Cole, P. L., Collins, P., Crabb, D., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., DeVita, R., DeSanctis, E., Deur, A., Dey, B., Dhamija, S., Dickson, R., Djalali, C., Dodge, G., Doughty, D., Dupre, R., ElAlaoui, A., Eugenio, P., Fegan, S., Fersch, R., Forest, T. A., Fradi, A., Gabrielyan, M. Y., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hassall, N., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jawalkar, S. S., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, W., Klein, A., Klein, F. J., Konczykowski, P., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kuznetsov, V., Livingston, K., Lu, H. Y., Markov, N., Mayer, M., McAndrew, J., McCracken, M. E., McKinnon, B., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niroula, M. R., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Perrin, Y., Pisano, S., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B. A., Ricco, G., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M. S., Salamanca, J., Salgado, C., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Stoler, P., Strauch, S., Suleiman, R., Taiuti, M., Tedeschi, D. J., Tkachenko, S., Ungaro, M., Vernarsky, B ., Vineyard, M. F., Voutier, E., Watts, D. P., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zhang, J., Zhao, B., Zhao, Z. W., The CLAS Collaboration, Avakian, H., Bosted, P., Burkert, V. D., Elouadrhiri, L., Adhikari, K. P., Aghasyan, M., Amaryan, M., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Branford, D., Briscoe, W. J., Brooks, W., Carman, D. S., Casey, L., Cole, P. L., Collins, P., Crabb, D., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., DeVita, R., DeSanctis, E., Deur, A., Dey, B., Dhamija, S., Dickson, R., Djalali, C., Dodge, G., Doughty, D., Dupre, R., ElAlaoui, A., Eugenio, P., Fegan, S., Fersch, R., Forest, T. A., Fradi, A., Gabrielyan, M. Y., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hassall, N., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jawalkar, S. S., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, W., Klein, A., Klein, F. J., Konczykowski, P., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kuznetsov, V., Livingston, K., Lu, H. Y., Markov, N., Mayer, M., McAndrew, J., McCracken, M. E., McKinnon, B., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niroula, M. R., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Perrin, Y., Pisano, S., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B. A., Ricco, G., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M. S., Salamanca, J., Salgado, C., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Stoler, P., Strauch, S., Suleiman, R., Taiuti, M., Tedeschi, D. J., Tkachenko, S., Ungaro, M., Vernarsky, B ., Vineyard, M. F., Voutier, E., Watts, D. P., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zhang, J., Zhao, B., and Zhao, Z. W.

Abstract

We report the first measurement of the transverse momentum dependence of double spin asymmetries in semi-inclusive production of pions in deep inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Thomas Jefferson National Accelerator Facility (JLab). A significant non-zero $\sin2\phi$ single spin asymmetry was also observed for the first time indicating strong spin-orbit correlations for transversely polarized quarks in the longitudinally polarized proton. The azimuthal modulations of single spin asymmetries have been measured over a wide kinematic range.

Published
2010
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7. Measurement of Single and Double Spin Asymmetries in Deep Inelastic Pion Electroproduction with a Longitudinally Polarized Target

Author

The CLAS Collaboration, Avakian, H., Bosted, P., Burkert, V. D., Elouadrhiri, L., Adhikari, K. P., Aghasyan, M., Amaryan, M., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Branford, D., Briscoe, W. J., Brooks, W., Carman, D. S., Casey, L., Cole, P. L., Collins, P., Crabb, D., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., DeVita, R., DeSanctis, E., Deur, A., Dey, B., Dhamija, S., Dickson, R., Djalali, C., Dodge, G., Doughty, D., Dupre, R., ElAlaoui, A., Eugenio, P., Fegan, S., Fersch, R., Forest, T. A., Fradi, A., Gabrielyan, M. Y., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hassall, N., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jawalkar, S. S., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, W., Klein, A., Klein, F. J., Konczykowski, P., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kuznetsov, V., Livingston, K., Lu, H. Y., Markov, N., Mayer, M., McAndrew, J., McCracken, M. E., McKinnon, B., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niroula, M. R., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Perrin, Y., Pisano, S., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B. A., Ricco, G., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M. S., Salamanca, J., Salgado, C., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Stoler, P., Strauch, S., Suleiman, R., Taiuti, M., Tedeschi, D. J., Tkachenko, S., Ungaro, M., Vernarsky, B ., Vineyard, M. F., Voutier, E., Watts, D. P., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zhang, J., Zhao, B., Zhao, Z. W., The CLAS Collaboration, Avakian, H., Bosted, P., Burkert, V. D., Elouadrhiri, L., Adhikari, K. P., Aghasyan, M., Amaryan, M., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Branford, D., Briscoe, W. J., Brooks, W., Carman, D. S., Casey, L., Cole, P. L., Collins, P., Crabb, D., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., DeVita, R., DeSanctis, E., Deur, A., Dey, B., Dhamija, S., Dickson, R., Djalali, C., Dodge, G., Doughty, D., Dupre, R., ElAlaoui, A., Eugenio, P., Fegan, S., Fersch, R., Forest, T. A., Fradi, A., Gabrielyan, M. Y., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hassall, N., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jawalkar, S. S., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, W., Klein, A., Klein, F. J., Konczykowski, P., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kuznetsov, V., Livingston, K., Lu, H. Y., Markov, N., Mayer, M., McAndrew, J., McCracken, M. E., McKinnon, B., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niroula, M. R., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Perrin, Y., Pisano, S., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B. A., Ricco, G., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M. S., Salamanca, J., Salgado, C., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Stoler, P., Strauch, S., Suleiman, R., Taiuti, M., Tedeschi, D. J., Tkachenko, S., Ungaro, M., Vernarsky, B ., Vineyard, M. F., Voutier, E., Watts, D. P., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zhang, J., Zhao, B., and Zhao, Z. W.

Abstract

We report the first measurement of the transverse momentum dependence of double spin asymmetries in semi-inclusive production of pions in deep inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Thomas Jefferson National Accelerator Facility (JLab). A significant non-zero $\sin2\phi$ single spin asymmetry was also observed for the first time indicating strong spin-orbit correlations for transversely polarized quarks in the longitudinally polarized proton. The azimuthal modulations of single spin asymmetries have been measured over a wide kinematic range.

Published
2010
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10. Rajeunissement de clones matures d'Hevea brasiliensis (Muell. Arg.) par microgreffage in vitro

Author

Perrin, Y., Lardet, Ludovic, Enjalric, Frank, Carron, Marc-Philippe, Perrin, Y., Lardet, Ludovic, Enjalric, Frank, and Carron, Marc-Philippe

Abstract

L'application à deux clones matures d'Hevea brasiliensis (Mull. Arg.), IRCA 18 et PB235, de la technique de microgreffage d'apex sur des plantules âgées de trois semaines germées in vitro permet le microbouturage de ces clones. Lorsqu'il est effectué à partir d'explants nodaux ou d'extrémités de pousses prélevées sur les greffons développés in vitro sur les porte-greffes, le microbouturage du matériel clonal microgreffé n'est pas possible. De tels explants sont en effet inaptes à reprendre une activité caulogène après leur isolement. Ce problème est surmonté par l'utilisation d'explants mixtes, constitués d'une partie du porte-greffe en contact avec le milieu de culture et du greffon clonal à partir duquel se développent régulièrement des pousses axillaires tout au long des cycles de culture. Les aptitudes au bourgeonnement et au développement de pousses au cours des cycles de culture ont été comparés entre les explants mixtes issus de microgreffes, les explants nodaux d'individus juvéniles et les explants nodaux des clones matures non traités. Cette comparaison révèle un effet très positif de l'application du microgreffage sur l'aptitude des clones IRCA 18 et PB 235 à la caulogenèse in vitro. En outre, les pousses produites par les explants clonaux issus des microgreffes ont une aptitude à l'enracinement identique à celles des pousses produites par les explants issus d'individus juvéniles [résumé d'auteur]

Published
1994

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