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arXiv · 1707.03361

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

M. Hattawy·N. A. Baltzell·R. Dupré·K. Hafidi·S. Stepanyan·S. Bültmann·R. De Vita·A. El Alaoui·L. El Fassi·H. Egiyan·F. X. Girod·M. Guidal·D. Jenkins·S. Liuti·Y. Perrin·B. Torayev·E. Voutier·K. P. Adhikari·S. Adhikari·D. Adikaram·Z. Akbar·M. J. Amaryan·S. Anefalos Pereira·Whitney R. Armstrong·H. Avakian·J. Ball·M. Bashkanov·M. Battaglieri·V. Batourine·I. Bedlinskiy·A. S. Biselli·S. Boiarinov·W. J. Briscoe·W. K. Brooks·V. D. Burkert·Frank Thanh Cao·D. S. Carman·A. Celentano·G. Charles·T. Chetry·G. Ciullo·L. Clark·L. Colaneri·P. L. Cole·M. Contalbrigo·O. Cortes·V. Crede·A. D'Angelo·N. Dashyan·E. De Sanctis·A. Deur·C. Djalali·L. Elouadrhiri·P. Eugenio·G. Fedotov·S. Fegan·R. Fersch·A. Filippi·J. A. Fleming·T. A. Forest·A. Fradi·M. Garçon·N. Gevorgyan·Y. Ghandilyan·G. P. Gilfoyle·K. L. Giovanetti·C. Gleason·W. Gohn·E. Golovatch·R. W. Gothe·K. A. Griffioen·L. Guo·H. Hakobyan·C. Hanretty·N. Harrison·D. Heddle·K. Hicks·M. Holtrop·S. M. Hughes·D. G. Ireland·B. S. Ishkhanov·E. L. Isupov·H. Jiang·K. Joo·S. Joosten·D. Keller·G. Khachatryan·M. Khachatryan·M. Khandaker·A. Kim·W. Kim·A. Klein·F. J. Klein·V. Kubarovsky·S. E. Kuhn·S. V. Kuleshov·L. Lanza·P. Lenisa·K. Livingston·H. Y. Lu
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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.

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M. Hattawy, N. A. Baltzell, R. Dupré, K. Hafidi, S. Stepanyan, S. Bültmann, R. De Vita, A. El Alaoui, L. El Fassi, H. Egiyan, F. X. Girod, M. Guidal, D. Jenkins, S. Liuti, Y. Perrin, B. Torayev, E. Voutier, K. P. Adhikari, S. Adhikari, D. Adikaram, Z. Akbar, M. J. Amaryan, S. Anefalos Pereira, Whitney R. Armstrong, H. Avakian, J. Ball, M. Bashkanov, M. Battaglieri, V. Batourine, I. Bedlinskiy, A. S. Biselli, S. Boiarinov, W. J. Briscoe, W. K. Brooks, V. D. Burkert, Frank Thanh Cao, D. S. Carman, A. Celentano, G. Charles, T. Chetry, G. Ciullo, L. Clark, L. Colaneri, P. L. Cole, M. Contalbrigo, O. Cortes, V. Crede, A. D'Angelo, N. Dashyan, E. De Sanctis, A. Deur, C. Djalali, L. Elouadrhiri, P. Eugenio, G. Fedotov, S. Fegan, R. Fersch, A. Filippi, J. A. Fleming, T. A. Forest, A. Fradi, M. Garçon, N. Gevorgyan, Y. Ghandilyan, G. P. Gilfoyle, K. L. Giovanetti, C. Gleason, W. Gohn, E. Golovatch, R. W. Gothe, K. A. Griffioen, L. Guo, H. Hakobyan, C. Hanretty, N. Harrison, D. Heddle, K. Hicks, M. Holtrop, S. M. Hughes, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, H. Jiang, K. Joo, S. Joosten, D. Keller, G. Khachatryan, M. Khachatryan, M. Khandaker, A. Kim, W. Kim, A. Klein, F. J. Klein, V. Kubarovsky, S. E. Kuhn, S. V. Kuleshov, L. Lanza, P. Lenisa, K. Livingston, H. Y. Lu. 2017-07-11. First Exclusive Measurement of Deeply Virtual Compton Scattering off $^4$He: Toward the 3D Tomography of Nuclei. https://doi.org/10.1103/physrevlett.119.202004

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