First Exclusive Measurement of Deeply Virtual Compton Scattering off $^4$He: Toward the 3D Tomography of Nuclei
- Hattawy, M.
- Baltzell, N.A.
- Dupré, R.
- Hafidi, K.
- Stepanyan, S.
- Bültmann, S.
- de Vita, R.
- El Alaoui, A.
- El Fassi, L.
- 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.
- Anefalos Pereira, S.
- 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
- Munoz Camacho, C.
- 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.
DOIAbstract
International audienceWe 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 uses the 6 GeV electron beam from the Continuous Electron Beam Accelerator Facility (CEBAF) accelerator at Jefferson Lab incident on a pressurized He4 gaseous target placed in front of the CEBAF Large Acceptance Spectrometer (CLAS). The scattered electron is 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 is used to detect the recoiling He4 nuclei. We measure beam-spin asymmetries larger than those observed on the free pr...
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