• DOI:10.1103/PhysRevLett.119.202004
• Corpus ID: 3531110

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

@article{Hattawy2017FirstEM,
  title={First Exclusive Measurement of Deeply Virtual Compton Scattering off ^\{4\}He: Toward the 3D Tomography of Nuclei.},
  author={Mohammad Hattawy and Nathan Adam Baltzell and Rapha{\"e}l Dupr{\'e} and Kawtar Hafidi and Stepan Stepanyan and Stephen B{\"u}ltmann and Raffaella De Vita and A. El Alaoui and Lamiaa El Fassi and Hovanes Egiyan and F. Girod and Michel Guidal and David G. Jenkins and Simonetta Liuti and Yohann Perrin and Bayram Torayev and Eric Voutier and K. Adhikari and Shankar Adhikari and Dasuni Adikaram and Zulkaida Akbar and Moskov J. Amaryan and S. Anefalos Pereira and Whitney Armstrong and Harut Avakian and J. Ball and M. Bashkanov and M. Battaglieri and V. Batourine and I. Bedlinskiy and Angela Biselli and S. Boiarinov and William J. Briscoe and William K. Brooks and Volker D. Burkert and Frank Thanh Cao and D. S. Carman and Andrea Celentano and Gabriel Charles and Taya Chetry and Guiseppe Ciullo and L. Clark and Luca Colaneri and Philip Lawrence Cole and Marco Contalbrigo and Olga Cortes and Volker Crede and A. D’angelo and Natalya Dashyan and E. De Sanctis and Alexandre Deur and Chaden Djalali and Latifa Elouadrhiri and Paul Michael Eugenio and G. Fedotov and Stuart Fegan and R. G. Fersch and A. Filippi and J. A. Fleming and Tony Andrew Forest and Ahmed Fradi and Michel Garçon and Nerses Gevorgyan and Y. S. Ghandilyan and Gerard P. Gilfoyle and Kevin Giovanetti and Colin Gleason and Wesley Gohn and E. N. Golovatch and Ralf W. Gothe and Keith A. Griffioen and L . B. Guo and Hrachya Hakobyan and Charles Hanretty and Nathan Harrison and David Heddle and Kenneth H. Hicks and Maurik Willem Holtrop and S. M. Hughes and David Ireland and B. S. Ishkhanov and E. Isupov and H. Jiang and Kyungseon Joo and Sylvester Joosten and Dustin Keller and George Khachatryan and Mariana Khachatryan and Mahbub Khandaker and A. Kim and W. Kim and Andi Klein and F. Klein and Valery Kubarovsky and Sebastian E. Kuhn and Sergey Kuleshov and L. Lanza and P. Lenisa and Kenneth Livingston and H. Y. Lu and Ian J. D. MacGregor and Nikolai Markov and Michael Mayer and M. E. Mccracken and B. Mckinnon and Christopher Meyer and Zein-Eddine Meziani and Taisiya Mineeva and Marco Mirazita and Victor I. Mokeev and Rachel Montgomery and Herv{\'e} Moutarde and Aram Movsisyan and C. Mu{\~n}oz Camacho and Pawel Nadel-Turonski and Lelia Net and Silvia Niccolai and Gabriel Niculescu and Ioana Niculescu and Mikhail Osipenko and Alexander Ostrovidov and M Paolone and Rafayel Paremuzyan and K. Park and Eugene Pasyuk and Evan Phelps and William Phelps and Silvia Pisano and O. I. Pogorelko and Joseph Price and Yelena Prok and Dan Protopopescu and Marco Ripani and Barry Ritchie and Alessandro Rizzo and Guenther Rosner and Patrizia Rossi and Franck Sabati{\'e} and Claudio Guedes Salgado and Reinhard A Schumacher and Erin Seder and Yu. Sharabian and Ani Simonyan and Iu. A. Skorodumina and G. D. Smith and Daria Sokhan and N. Sparveris and Steffen Strauch and Mauro Gino Taiuti and Maurizio Ungaro and H. Voskanyan and Natalie Kathleen Walford and D P Watts and X. Wei and Lawrence B. Weinstein and Martin Wood and Nicholas Zachariou and Lorenzo Zana and J. Zhang and Z. W. Zhao},
  journal={Physical review letters},
  year={2017},
  volume={119 20},
  pages={
          202004
        }
}

• M. Hattawy, N. Baltzell, +157 authors Z. Zhao
• Published 11 July 2017
• Physics
• Physical review letters

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 uses the 6 GeV electron beam from the Continuous Electron Beam Accelerator Facility (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 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 ^{4}He nuclei. We measure beam-spin asymmetries larger than those observed on the free proton in the same kinematic domain. From these, we are able to extract, in a model-independent way, the real and imaginary parts of the only ^{4}He Compton form factor, 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.