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

CLAS Collaboration

doi:10.1103/PhysRevLett.119.202004

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

CLAS Collaboration

Research output: Contribution to journal › Article

12 Scopus citations

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 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 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 He4 Compton form factor, HA. This first measurement of coherent deeply virtual Compton scattering on the He4 nucleus, with a fully exclusive final state via nuclear recoil tagging, leads the way toward 3D imaging of the partonic structure of nuclei.

Original language	English (US)
Article number	202004
Journal	Physical Review Letters
Volume	119
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.119.202004
State	Published - Nov 15 2017

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.119.202004

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CLAS Collaboration (2017). First Exclusive Measurement of Deeply Virtual Compton Scattering off He 4: Toward the 3D Tomography of Nuclei. Physical Review Letters, 119(20), [202004]. https://doi.org/10.1103/PhysRevLett.119.202004

@article{2eac2207f66d4479a7da47426aaeb337,

title = "First Exclusive Measurement of Deeply Virtual Compton Scattering off He 4: Toward the 3D Tomography of Nuclei",

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 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 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 He4 Compton form factor, HA. This first measurement of coherent deeply virtual Compton scattering on the He4 nucleus, with a fully exclusive final state via nuclear recoil tagging, leads the way toward 3D imaging of the partonic structure of nuclei.",

author = "{CLAS Collaboration} and M. Hattawy and Baltzell, {N. A.} and R. Dupr{\'e} and K. Hafidi and S. Stepanyan and S. B{\"u}ltmann and {De Vita}, R. and {El Alaoui}, A. and {El Fassi}, L. and H. Egiyan and Girod, {F. X.} and M. Guidal and D. Jenkins and S. Liuti and Y. Perrin and B. Torayev and E. Voutier and Adhikari, {K. P.} and S. Adhikari and D. Adikaram and Z. Akbar and Amaryan, {M. J.} and {Anefalos Pereira}, S. and Armstrong, {Whitney R.} and H. Avakian and J. Ball and M. Bashkanov and M. Battaglieri and V. Batourine and I. Bedlinskiy and Biselli, {A. S.} and S. Boiarinov and Briscoe, {W. J.} and Brooks, {W. K.} and Burkert, {V. D.} and {Thanh Cao}, Frank and Carman, {D. S.} and A. Celentano and G. Charles and T. Chetry and G. Ciullo and L. Clark and L. Colaneri and Cole, {P. L.} and M. Contalbrigo and O. Cortes and V. Crede and A. D'Angelo and N. Dashyan and Barry Ritchie",

year = "2017",

month = nov,

day = "15",

doi = "10.1103/PhysRevLett.119.202004",

language = "English (US)",

volume = "119",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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T1 - First Exclusive Measurement of Deeply Virtual Compton Scattering off He 4

T2 - Toward the 3D Tomography of Nuclei

AU - CLAS Collaboration

AU - Hattawy, M.

AU - Baltzell, N. A.

AU - Dupré, R.

AU - Hafidi, K.

AU - Stepanyan, S.

AU - Bültmann, S.

AU - De Vita, R.

AU - El Alaoui, A.

AU - El Fassi, L.

AU - Egiyan, H.

AU - Girod, F. X.

AU - Guidal, M.

AU - Jenkins, D.

AU - Liuti, S.

AU - Perrin, Y.

AU - Torayev, B.

AU - Voutier, E.

AU - Adhikari, K. P.

AU - Adhikari, S.

AU - Adikaram, D.

AU - Akbar, Z.

AU - Amaryan, M. J.

AU - Anefalos Pereira, S.

AU - Armstrong, Whitney R.

AU - Avakian, H.

AU - Ball, J.

AU - Bashkanov, M.

AU - Battaglieri, M.

AU - Batourine, V.

AU - Bedlinskiy, I.

AU - Biselli, A. S.

AU - Boiarinov, S.

AU - Briscoe, W. J.

AU - Brooks, W. K.

AU - Burkert, V. D.

AU - Thanh Cao, Frank

AU - Carman, D. S.

AU - Celentano, A.

AU - Charles, G.

AU - Chetry, T.

AU - Ciullo, G.

AU - Clark, L.

AU - Colaneri, L.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Cortes, O.

AU - Crede, V.

AU - D'Angelo, A.

AU - Dashyan, N.

AU - Ritchie, Barry

PY - 2017/11/15

Y1 - 2017/11/15

N2 - 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 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 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 He4 Compton form factor, HA. This first measurement of coherent deeply virtual Compton scattering on the He4 nucleus, with a fully exclusive final state via nuclear recoil tagging, leads the way toward 3D imaging of the partonic structure of nuclei.

AB - 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 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 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 He4 Compton form factor, HA. This first measurement of coherent deeply virtual Compton scattering on the He4 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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U2 - 10.1103/PhysRevLett.119.202004

DO - 10.1103/PhysRevLett.119.202004

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JF - Physical Review Letters

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