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

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arxiv 1707.03361 v1 pith:SD53BEFG submitted 2017-07-11 nucl-ex hep-ex

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

M. Hattawy , N.A. Baltzell , R. Dupr\'e , K. Hafidi , S. Stepanyan , S. B\"ultmann , R. De Vita , A. El Alaoui
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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. Gar\c{c}on 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 I .J .D. MacGregor N. Markov M. Mayer M.E. McCracken B. McKinnon C.A. Meyer Z.E. Meziani T. Mineeva M. Mirazita V. Mokeev R.A. Montgomery H. Moutarde A Movsisyan C. Munoz Camacho P. Nadel-Turonski L.A. Net S. Niccolai G. Niculescu I. Niculescu M. Osipenko A.I. Ostrovidov M. Paolone R. Paremuzyan K. Park E. Pasyuk E. Phelps W. Phelps S. Pisano O. Pogorelko J.W. Price Y. Prok D. Protopopescu M. Ripani B.G. Ritchie A. Rizzo G. Rosner P. Rossi F. Sabati\'e C. Salgado R.A. Schumacher E. Seder Y.G. Sharabian A. Simonyan Iu. Skorodumina G.D. Smith D. Sokhan N. Sparveris S. Strauch M. Taiuti M. Ungaro H. Voskanyan N.K. Walford D.P. Watts X. Wei L.B. Weinstein M.H. Wood N. Zachariou L. Zana J. Zhang Z.W. Zhao
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classification nucl-ex hep-ex
keywords comptondeeplyexclusivefirstmeasurementnucleiscatteringvirtual
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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Cited by 3 Pith papers

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  1. Quark and gluon tomography of the helium-4 nucleus

    hep-ph 2026-05 unverdicted novelty 8.0

    Using NLO QCD calculations with twist corrections and evolution, the work delivers the first quark-gluon tomography of helium-4 via hard exclusive processes.

  2. Coherent deeply virtual Compton scattering on helium-4 beyond leading power

    hep-ph 2026-04 unverdicted novelty 6.0

    Computes kinematic twist-3, twist-4 and NLO alpha_s corrections to coherent DVCS on He-4 and extracts the first 3D quark-gluon tomography of the nucleus.

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    hep-ph 2026-04 unverdicted novelty 5.0

    Higher-twist and NLO corrections to DVCS on He-4 enable the first 3D parton-level tomography of the helium-4 nucleus.