Measurement of Unpolarized and Polarized Cross Sections for Deeply Virtual Compton Scattering on the Proton at Jefferson Laboratory with CLAS

N. Hirlinger Saylor (1) , B. Guegan (1) , V.D. Burkert , L. Elouadrhiri , M. Garçon (2) , F.X. Girod (2) , M. Guidal (1) , H.S. Jo (1) , V. Kubarovsky , S. Niccolai (1) , P. Stoler , K.P. Adhikari , S. Adhikari , Z. Akbar , M.J. Amaryan , S. Anefalos Pereira , J. Ball (2) , I. Balossino , N.A. Baltzell , L. Barion , M. Battaglieri , V. Batourine , I. Bedlinskiy , A.S. Biselli , S. Boiarinov , W.J. Briscoe , W.K. Brooks , S. Bültmann , F. Cao , D.S. Carman , A. Celentano , G. Charles , T. Chetry , G. Ciullo , Brandon A. Clary , P.L. Cole , M. Contalbrigo , O. Cortes , A. d'Angelo , N. Dashyan , R. de Vita , M. Defurne (2) , A. Deur , S. Diehl , C. Djalali , R. Dupre (1) , H. Egiyan , A. El Alaoui , L. El Fassi , P. Eugenio , G. Fedotov , R. Fersch , A. Filippi , T.A. Forest , A. Fradi (1) , G. Gavalian , N. Gevorgyan , Y. Ghandilyan , G.P. Gilfoyle , K.L. Giovanetti , C. Gleason , W. Gohn , E. Golovatch , R.W. Gothe , K.A. Griffioen , L. Guo , K. Hafidi , H. Hakobyan , C. Hanretty , N. Harrison , M. Hattawy , D. Heddle , K. Hicks , M. Holtrop , Y. Ilieva , D.G. Ireland , B.S. Ishkhanov , E.L. Isupov , D. Jenkins , S. Johnston , K. Joo , S. Joosten , M.L. Kabir , D. Keller , G. Khachatryan , M. Khachatryan , M. Khandaker , A. Kim , W. Kim , A. Klein , F.J. Klein , S.E. Kuhn , S.V. Kuleshov , L. Lanza , P. Lenisa , K. Livingston , H.Y. Lu , I.J.D. Macgregor , N. Markov , M.E. Mccracken , B. Mckinnon , C.A. Meyer , Z.E. Meziani , T. Mineeva , M. Mirazita , V. Mokeev , R.A. Montgomery , A. Movsisyan , C. Munoz Camacho (1) , P. Nadel-Turonski , G. Niculescu , M. Osipenko , A.I. Ostrovidov , M. Paolone , R. Paremuzyan , K. Park , E. Pasyuk , W. Phelps , O. Pogorelko , J.W. Price , S. Procureur (2) , Y. Prok , D. Protopopescu , M. Ripani , D. Riser , A. Rizzo , G. Rosner , P. Rossi , F. Sabatié (2) , C. Salgado , R.A. Schumacher , Y.G. Sharabian , Iu. Skorodumina , G.D. Smith , N. Sparveris , S. Stepanyan , S. Strauch , M. Taiuti , J.A. Tan , M. Ungaro , H. Voskanyan , E. Voutier (1) , D.P. Watts , X. Wei , M.H. Wood , N. Zachariou , J. Zhang , Z.W. Zhao

1 IPNO - Institut de Physique Nucléaire d'Orsay
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

This paper reports the measurement of polarized and unpolarized cross sections for the ep -> e'p' reaction, which is comprised of Deeply Virtual Compton Scattering (DVCS) and Bethe-Heitler (BH) processes, at an electron beam energy of 5.88 GeV at the Thomas Jefferson National Accelerator Facility using the Large Acceptance Spectrometer CLAS. The unpolarized cross sections and polarized cross section differences have been measured over broad kinematics, 0.10 < x_B < 0.58, 1.0 < Q^2 < 4.8 GeV^2, and 0.09 < -t < 2.00 GeV^2. The results are found to be consistent with previous CLAS data, and these new data are discussed in the framework of the generalized parton distribution approach. Calculations with two widely used phenomenological models, denoted VGG and KMSC, are approximately compatible with the experimental results over a large portion of the kinematic range of the data.

Mots clés: Hadronic Physics and QCD; electron p: deep inelastic scattering; photon: electroproduction; cross section: difference; spectrometer: acceptance; electron: polarized beam; beam: energy; parton: distribution function; deeply virtual Compton scattering; momentum transfer dependence; x-dependence; magnetic spectrometer; CLAS; Newport News CEBAF Linac; kinematics; generalized parton distribution; channel cross section: measured; experimental results; interference: Bethe-Heitler; accelerator

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique des Hautes Energies - Phénoménologie [hep-ph]; Physique Nucléaire Expérimentale [nucl-ex]

N. Hirlinger Saylor, B. Guegan, V.D. Burkert, L. Elouadrhiri, M. Garçon, et al.. Measurement of Unpolarized and Polarized Cross Sections for Deeply Virtual Compton Scattering on the Proton at Jefferson Laboratory with CLAS. Phys.Rev.C, 2018, 98 (4), pp.045203. ⟨10.1103/PhysRevC.98.045203⟩. ⟨hal-01902921⟩