Deeply Virtual Compton Scattering Cross Section at High Bjorken xB

Frédéric Georges ,N Compton ,M Nycz ,K Hamilton ,G Hamad ,R Trotta ,B J Crowe ,R Ent ,J Zhang ,Kai Jin ,T Gautam ,S Sooriyaarachchilage ,D Gaskell ,J Bane ,H Atac ,E.r Cohen ,A Sun ,L Ye ,S Širca ,S J Nazeer ,S Barcus ,N Israel ,T Su ,C Chen ,Y X Zhao ,B Duran ,K Aniol ,T Horn ,J-P Chen ,C Peng ,M Carmignotto ,B A Clary ,A Liyanage ,D Hamilton ,C Fanelli ,A Kabir ,Z Ye ,Barak Schmookler ,S A Wood ,F Hauenstein ,K Allada ,D Androić ,Paul M King ,B Karki ,C Muñoz Camacho ,W Henry ,M Mazouz ,D Meekins ,Joseph A Castellano ,Elizabeth Mcclellan ,A Mkrtchyan ,S Allison ,C Palatchi ,P-J Lin ,O F Obretch ,R A Montgomery ,H Ibrahim ,Sakib Rahman ,K Mesik ,N Nuruzzaman ,K Gnanvo ,B Quinn ,F Tortorici ,J R M Annand ,B Pandey ,J Mammei ,E J Brash ,Ye Tian ,S Alsalmi ,S Ali ,X Bai ,H.-S Ko ,J A Magee ,D Higinbotham ,P Nadel-Turoński ,M Dlamini ,T W Danley ,L A Thorne ,H Liu ,C Gal ,V M Gray ,B Sawatzky ,L S Myers ,W.b Li ,Li Ou ,P Reimer ,T Chetry ,M Shabestari ,T Holmstrom ,C Desnault ,W Deconinck ,D Adikaram ,Xiao-Bo Yan ,M Jones ,J Campbell ,V Nelyubin ,B Wojtsekhowski ,N Sparveris ,S Park ,A J R Puckett ,J Liu ,Yanping Huang ,Z Ahmed ,R Michaels ,E Cisbani ,M E Christy ,P Markowitz ,I Sapkota ,J Beričič ,R Pomatsalyuk ,S Covrig Dusa ,M N H Rashad ,V Khachatryan ,N Ton ,A Subedi ,D Di ,E Pooser ,G R Smith ,R Spies ,C M Jen ,F Meddi ,C Yero ,V Punjabi ,R Beminiwattha ,A J Sarty ,H Al-Bataineh ,M Duer ,A Camsonne ,B Aljawrneh ,A Stefanko ,C Ayerbe Gayoso ,V Sulkosky ,S Malace ,C Gu ,A Shahinyan ,N Hirlinger Saylor ,Vincenzo Bellini ,S Li ,G M Urciuoli ,T Averett ,D Nguyen ,O Hansén ,K Park ,G Franklin ,C Hyde ,C Keppel ,D Bulumulla ,J C Cornejo ,G M Huber ,F De Persio ,J Roche ,M Defurne ,O Glamazdin ,D Biswas ,T Hague ,E Fuchey ,K Bartlett ,S Danagoulian ,Y Wang ,E Voutier ,B Waidyawansa ,P Zhu

doi:10.1103/physrevlett.128.252002

Abstract

We report high-precision measurements of the deeply virtual Compton scattering (DVCS) cross section at high values of the Bjorken variable x_{B}. DVCS is sensitive to the generalized parton distributions of the nucleon, which provide a three-dimensional description of its internal constituents. Using the exact analytic expression of the DVCS cross section for all possible polarization states of the initial and final electron and nucleon, and final state photon, we present the first experimental extraction of all four helicity-conserving Compton form factors (CFFs) of the nucleon as a function of x_{B}, while systematically including helicity flip amplitudes. In particular, the high accuracy of the present data demonstrates sensitivity to some very poorly known CFFs.

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