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First CLAS12 measurement of DVCS beam-spin asymmetries in the extended valence region

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arxiv 2211.11274 v2 pith:LNDOCJKN submitted 2022-11-21 hep-ex

First CLAS12 measurement of DVCS beam-spin asymmetries in the extended valence region

CLAS Collaboration: G. Christiaens , M. Defurne , D. Sokhan , P. Achenbach , Z. Akbar , M.J. Amaryan , H. Atac , H. Avakian
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C. Ayerbe Gayoso L. Baashen N.A. Baltzell L. Barion M. Bashkanov M. Battaglieri I. Bedlinskiy B. Benkel F. Benmokhtar A. Bianconi A.S. Biselli M. Bondi W.A. Booth F. Boss\`u S. Boiarinov K.-Th. Brinkmann W.J. Briscoe S. Bueltmann D. Bulumulla V.D. Burkert T. Cao D.S. Carman J.C. Carvajal A. Celentano P. Chatagnon V. Chesnokov T. Chetry G. Ciullo G. Clash P.L. Cole M. Contalbrigo G. Costantini A. D'Angelo N. Dashyan R. De Vita A. Deur S. Diehl C. Dilks C. Djalali R. Dupre H. Egiyan M. Ehrhart A. El Alaoui L. El Fassi L. Elouadrhiri S. Fegan A. Filippi K. Gates G. Gavalian Y. Ghandilyan G.P. Gilfoyle F.X. Girod D.I. Glazier A.A. Golubenko G. Gosta R.W. Gothe Y. Gotra K.A. Griffioen M. Guidal K. Hafidi H. Hakobyan M. Hattawy F. Hauenstein T.B. Hayward D. Heddle A. Hobart D.E. Holmberg M. Holtrop Y. Ilieva D.G. Ireland E.L. Isupov H.S. Jo M.L. Kabir D. Keller M. Khachatryan A. Khanal W. Kim A. Kripko V. Kubarovsky S.E. Kuhn V. Lagerquist L. Lanza M. Leali S. Lee P. Lenisa X. Li K. Livingston I .J .D. MacGregor D. Marchand V. Mascagna G. Matousek B. McKinnon C. McLauchlin Z.E. Meziani S. Migliorati R.G. Milner T. Mineeva M. Mirazita V. Mokeev E. Molina C. Munoz Camacho P. Nadel-Turonski P. Naidoo K. Neupane S. Niccolai M. Nicol G. Niculescu M. Osipenko M. Ouillon P. Pandey M. Paolone L.L. Pappalardo R. Paremuzyan E. Pasyuk S.J. Paul W. Phelps N. Pilleux M. Pokhrel J. Poudel J.W. Price Y. Prok A. Radic N. Ramasubramanian B.A. Raue T. Reed J. Richards M. Ripani J. Ritman P. Rossi F. Sabati\'e C. Salgado S. Schadmand A. Schmidt M.B.C. Scott Y.G. Sharabian E.V. Shirokov U. Shrestha P. Simmerling N. Sparveris M. Spreafico S. Stepanyan I.I. Strakovsky S. Strauch J.A. Tan N. Trotta M. Turisini R. Tyson M. Ungaro S. Vallarino L. Venturelli H. Voskanyan E. Voutier D.P. Watts X. Wei R. Williams R. Wishart M.H. Wood N. Zachariou J. Zhang Z.W. Zhao V. Ziegler M. Zurek
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keywords dvcsbeam-spinclas12datafirstmeasurementregionscattering
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Deeply virtual Compton scattering (DVCS) allows one to probe Generalized Parton Distributions (GPDs) describing the 3D structure of the nucleon. We report the first measurement of the DVCS beam-spin asymmetry using the CLAS12 spectrometer with a 10.2 and 10.6 GeV electron beam scattering from unpolarised protons. The results greatly extend the $Q^2$ and Bjorken-$x$ phase space beyond the existing data in the valence region and provide over 2000 new data points measured with unprecedented statistical uncertainty, setting new, tight constraints for future phenomenological studies.

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