Cross Sections for the Exclusive Photon Electroproduction on the Proton and Generalized Parton Distributions

H S Jo¹, F X Girod^{2

3}, H Avakian², V D Burkert², M Garçon³, M Guidal¹, V Kubarovsky^{2

4}, S Niccolai¹, P Stoler⁴, K P Adhikari⁵, D Adikaram⁵, M J Amaryan⁵, M D Anderson⁶, S Anefalos Pereira⁷, J Ball³, N A Baltzell^{8

9}, M Battaglieri¹⁰, V Batourine^{2

11}, I Bedlinskiy¹², A S Biselli¹³, S Boiarinov², W J Briscoe¹⁴, W K Brooks^{2

15}, D S Carman², A Celentano¹⁰, S Chandavar¹⁶, G Charles¹, L Colaneri^{17

18}, P L Cole¹⁹, N Compton¹⁶, M Contalbrigo²⁰, V Crede²¹, A D'Angelo^{17

18}, N Dashyan²², R De Vita¹⁰, E De Sanctis⁷, A Deur², C Djalali⁹, R Dupre¹, A El Alaoui¹⁵, L El Fassi⁵, L Elouadrhiri², G Fedotov^{23

9}, S Fegan¹⁰, A Filippi²⁴, J A Fleming²⁵, B Garillon¹, N Gevorgyan²², Y Ghandilyan²², G P Gilfoyle²⁶, K L Giovanetti²⁷, J T Goetz¹⁶, E Golovatch²³, R W Gothe⁹, K A Griffioen²⁸, B Guegan¹, N Guler⁵, L Guo^{2

29}, K Hafidi⁸, H Hakobyan^{15

22}, N Harrison³⁰, M Hattawy¹, K Hicks¹⁶, N Hirlinger Saylor⁴, D Ho³¹, M Holtrop³², S M Hughes²⁵, Y Ilieva^{14

9}, D G Ireland⁶, B S Ishkhanov²³, D Jenkins³³, K Joo³⁰, S Joosten³⁴, D Keller³⁵, G Khachatryan²², M Khandaker^{19

36}, A Kim³⁰, W Kim¹¹, A Klein⁵, F J Klein³⁷, S E Kuhn⁵, S V Kuleshov^{12

15}, P Lenisa²⁰, K Livingston⁶, H Y Lu⁹, I J D MacGregor⁶, B McKinnon⁶, Z E Meziani³⁴, M Mirazita⁷, V Mokeev^{2

23}, R A Montgomery⁷, H Moutarde³, A Movsisyan²⁰, E Munevar², C Munoz Camacho¹, P Nadel-Turonski^{2

14}, L A Net⁹, G Niculescu²⁷, M Osipenko¹⁰, A I Ostrovidov²¹, M Paolone³⁴, K Park^{2

11}, E Pasyuk², J J Phillips⁶, S Pisano⁷, O Pogorelko¹², J W Price³⁸, S Procureur³, Y Prok^{2

5}, A J R Puckett³⁰, B A Raue^{2

29}, M Ripani¹⁰, A Rizzo^{17

18}, G Rosner⁶, P Rossi^{2

7}, P Roy²¹, F Sabatié³, C Salgado³⁶, D Schott¹⁴, R A Schumacher³¹, E Seder³⁰, A Simonyan²², Iu Skorodumina^{23

9}, G D Smith²⁵, D Sokhan⁶, N Sparveris³⁴, S Stepanyan², I I Strakovsky¹⁴, S Strauch⁹, V Sytnik¹⁵, Ye Tian⁹, S Tkachenko³⁵, M Ungaro^{2

30}, H Voskanyan²², E Voutier¹, N K Walford³⁷, D P Watts²⁵, X Wei², L B Weinstein⁵, M H Wood^{39

9}, N Zachariou⁹, L Zana^{32

25}, J Zhang^{2

5}, Z W Zhao^{2

5}, I Zonta^{17

18}; CLAS Collaboration

Affiliations

¹ Institut de Physique Nucléaire, CNRS/IN2P3 and Université Paris Sud, Orsay, France.
² Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
³ CEA, Centre de Saclay, Irfu/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France.
⁴ Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA.
⁵ Old Dominion University, Norfolk, Virginia 23529, USA.
⁶ University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁷ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
⁸ Argonne National Laboratory, Argonne, Illinois 60439, USA.
⁹ University of South Carolina, Columbia, South Carolina 29208, USA.
¹⁰ INFN, Sezione di Genova, 16146 Genova, Italy.
¹¹ Kyungpook National University, Daegu 702-701, Republic of Korea.
¹² Institute of Theoretical and Experimental Physics, Moscow 117259, Russia.
¹³ Fairfield University, Fairfield, Connecticut 06824, USA.
¹⁴ The George Washington University, Washington, D.C. 20052, USA.
¹⁵ Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
¹⁶ Ohio University, Athens, Ohio 45701, USA.
¹⁷ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
¹⁸ Università di Roma Tor Vergata, 00133 Rome, Italy.
¹⁹ Idaho State University, Pocatello, Idaho 83209, USA.
²⁰ INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
²¹ Florida State University, Tallahassee, Florida 32306, USA.
²² Yerevan Physics Institute, 375036 Yerevan, Armenia.
²³ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
²⁴ INFN, Sezione di Torino, 10125 Torino, Italy.
²⁵ Edinburgh University, Edinburgh EH9 3JZ, United Kingdom.
²⁶ University of Richmond, Richmond, Virginia 23173, USA.
²⁷ James Madison University, Harrisonburg, Virginia 22807, USA.
²⁸ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
²⁹ Florida International University, Miami, Florida 33199, USA.
³⁰ University of Connecticut, Storrs, Connecticut 06269, USA.
³¹ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
³² University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³³ Virginia Tech, Blacksburg, Virginia 24061-0435, USA.
³⁴ Temple University, Philadelphia, Pennsylvania 19122, USA.
³⁵ University of Virginia, Charlottesville, Virginia 22901, USA.
³⁶ Norfolk State University, Norfolk, Virginia 23504, USA.
³⁷ Catholic University of America, Washington, D.C. 20064, USA.
³⁸ California State University, Dominguez Hills, Carson, California 90747, USA.
³⁹ Canisius College, Buffalo, New York 14208, USA.

PMID: 26636848
DOI: 10.1103/PhysRevLett.115.212003

Cross Sections for the Exclusive Photon Electroproduction on the Proton and Generalized Parton Distributions

H S Jo et al. Phys Rev Lett. 2015.

. 2015 Nov 20;115(21):212003.

doi: 10.1103/PhysRevLett.115.212003. Epub 2015 Nov 17.

Authors

Affiliations

¹ Institut de Physique Nucléaire, CNRS/IN2P3 and Université Paris Sud, Orsay, France.
² Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
³ CEA, Centre de Saclay, Irfu/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France.
⁴ Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA.
⁵ Old Dominion University, Norfolk, Virginia 23529, USA.
⁶ University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁷ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
⁸ Argonne National Laboratory, Argonne, Illinois 60439, USA.
⁹ University of South Carolina, Columbia, South Carolina 29208, USA.
¹⁰ INFN, Sezione di Genova, 16146 Genova, Italy.
¹¹ Kyungpook National University, Daegu 702-701, Republic of Korea.
¹² Institute of Theoretical and Experimental Physics, Moscow 117259, Russia.
¹³ Fairfield University, Fairfield, Connecticut 06824, USA.
¹⁴ The George Washington University, Washington, D.C. 20052, USA.
¹⁵ Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
¹⁶ Ohio University, Athens, Ohio 45701, USA.
¹⁷ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
¹⁸ Università di Roma Tor Vergata, 00133 Rome, Italy.
¹⁹ Idaho State University, Pocatello, Idaho 83209, USA.
²⁰ INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
²¹ Florida State University, Tallahassee, Florida 32306, USA.
²² Yerevan Physics Institute, 375036 Yerevan, Armenia.
²³ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
²⁴ INFN, Sezione di Torino, 10125 Torino, Italy.
²⁵ Edinburgh University, Edinburgh EH9 3JZ, United Kingdom.
²⁶ University of Richmond, Richmond, Virginia 23173, USA.
²⁷ James Madison University, Harrisonburg, Virginia 22807, USA.
²⁸ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
²⁹ Florida International University, Miami, Florida 33199, USA.
³⁰ University of Connecticut, Storrs, Connecticut 06269, USA.
³¹ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
³² University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³³ Virginia Tech, Blacksburg, Virginia 24061-0435, USA.
³⁴ Temple University, Philadelphia, Pennsylvania 19122, USA.
³⁵ University of Virginia, Charlottesville, Virginia 22901, USA.
³⁶ Norfolk State University, Norfolk, Virginia 23504, USA.
³⁷ Catholic University of America, Washington, D.C. 20064, USA.
³⁸ California State University, Dominguez Hills, Carson, California 90747, USA.
³⁹ Canisius College, Buffalo, New York 14208, USA.

PMID: 26636848
DOI: 10.1103/PhysRevLett.115.212003

Abstract

Unpolarized and beam-polarized fourfold cross sections (d^{4}σ/dQ^{2}dx_{B}dtdϕ) for the ep→e^{'}p^{'}γ reaction were measured using the CLAS detector and the 5.75-GeV polarized electron beam of the Jefferson Lab accelerator, for 110 (Q^{2},x_{B},t) bins over the widest phase space ever explored in the valence-quark region. Several models of generalized parton distributions (GPDs) describe the data well at most of our kinematics. This increases our confidence that we understand the GPD H, expected to be the dominant contributor to these observables. Through a leading-twist extraction of Compton form factors, these results support the model predictions of a larger nucleon size at lower quark-momentum fraction x_{B}.

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Cross Sections for the Exclusive Photon Electroproduction on the Proton and Generalized Parton Distributions

Affiliations

Cross Sections for the Exclusive Photon Electroproduction on the Proton and Generalized Parton Distributions

Authors

Affiliations

Abstract