Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering

M Hattawy^{1

2

3}, N A Baltzell^{1

3

4}, R Dupré^{1

2}, S Bültmann³, R De Vita⁵, A El Alaoui^{1

6}, L El Fassi^{1

7}, H Egiyan⁴, F X Girod⁴, M Guidal², K Hafidi¹, D Jenkins⁸, S Liuti⁹, Y Perrin¹⁰, S Stepanyan⁴, B Torayev³, E Voutier^{2

10}, S Adhikari¹¹, Giovanni Angelini¹², C Ayerbe Gayoso¹³, L Barion¹⁴, M Battaglieri⁵, I Bedlinskiy¹⁵, A S Biselli¹⁶, F Bossù¹⁷, W Brooks⁶, F Cao¹⁸, D S Carman⁴, A Celentano⁵, P Chatagnon², T Chetry¹⁹, G Ciullo^{20

14}, L Clark²¹, P L Cole^{22

23}, M Contalbrigo¹⁴, V Crede²⁴, A D'Angelo^{25

26}, N Dashyan²⁷, E De Sanctis²⁸, M Defurne¹⁷, A Deur⁴, S Diehl¹⁸, C Djalali^{19

29}, M Ehrhart², P Eugenio²⁴, S Fegan²¹, A Filippi³⁰, T A Forest²², A Fradi², M Garçon¹⁷, G Gavalian^{3

4}, N Gevorgyan²⁷, G P Gilfoyle³¹, K L Giovanetti³², E Golovatch³³, R W Gothe²⁹, K A Griffioen¹³, N Harrison⁴, F Hauenstein³, T B Hayward¹³, D Heddle^{34

4}, K Hicks¹⁹, M Holtrop³⁵, Y Ilieva²⁹, D G Ireland²¹, E L Isupov³³, H S Jo³⁶, S Johnston¹, D Keller^{19

9}, G Khachatryan²⁷, M Khachatryan³, A Khanal¹¹, M Khandaker³⁷, C W Kim¹², W Kim³⁶, F J Klein³⁸, V Kubarovsky⁴, S E Kuhn³, L Lanza²⁵, M L Kabir⁷, P Lenisa¹⁴, K Livingston²¹, I J D MacGregor²¹, D Marchand², N Markov¹⁸, M Mayer³, B McKinnon²¹, Z E Meziani³⁹, T Mineeva⁶, M Mirazita²⁸, R A Montgomery²¹, C Munoz Camacho², P Nadel-Turonski^{38

4}, S Niccolai², A I Ostrovidov²⁴, L L Pappalardo¹⁴, R Paremuzyan^{35

27}, E Pasyuk^{40

4}, O Pogorelko¹⁵, J Poudel³, Y Prok^{3

9}, D Protopopescu²¹, M Ripani⁵, D Riser¹⁸, A Rizzo^{25

26}, G Rosner²¹, P Rossi^{28

4}, F Sabatié¹⁷, C Salgado³⁷, R A Schumacher⁴¹, Y G Sharabian⁴, Iu Skorodumina^{33

29}, D Sokhan²¹, O Soto⁶, N Sparveris³⁹, S Strauch²⁹, M Taiuti⁴², J A Tan³⁶, N Tyler²⁹, M Ungaro^{18

4}, H Voskanyan²⁷, R Wang², D P Watts⁴³, X Wei⁴, L B Weinstein³, M H Wood⁴⁴, N Zachariou⁴³, J Zhang^{3

9}, Z W Zhao^{45

29}; CLAS Collaboration

Affiliations

¹ Argonne National Laboratory, Argonne, Illinois 60439, USA.
² Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France.
³ Old Dominion University, Norfolk, Virginia 23529, USA.
⁴ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁵ INFN, Sezione di Genova, 16146 Genova, Italy.
⁶ Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
⁷ Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
⁸ Virginia Tech, Blacksburg, Virginia 24061-0435, USA.
⁹ University of Virginia, Charlottesville, Virginia 22901, USA.
¹⁰ LPSC, Université Grenoble-Alpes, CNRS/IN2P3, 38026 Grenoble, France.
¹¹ Florida International University, Miami, Florida 33199, USA.
¹² The George Washington University, Washington, DC 20052, USA.
¹³ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
¹⁴ INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
¹⁵ Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia.
¹⁶ Fairfield University, Fairfield Connecticut 06824, USA.
¹⁷ IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
¹⁸ University of Connecticut, Storrs, Connecticut 06269, USA.
¹⁹ Ohio University, Athens, Ohio 45701, USA.
²⁰ Universita' di Ferrara, 44121 Ferrara, Italy.
²¹ University of Glasgow, Glasgow G12 8QQ, United Kingdom.
²² Idaho State University, Pocatello, Idaho 83209, USA.
²³ Lamar University, 4400 MLK Boulevard, P.O. Box 10009, Beaumont, Texas 77710, USA.
²⁴ Florida State University, Tallahassee, Florida 32306, USA.
²⁵ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
²⁶ Universita' di Roma Tor Vergata, 00133 Rome, Italy.
²⁷ Yerevan Physics Institute, 375036 Yerevan, Armenia.
²⁸ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
²⁹ University of South Carolina, Columbia, South Carolina 29208, USA.
³⁰ INFN, Sezione di Torino, 10125 Torino, Italy.
³¹ University of Richmond, Richmond, Virginia 23173, USA.
³² James Madison University, Harrisonburg, Virginia 22807, USA.
³³ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
³⁴ Christopher Newport University, Newport News, Virginia 23606, USA.
³⁵ University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³⁶ Kyungpook National University, Daegu 41566, Republic of Korea.
³⁷ Norfolk State University, Norfolk, Virginia 23504, USA.
³⁸ Catholic University of America, Washington, DC 20064, USA.
³⁹ Temple University, Philadelphia, Pennsylvania 19122, USA.
⁴⁰ Arizona State University, Tempe, Arizona 85287-1504, USA.
⁴¹ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
⁴² Universitá di Genova, 16146 Genova, Italy.
⁴³ University of York, York YO10 5DD, United Kingdom.
⁴⁴ Canisius College, Buffalo, New York, USA.
⁴⁵ Duke University, Durham, North Carolina 27708-0305, USA.

PMID: 31386486
DOI: 10.1103/PhysRevLett.123.032502

Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering

M Hattawy et al. Phys Rev Lett. 2019.

. 2019 Jul 19;123(3):032502.

doi: 10.1103/PhysRevLett.123.032502.

Authors

Affiliations

¹ Argonne National Laboratory, Argonne, Illinois 60439, USA.
² Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France.
³ Old Dominion University, Norfolk, Virginia 23529, USA.
⁴ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁵ INFN, Sezione di Genova, 16146 Genova, Italy.
⁶ Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
⁷ Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
⁸ Virginia Tech, Blacksburg, Virginia 24061-0435, USA.
⁹ University of Virginia, Charlottesville, Virginia 22901, USA.
¹⁰ LPSC, Université Grenoble-Alpes, CNRS/IN2P3, 38026 Grenoble, France.
¹¹ Florida International University, Miami, Florida 33199, USA.
¹² The George Washington University, Washington, DC 20052, USA.
¹³ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
¹⁴ INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
¹⁵ Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia.
¹⁶ Fairfield University, Fairfield Connecticut 06824, USA.
¹⁷ IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
¹⁸ University of Connecticut, Storrs, Connecticut 06269, USA.
¹⁹ Ohio University, Athens, Ohio 45701, USA.
²⁰ Universita' di Ferrara, 44121 Ferrara, Italy.
²¹ University of Glasgow, Glasgow G12 8QQ, United Kingdom.
²² Idaho State University, Pocatello, Idaho 83209, USA.
²³ Lamar University, 4400 MLK Boulevard, P.O. Box 10009, Beaumont, Texas 77710, USA.
²⁴ Florida State University, Tallahassee, Florida 32306, USA.
²⁵ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
²⁶ Universita' di Roma Tor Vergata, 00133 Rome, Italy.
²⁷ Yerevan Physics Institute, 375036 Yerevan, Armenia.
²⁸ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
²⁹ University of South Carolina, Columbia, South Carolina 29208, USA.
³⁰ INFN, Sezione di Torino, 10125 Torino, Italy.
³¹ University of Richmond, Richmond, Virginia 23173, USA.
³² James Madison University, Harrisonburg, Virginia 22807, USA.
³³ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
³⁴ Christopher Newport University, Newport News, Virginia 23606, USA.
³⁵ University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³⁶ Kyungpook National University, Daegu 41566, Republic of Korea.
³⁷ Norfolk State University, Norfolk, Virginia 23504, USA.
³⁸ Catholic University of America, Washington, DC 20064, USA.
³⁹ Temple University, Philadelphia, Pennsylvania 19122, USA.
⁴⁰ Arizona State University, Tempe, Arizona 85287-1504, USA.
⁴¹ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
⁴² Universitá di Genova, 16146 Genova, Italy.
⁴³ University of York, York YO10 5DD, United Kingdom.
⁴⁴ Canisius College, Buffalo, New York, USA.
⁴⁵ Duke University, Durham, North Carolina 27708-0305, USA.

PMID: 31386486
DOI: 10.1103/PhysRevLett.123.032502

Abstract

In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal momentum of quarks inside the nucleon. Meanwhile, the structure of bound nucleons in nuclei has been studied in inclusive deep-inelastic lepton scattering experiments off nuclear targets, showing a significant difference in longitudinal momentum distribution of quarks inside the bound nucleon, known as the EMC effect. In this Letter, we report the first beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton scattering off a proton bound in ^{4}He. The data used here were accumulated using a 6 GeV longitudinally polarized electron beam incident on a pressurized ^{4}He gaseous target placed within the CLAS spectrometer in Hall-B at the Thomas Jefferson National Accelerator Facility. The azimuthal angle (ϕ) dependence of the BSA was studied in a wide range of virtual photon and scattered proton kinematics. The Q^{2}, x_{B}, and t dependencies of the BSA on the bound proton are compared with those on the free proton. In the whole kinematical region of our measurements, the BSA on the bound proton is smaller by 20% to 40%, indicating possible medium modification of its partonic structure.

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Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering

Affiliations

Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering

Authors

Affiliations

Abstract