Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering
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,...
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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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 work, we report the first beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton scattering (DVCS) 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 (\(\phi\)) 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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AbstractList | Phys. Rev. Lett. 123, 032502 (2019) 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 work, we report the first
beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton
scattering (DVCS) 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 ($\phi$) 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. 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 work, we report the first beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton scattering (DVCS) 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 (\(\phi\)) 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. |
Author | Hicks, K Ireland, D G Mineeva, T est, T A Zhao, Z W Girod, F X Weinstein, L B Adhikari, S Dupré, R Markov, N Gevorgyan, N Gavalian, G Kubarovsky, V Harrison, N Khanal, A Pasyuk, E Garçon, M Kuhn, S E Hayward, T B Isupov, E L Fegan, S Pappalardo, L L Bossù, F Cole, P L Holtrop, M Torayev, B Heddle, D Battaglieri, M Hattawy, M Meziani, Z E Crede, V C Munoz Camacho Bedlinskiy, I Guidal, M Gothe, R W Voskanyan, H C Ayerbe Gayoso Dashyan, N Tyler, N Gilfoyle, G P Wood, M H Hauenstein, F Mayer, M Salgado, C Lanza, L Tan, J A Keller, D Wang, R Jenkins, D Griffioen, K A Niccolai, S Celentano, A Carman, D S Perrin, Y Strauch, S Ilieva, Y Djalali, C MacGregor, I J D Voutier, E Angelini, Giovanni Defurne, M Lenisa, P Sabatié, F Golovatch, E Wei, X Rizzo, A Rosner, G Zhang, J Poudel, J Sparveris, N Fradi, A Khachatryan, M Taiuti, M Kabir, M L Riser, D Marchand, D Clark, L Khachatryan, G McKinnon, B Ungaro, M Khandaker, M Livingston, K Kim, C W Mirazita, M Baltzell, N A Ciullo, G Soto, O Watts, D P Kim, W Sharabian, Y G Pogorelko, O Egiyan, H Deur, A Klein, F J Biselli, A S Chatagnon, P Conta |
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BackLink | https://doi.org/10.1103/PhysRevLett.123.032502$$DView published paper (Access to full text may be restricted) https://doi.org/10.48550/arXiv.1812.07628$$DView paper in arXiv |
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Snippet | 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... Phys. Rev. Lett. 123, 032502 (2019) In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge... |
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SubjectTerms | Dependence Elastic scattering Electron beams Kinematics Nucleons Physics - High Energy Physics - Experiment Physics - Nuclear Experiment Protons Quarks |
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Title | Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering |
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