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First Measurement of Deeply Virtual Compton Scattering on the Neutron with Detection of the Active Neutron

https://doi.org/10.1103/PhysRevLett.133.211903

Hobart, A ; Niccolai, S ; Čuić, M ; Kumerički, K ; Achenbach, P ; Alvarado, J S ; Armstrong, W R ; Atac, H ; Avakian, H ; Baashen, L ; et al ( November 2024 , Physical Review Letters)

Measuring deeply virtual Compton scattering (DVCS) on the neutron is one of the necessary steps to understand the structure of the nucleon in terms of generalized parton distributions (GPDs). Neutron targets play a complementary role to transversely polarized proton targets in the determination of the GPD $E$ . This poorly known and poorly constrained GPD is essential to obtain the contribution of the quarks’ angular momentum to the spin of the nucleon. DVCS on the neutron was measured for the first time selecting the exclusive final state by detecting the neutron, using the Jefferson Lab longitudinally polarized electron beam, with energies up to 10.6 GeV, and the CLAS12 detector. The extracted beam-spin asymmetries, combined with DVCS observables measured on the proton, allow a clean quark-flavor separation of the imaginary parts of the Compton form factors $H$ and $E$ .
Published by the American Physical Society2024
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Free, publicly-accessible full text available November 1, 2025
Strong interaction physics at the luminosity frontier with 22 GeV electrons at Jefferson Lab

https://doi.org/10.1140/epja/s10050-024-01282-x

Accardi, A ; Achenbach, P ; Adhikari, D ; Afanasev, A ; Akondi, C S ; Akopov, N ; Albaladejo, M ; Albataineh, H ; Albrecht, M ; Almeida-Zamora, B ; et al ( September 2024 , The European Physical Journal A)

Free, publicly-accessible full text available September 1, 2025
Measurement of the helicity asymmetry $${\mathbb {E}}$$ for the $$\vec {\gamma }\vec {p} \rightarrow p \pi ^0$$ reaction in the resonance region: The CLAS Collaboration

https://doi.org/10.1140/epja/s10050-023-01123-3

Kim, C. W. ; Zachariou, N. ; Bashkanov, M. ; Briscoe, W. J. ; Fegan, S. ; Kashevarov, V. L. ; Nikonov, K. ; Sarantsev, A. ; Schmidt, A. ; Strakovsky, I. I. ; et al ( September 2023 , The European Physical Journal A)

The double-spin-polarization observable E for γ p → pπ0 has been measured with the CEBAF Large Acceptance Spectrometer (CLAS) at photon beam energies Eγ from 0.367 to 2.173 GeV (corresponding to center-ofmass energies from 1.240 to 2.200 GeV) for pion center-ofmass angles, cos θc.m. π0 , between − 0.86 and 0.82. These new CLAS measurements cover a broader energy range and have smaller uncertainties compared to previous CBELSA data and provide an important independent check on systematics. These measurements are compared to predictions as well as new global fits from The George Washington University, Mainz, and Bonn-Gatchina groups. Their inclusion in multipole analyses will allow us to refine our understanding of the single-pion production contribution to the Gerasimov-Drell- Hearn sum rule and improve the determination of resonance properties, which will be presented in a future publication.
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First Measurement of Hard Exclusive π−Δ++ Electroproduction Beam-Spin Asymmetries off the Proton

https://doi.org/10.1103/PhysRevLett.131.021901

Diehl, S. ; Trotta, N. ; Joo, K. ; Achenbach, P. ; Akbar, Z. ; Armstrong, W. R. ; Atac, H. ; Avakian, H. ; Baashen, L. ; Baltzell, N. A. ; et al ( July 2023 , Physical Review Letters)

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Observation of large missing-momentum (e,e′p) cross-section scaling and the onset of correlated-pair dominance in nuclei

https://doi.org/10.1103/PhysRevC.107.L061301

Korover, I. ; Denniston, A. W. ; Kiral, A. ; Schmidt, A. ; Lovato, A. ; Rocco, N. ; Nikolakopoulos, A. ; Weinstein, L. B. ; Piasetzky, E. ; Hen, O. ; et al ( June 2023 , Physical Review C)

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First Measurement of Λ Electroproduction off Nuclei in the Current and Target Fragmentation Regions

https://doi.org/10.1103/PhysRevLett.130.142301

Chetry, T. ; El Fassi, L. ; Brooks, W. K. ; Dupré, R. ; El Alaoui, A. ; Hafidi, K. ; Achenbach, P. ; Adhikari, K. P. ; Akbar, Z. ; Armstrong, W. R. ; et al ( April 2023 , Physical Review Letters)
First CLAS12 Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries in the Extended Valence Region

https://doi.org/10.1103/PhysRevLett.130.211902

Christiaens, G. ; Defurne, M. ; Sokhan, D. ; Achenbach, P. ; Akbar, Z. ; Amaryan, M. J. ; Atac, H. ; Avakian, H. ; Gayoso, C. Ayerbe ; Baashen, L. ; et al ( May 2023 , Physical Review Letters)

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Exclusive π− electroproduction off the neutron in deuterium in the resonance region

https://doi.org/10.1103/PhysRevC.107.015201

Tian, Y. ; Gothe, R. W. ; Mokeev, V. I. ; Hollis, G. ; Amaryan, M. J. ; Armstrong, W. R. ; Atac, H. ; Avakian, H. ; Barion, L. ; Battaglieri, M. ; et al ( January 2023 , Physical Review C)

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Observation of Correlations between Spin and Transverse Momenta in Back-to-Back Dihadron Production at CLAS12

https://doi.org/10.1103/PhysRevLett.130.022501

Avakian, H. ; Hayward, T. B. ; Kotzinian, A. ; Armstrong, W. R. ; Atac, H. ; Ayerbe Gayoso, C. ; Baashen, L. ; Baltzell, N. A. ; Barion, L. ; Bashkanov, M. ; et al ( January 2023 , Physical Review Letters)

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Observation of Azimuth-Dependent Suppression of Hadron Pairs in Electron Scattering off Nuclei

https://doi.org/10.1103/PhysRevLett.129.182501

Paul, S. J. ; Morán, S. ; Arratia, M. ; El Alaoui, A. ; Hakobyan, H. ; Brooks, W. ; Amaryan, M. J. ; Armstrong, W. R. ; Atac, H. ; Baashen, L. ; et al ( October 2022 , Physical Review Letters)

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