Document Type
Article
Publication Date
2026
DOI
10.1103/d6g9-96xr
Publication Title
Physical Review D
Volume
113
Issue
9
Pages
092019 (Article no.)
Abstract
The polarization of Λ hyperons is preserved in the angular distribution of their decay products. This property allows one to study the spin structure of the Λ. In semi-inclusive deep inelastic scattering where a high energy lepton interacts with a nucleon target and one or more hadrons and the scattered lepton are detected in the final state, the probability for a struck quark to impart the polarization of the lepton to the Λ may be measured. In particular, in electron-proton scattering this quantity may be related to the longitudinal light quark polarization of the Λ. Currently, limited experimental data cannot discriminate between different models of Λ spin structure. This work reports on the measurement of the longitudinal spin transfer D-LLΛ to the Λ using data taken by the CLAS12 spectrometer at Jefferson Lab with a 10.6 GeV longitudinally polarized electron beam and an unpolarized hydrogen target. This measurement is the most precise to date, and, in comparison with theory predictions, it offers valuable insight into the relative dominance of current and target fragmentation in Λ production.
Rights
© 2026 American Physical Society.
Published under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License. Further distribution of this work must maintain attribution to the authors and the published article's title, journal citation, and DOI. Funded by SCOAP³.
Data Availability
Article states: "The data that support the findings of this article are not publicly available because they are owned by a third party and the terms prevent public distribution. The data are available from the authors upon reasonable request."
Original Publication Citation
McEneaney, M., Vossen, A., Acar, A., Achenbach, P., Alvarado, J. S., Amaryan, M., Armstrong, W. R., Atac, H., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bondi, M., Bossù, F., Boiarinov, S., Brinkmann, K. T.,…Collaboration, C. (2026). Longitudinal spin transfer to Λ hyperons in semi-inclusive deep inelastic scattering with the CLAS12 spectrometer. Physical Review D, 113(9), Article 092019. https://doi.org/10.1103/d6g9-96xr
ORCID
0000-0002-5648-0256 (Amaryan), 0009-0009-3736-5832 (Fogler), 0000-0003-2086-2807 (Hattawy)
Repository Citation
McEneaney, M.; Vossen, A.; Acar, A.; Achenbach, P.; Alvarado, J. S.; Amaryan, M.; Armstrong, W. R.; Atac, H.; Baltzell, N. A.; Barion, L.; Bashkanov, M.; Battaglieri, M.; Benmokhtar, F.; Bianconi, A.; Biselli, A. S.; Bondi, M.; Bossù, F.; Boiarinov, S.; Brinkmann, K. -Th.; Briscoe, W. J.; Burkert, V. D.; Cao, T.; Capobianco, R.; Carman, D. S.; Carvajal, J. C.; Celentano, A.; Chatagnon, P.; Chesnokov, V.; Chinchay, H.; Ciullo, G.; Cole, P. L.; Contalbrigo, M.; D'Angelo, A.; Dashyan, N.; De Vita, R.; Defurne, M.; Diehl, S.; Dilks, C.; Djalali, C.; Dupre, R.; Egiyan, H.; Ehrhart, M.; Alaoui, A. El; Fassi, L. El; Farooq, M.; Fegan, S.; Ferguson, R. E.; Fernando, I. P.; Filippi, A.; Fogler, C.; Gates, K.; Gavalian, G.; Glazier, D. I.; Gothe, R. W.; Gotra, Y.; Gualtieri, B.; Hafidi, K.; Hakobyan, H.; Hattawy, M.; Hayward, T. B.; Heddle, D.; Hobart, A.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Jo, H. S.; Joosten, S.; Kageya, T.; Kim, A.; Klimenko, V.; Kripko, A.; Kubarovsky, V.; Lanza, L.; Lee, S.; Lenisa, P.; Marchand, D.; Mascagna, V.; Matamoros, D.; McKinnon, B.; Mineeva, T.; Mirazita, M.; Mokeev, V.; Munoz Camacho, C.; Nadel-Turonski, P.; Nagorna, T.; Neupane, K.; Niccolai, S.; Niculescu, G.; Osipenko, M.; Ouillon, M.; Pandey, P.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Pasyuk, E.; Paul, S. J.; Phelps, W.; Pilleux, N.; Polcher Rafael, S.; Polizzi, L.; Poudel, J.; Prok, Y.; Radic, A.; Reed, T.; Richards, J.; Ripani, M.; Rossi, P.; Rusova, A. A.; Salgado, C.; Schadmand, S.; Schmidt, A.; Scott, M. B. C.; Shirokov, E. V.; Shresstha, S.; Sidoretti, E.; Sokhan, D.; Sparveris, N.; Spreafico, M.; Strakovsky, I.; Strauch, S.; Tan, J. A.; Tyson, R.; Ungaro, M.; Vaishnavi, P. S. H.; Vallarino, S.; Velasquez, C.; Venturelli, L.; Voskanyan, H.; Voutier, E.; Watts, D. P.; Wang, Y.; Weerasinghe, U.; Wei, X.; Wickramaarachchi, N.; Wood, M. H.; Xu, L.; Xu, Z.; Zachariou, N.; Zhao, Z. W.; Ziegler, V.; and Zurek, M., "Longitudinal Spin Transfer to Λ Hyperons in Semi-Inclusive Deep Inelastic Scattering with the CLAS12 Spectrometer" (2026). Physics Faculty Publications. 1062.
https://digitalcommons.odu.edu/physics_fac_pubs/1062