Measurement of spin-density matrix elements in Δ++(1232) photoproduction
Publication
, Journal Article
Afzal, F; Akondi, CS; Albrecht, M; Amaryan, M; Arrigo, S; Arroyave, V; Asaturyan, A; Austregesilo, A; Baldwin, Z; Barbosa, F; Barlow, J; Li, H ...
Published in: Physics Letters Section B Nuclear Elementary Particle and High Energy Physics
April 1, 2025
We measure the spin-density matrix elements (SDMEs) of the Δ++(1232) in the photoproduction reaction γp→π−Δ++(1232) with the GlueX experiment in Hall D at Jefferson Lab. The measurement uses a linearly–polarized photon beam with energies from 8.2 to 8.8 GeV and the statistical precision of the SDMEs exceeds the previous measurement by three orders of magnitude for the momentum transfer squared region below 1.4 GeV2. The data are sensitive to the previously undetermined relative sign between couplings in existing Regge-exchange models. Linear combinations of the extracted SDMEs allow for a decomposition into natural and unnatural–exchange amplitudes. We find that the unnatural exchange plays an important role in the low momentum transfer region.
Duke Scholars
Published In
Physics Letters Section B Nuclear Elementary Particle and High Energy Physics
DOI
ISSN
0370-2693
Publication Date
April 1, 2025
Volume
863
Related Subject Headings
- Nuclear & Particles Physics
- 51 Physical sciences
- 49 Mathematical sciences
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
- 0201 Astronomical and Space Sciences
- 0105 Mathematical Physics
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Afzal, F., Akondi, C. S., Albrecht, M., Amaryan, M., Arrigo, S., Arroyave, V., … Ostrovidov, A. I. (2025). Measurement of spin-density matrix elements in Δ++(1232) photoproduction. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 863. https://doi.org/10.1016/j.physletb.2025.139368
Afzal, F., C. S. Akondi, M. Albrecht, M. Amaryan, S. Arrigo, V. Arroyave, A. Asaturyan, et al. “Measurement of spin-density matrix elements in Δ++(1232) photoproduction.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 863 (April 1, 2025). https://doi.org/10.1016/j.physletb.2025.139368.
Afzal F, Akondi CS, Albrecht M, Amaryan M, Arrigo S, Arroyave V, et al. Measurement of spin-density matrix elements in Δ++(1232) photoproduction. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2025 Apr 1;863.
Afzal, F., et al. “Measurement of spin-density matrix elements in Δ++(1232) photoproduction.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, vol. 863, Apr. 2025. Scopus, doi:10.1016/j.physletb.2025.139368.
Afzal F, Akondi CS, Albrecht M, Amaryan M, Arrigo S, Arroyave V, Asaturyan A, Austregesilo A, Baldwin Z, Barbosa F, Barlow J, Barriga E, Barsotti R, Barton D, Baturin V, Berdnikov VV, Black T, Boeglin W, Boer M, Briscoe WJ, Britton T, Cao S, Chudakov E, Chung G, Cole PL, Cortes O, Crede V, Dalton MM, Darulis D, Deur A, Dobbs S, Dolgolenko A, Dugger M, Dzhygadlo R, Ebersole D, Edo M, Egiyan H, Erbora T, Eugenio P, Fabrizi A, Fanelli C, Fang S, Fitches J, Foda AM, Furletov S, Gan L, Gao H, Gardner A, Gasparian A, Glazier DI, Gleason C, Goryachev VS, Grube B, Guo J, Guo L, Hernandez J, Hernandez K, Hoffman ND, Hornidge D, Hou G, Hurck P, Hurley A, Imoehl W, Ireland DG, Ito MM, Jaegle I, Jarvis NS, Jeske T, Jing M, Jones RT, Kakoyan V, Kalicy G, Khachatryan V, Kourkoumelis C, LaDuke A, Larin I, Lawrence D, Lersch DI, Li H, Liu B, Livingston K, Lolos GJ, Lorenti L, Lyubovitskij V, Ma R, Mack D, Mahmood A, Marukyan H, Matveev V, McCaughan M, McCracken M, Meyer CA, Miskimen R, Mitchell RE, Mizutani K, Neelamana V, Ng L, Nissen E, Orešić S, Ostrovidov AI. Measurement of spin-density matrix elements in Δ++(1232) photoproduction. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2025 Apr 1;863.
Published In
Physics Letters Section B Nuclear Elementary Particle and High Energy Physics
DOI
ISSN
0370-2693
Publication Date
April 1, 2025
Volume
863
Related Subject Headings
- Nuclear & Particles Physics
- 51 Physical sciences
- 49 Mathematical sciences
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
- 0201 Astronomical and Space Sciences
- 0105 Mathematical Physics