Measurement of spin-density matrix elements in Δ++(1232) photoproduction
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.
Authors
- A. Thiel (ORCID: https://orcid.org/0000-0003-0753-696X)
- K. Saldana (ORCID: https://orcid.org/0000-0002-6161-0967)
- J. R. Stevens (ORCID: https://orcid.org/0000-0002-0816-200X)
- D. Ebersole (ORCID: https://orcid.org/0000-0001-9002-7917)
- R. A. Schumacher
- V. Khachatryan (ORCID: https://orcid.org/0000-0003-2567-2930)
- T. Erbora (ORCID: https://orcid.org/0000-0001-7266-1682)
- T. Black (ORCID: https://orcid.org/0000-0002-5460-6548)
- C. S. Akondi (ORCID: https://orcid.org/0000-0001-6303-5217)
- W. Imoehl (ORCID: https://orcid.org/0000-0002-1554-1016)
- V. Arroyave
- N. Septian (ORCID: https://orcid.org/0009-0003-5282-540X)
- C. Paudel (ORCID: https://orcid.org/0000-0003-3801-1648)
- Valery E. Lyubovitskij (ORCID: https://orcid.org/0000-0001-7467-572X)
- M. Albrecht (ORCID: https://orcid.org/0000-0001-6180-4297)
- A. Teymurazyan
- T. Jeske
- A. Mahmood
- C. Salgado (ORCID: https://orcid.org/0000-0002-6860-2169)
- Zachary Baldwin (ORCID: https://orcid.org/0000-0002-8534-0922)
- В. В. Бердников (ORCID: https://orcid.org/0000-0003-1603-4320)
- G. Rodriguez (ORCID: https://orcid.org/0000-0002-1443-0277)
- A. Fabrizi
- I. Jaeglé (ORCID: https://orcid.org/0000-0001-7767-3420)
- T. Whitlatch
- H. Marukyan (ORCID: https://orcid.org/0000-0002-4150-0533)
- P. Eugenio (ORCID: https://orcid.org/0000-0002-0588-0129)
- J. Ritman (ORCID: https://orcid.org/0000-0002-1005-6230)
- L. Gan (ORCID: https://orcid.org/0000-0002-3516-8335)
- L. Ng (ORCID: https://orcid.org/0000-0002-3468-8558)
- S. Furletov (ORCID: https://orcid.org/0000-0002-7178-8929)
- A. Schick
- J. Reinhold (ORCID: https://orcid.org/0000-0001-5876-9654)
- B. Liu (ORCID: https://orcid.org/0000-0001-9664-5230)
- M. Boër (ORCID: https://orcid.org/0000-0001-9157-4349)
- В. В. Тарасов (ORCID: https://orcid.org/0000-0002-5101-3392)
- I. Larin (ORCID: https://orcid.org/0000-0001-5059-2129)
- A. Hurley
- J. Barlow (ORCID: https://orcid.org/0000-0003-0865-0529)
- A. Gasparian
- H. Gao (ORCID: https://orcid.org/0000-0002-9669-3088)
- M. J. Amaryan (ORCID: https://orcid.org/0000-0002-5648-0256)
- K. Scheuer (ORCID: https://orcid.org/0009-0000-4604-9617)
- M. R. Shepherd (ORCID: https://orcid.org/0000-0002-5327-5927)
- C. Fanelli (ORCID: https://orcid.org/0000-0002-1985-1329)
- G. Kalicy (ORCID: https://orcid.org/0000-0003-0356-5632)
- J. Zarling (ORCID: https://orcid.org/0000-0002-7791-0585)
- L. Pentchev (ORCID: https://orcid.org/0000-0001-5624-3106)
- M. M. Ito (ORCID: https://orcid.org/0000-0002-8269-264X)
- W. Boeglin (ORCID: https://orcid.org/0000-0001-9932-9161)
- F. Barbosa
- G. J. Lolos
- K. Livingston
- A. M. Foda (ORCID: https://orcid.org/0000-0002-4904-2661)
- D. I. Lersch (ORCID: https://orcid.org/0000-0002-0356-0754)
- J. Fitches
- E. Nissen
- A. Gardner
- D. J. Lawrence (ORCID: https://orcid.org/0000-0002-7696-6667)
- B. Sumner
- D. G. Ireland (ORCID: https://orcid.org/0000-0001-7713-7011)
- A. LaDuke (ORCID: https://orcid.org/0009-0000-8697-3556)
- V. Neelamana (ORCID: https://orcid.org/0000-0003-4907-1881)
- A. Remington (ORCID: https://orcid.org/0009-0009-4959-048X)
- T. Britton (ORCID: https://orcid.org/0000-0002-3244-041X)
- S. Schadmand (ORCID: https://orcid.org/0000-0002-3069-8759)
- V. Matveev (ORCID: https://orcid.org/0000-0002-9431-905X)
- E. Prather
- P. L. Cole (ORCID: https://orcid.org/0000-0003-0487-0647)
- L. Lorenti
- S. Rakshit (ORCID: https://orcid.org/0009-0001-6820-8196)
- I. I. Strakovsky (ORCID: https://orcid.org/0000-0001-8586-9482)
- R. T. Jones (ORCID: https://orcid.org/0000-0002-1410-6012)
- S. Taylor (ORCID: https://orcid.org/0009-0005-2542-9000)
- R. E. Mitchell (ORCID: https://orcid.org/0000-0003-2248-4109)
- R. Dzhygadlo
- G. Hou
- A. M. Schertz (ORCID: https://orcid.org/0000-0002-6805-4721)
- C. Gleason (ORCID: https://orcid.org/0000-0002-4713-8969)
- V. Goryachev (ORCID: https://orcid.org/0009-0003-0167-1367)
- E. Chudakov (ORCID: https://orcid.org/0000-0002-0255-8548)
- Nathaniel Hoffman (ORCID: https://orcid.org/0000-0002-8865-2286)
- J. Guo (ORCID: https://orcid.org/0000-0003-2936-0088)
- M. M. Dalton
- K. J. Peters
- E. S. Smith (ORCID: https://orcid.org/0000-0001-5912-9026)
- Y. Wunderlich (ORCID: https://orcid.org/0000-0001-7534-4527)
- F. Afzal (ORCID: https://orcid.org/0000-0001-8063-6719)
- A. Schmidt (ORCID: https://orcid.org/0000-0003-2711-8984)
- M. Dugger (ORCID: https://orcid.org/0000-0001-5927-7045)
- S. Dobbs (ORCID: https://orcid.org/0000-0001-5688-1968)
- N. Wickramaarachchi (ORCID: https://orcid.org/0000-0002-7109-4097)
- B. G. Ritchie (ORCID: https://orcid.org/0000-0002-1705-5150)
- E. Barriga (ORCID: https://orcid.org/0000-0003-3415-617X)
- K. Suresh
- A. Ostrovidov (ORCID: https://orcid.org/0000-0001-6415-6061)
- K. Mizutani (ORCID: https://orcid.org/0009-0003-0800-441X)
- D. Darulis (ORCID: https://orcid.org/0000-0001-7060-9522)
- M. McCaughan (ORCID: https://orcid.org/0000-0003-2649-3950)
- R. Barsotti
- V. Baturin
- W. J. Briscoe (ORCID: https://orcid.org/0000-0001-5899-7622)
- N. S. Jarvis (ORCID: https://orcid.org/0000-0002-3565-7585)
- A. Dolgolenko (ORCID: https://orcid.org/0000-0002-9386-2165)
- T. Viducic (ORCID: https://orcid.org/0009-0003-5562-6465)
- J. Hernandez (ORCID: https://orcid.org/0000-0002-6048-3986)
- B. Zihlmann (ORCID: https://orcid.org/0009-0000-2342-9684)
- A. Asaturyan (ORCID: https://orcid.org/0000-0002-8105-913X)
- D. I. Glazier (ORCID: https://orcid.org/0000-0002-8929-6332)
- H. Egiyan (ORCID: https://orcid.org/0000-0002-5881-3616)
- C. A. Meyer (ORCID: https://orcid.org/0000-0001-7599-3973)
- R. Pedroni (ORCID: https://orcid.org/0000-0001-9377-1370)
- R. Miskimen (ORCID: https://orcid.org/0009-0002-4021-5201)
- M. Edo
- J. Sikes
- S. Arrigo
- Zhenyu Zhang (ORCID: https://orcid.org/0000-0002-5942-0355)
- P. Sharp (ORCID: https://orcid.org/0000-0001-7532-3152)
- V. Kakoyan (ORCID: https://orcid.org/0000-0001-7422-7521)
- X. Y. Shen (ORCID: https://orcid.org/0000-0002-6087-5517)
- M. Q. Jing (ORCID: https://orcid.org/0000-0003-3769-0431)
- Xiang Zhou (ORCID: https://orcid.org/0000-0002-6908-683X)
- D. Romanov (ORCID: https://orcid.org/0000-0001-6826-2291)
- P. Hurck (ORCID: https://orcid.org/0000-0002-8473-1470)
- Andrew Smith (ORCID: https://orcid.org/0000-0002-9193-2617)
- C. Kourkoumelis (ORCID: https://orcid.org/0000-0003-0083-274X)
- S. Cao (ORCID: https://orcid.org/0009-0000-2458-8636)
- M. McCracken
- D. I. Sober
- Z. Papandreou (ORCID: https://orcid.org/0000-0002-5592-8135)
- Lincheng Guo
- H. Li (ORCID: https://orcid.org/0009-0004-0118-8874)
- B. Grube (ORCID: https://orcid.org/0000-0001-8473-0454)
- A. Austregesilo (ORCID: https://orcid.org/0000-0002-9291-4429)
- V. Credé
- O. Cortes
- R. Ma (ORCID: https://orcid.org/0000-0003-2291-6987)
- A. Somov (ORCID: https://orcid.org/0000-0002-7639-331X)
- D. Hornidge (ORCID: https://orcid.org/0000-0001-6895-5338)
- D. S. Barton (ORCID: https://orcid.org/0009-0007-5646-2473)
- S. S. Fang (ORCID: https://orcid.org/0000-0001-5731-4113)
- Boxiang Yu (ORCID: https://orcid.org/0000-0003-3420-2527)
- S. Somov (ORCID: https://orcid.org/0000-0003-2966-9333)
- D. Mack
- A. Deur (ORCID: https://orcid.org/0000-0002-2203-7723)
- Git Chung
- K. Hernandez
- S. Orešić
- J. Schwiening (ORCID: https://orcid.org/0000-0003-2670-1553)
Institutions
- University of Bonn (DE)
- Campbell Collaboration (NO)
Publication Details
- Journal
- Physics Letters B
- Published
- 2025-02-28
- DOI
- https://doi.org/10.1016/j.physletb.2025.139368
- Citations
- 1
- Primary Topic
- Quantum Chromodynamics and Particle Interactions
- Type
- article
- Field-Weighted Citation Impact
- 1.87