Measurement of Spin-Density Matrix Elements in $\Delta^{++}(1232)$ photoproduction
Nuclear Experiment
2024-07-29 v2
Abstract
We measure the spin-density matrix elements (SDMEs) of the in the photoproduction reaction with the GlueX experiment in Hall D at Jefferson Lab. The measurement uses a linearly--polarized photon beam with energies from to ~GeV and the statistical precision of the SDMEs exceeds the previous measurement by three orders of magnitude for the momentum transfer squared region below GeV. 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.
Keywords
Cite
@article{arxiv.2406.12829,
title = {Measurement of Spin-Density Matrix Elements in $\Delta^{++}(1232)$ photoproduction},
author = {F. Afzal and C. S. Akondi and M. Albrecht and M. Amaryan and S. Arrigo and V. Arroyave and A. Asaturyan and A. Austregesilo and Z. Baldwin and F. Barbosa and J. Barlow and E. Barriga and R. Barsotti and D. Barton and V. Baturin and V. V. Berdnikov and T. Black and W. Boeglin and M. Boer and W. J. Briscoe and T. Britton and S. Cao and E. Chudakov and G. Chung and P. L. Cole and O. Cortes and V. Crede and M. M. Dalton and D. Darulis and A. Deur and S. Dobbs and A. Dolgolenko and M. Dugger and R. Dzhygadlo and D. Ebersole and M. Edo and H. Egiyan and T. Erbora and P. Eugenio and A. Fabrizi and C. Fanelli and S. Fang and J. Fitches and A. M. Foda and S. Furletov and L. Gan and H. Gao and A. Gardner and A. Gasparian and D. I. Glazier and C. Gleason and V. S. Goryachev and B. Grube and J. Guo and L. Guo and J. Hernandez and K. Hernandez and N. D. Hoffman and D. Hornidge and G. Hou and P. Hurck and A. Hurley and W. Imoehl and D. G. Ireland and M. M. Ito and I. Jaegle and N. S. Jarvis and T. Jeske and M. Jing and R. T. Jones and V. Kakoyan and G. Kalicy and V. Khachatryan and C. Kourkoumelis and A. LaDuke and I. Larin and D. Lawrence and D. I. Lersch and H. Li and B. Liu and K. Livingston and G. J. Lolos and L. Lorenti and V. Lyubovitskij and R. Ma and D. Mack and A. Mahmood and H. Marukyan and V. Matveev and M. McCaughan and M. McCracken and C. A. Meyer and R. Miskimen and R. E. Mitchell and K. Mizutani and V. Neelamana and L. Ng and E. Nissen and S. Orešić and A. I. Ostrovidov and Z. Papandreou and C. Paudel and R. Pedroni and L. Pentchev and K. J. Peters and E. Prather and S. Rakshit and J. Reinhold and A. Remington and B. G. Ritchie and J. Ritman and G. Rodriguez and D. Romanov and K. Saldana and C. Salgado and S. Schadmand and A. M. Schertz and K. Scheuer and A. Schick and A. Schmidt and R. A. Schumacher and J. Schwiening and N. Septian and P. Sharp and X. Shen and M. R. Shepherd and J. Sikes and A. Smith and E. S. Smith and D. I. Sober and A. Somov and S. Somov and J. R. Stevens and I. I. Strakovsky and B. Sumner and K. Suresh and V. V. Tarasov and S. Taylor and A. Teymurazyan and A. Thiel and T. Viducic and T. Whitlatch and N. Wickramaarachchi and Y. Wunderlich and B. Yu and J. Zarling and Z. Zhang and X. Zhou and B. Zihlmann},
journal= {arXiv preprint arXiv:2406.12829},
year = {2024}
}